Author: "Micromegas : Nano-Fluidique" - Searchworks@Jio Institute Digital Library Search Results

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33 results on '"Micromegas : Nano-Fluidique"'

1. Unified non-equilibrium simulation methodology for flow through nanoporous carbon membrane

Author: Monet, Geoffrey, Bocquet, Marie-Laure, Bocquet, Lydéric, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), and European Project: 899528 ,ITS-THIN
Subjects: Nanotubes, Condensed Matter - Mesoscale and Nanoscale Physics, Energy harvesting, Desalination, Classical molecular dynamic simulations, FOS: Physical sciences, Condensed Matter - Soft Condensed Matter, 2D materials, [PHYS.PHYS.PHYS-COMP-PH]Physics [physics]/Physics [physics]/Computational Physics [physics.comp-ph], Chemical elements, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Soft Condensed Matter (cond-mat.soft), Electrokinetic phenomena, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Graphene, Electroosmosis, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Nanomaterials
Abstract: The emergence of new nanoporous materials, based e.g. on 2D materials, offers new avenues for water filtration and energy. There is accordingly a need to investigate the molecular mechanisms at the root of the advanced performances of these systems in terms of nanofluidic and ionic transport. In this work, we introduce a novel unified methodology for Non-Equilibrium classical Molecular Dynamic simulations (NEMD), allowing to apply likewise pressure, chemical potential and voltage drops across nanoporous membranes and quantifying the resulting observables characterizing confined liquid transport under such external stimuli. We apply the NEMD methodology to study a new type of synthetic Carbon NanoMembranes (CNM), which have recently shown outstanding performances for desalination, keeping high water permeability while maintaining full salt rejection. The high water permeance of CNM, as measured experimentally, is shown to originate in prominent entrance effects associated with negligible friction inside the nanopore. Beyond, our methodology allows to fully calculate the symmetric transport matrix and the cross-phenomena such as electro-osmosis, diffusio-osmosis, streaming currents, etc. In particular, we predict a large diffusio-osmotic current across the CNM pore under concentration gradient, despite the absence of surface charges. This suggests that CNMs are outstanding candidates as alternative, scalable membranes for osmotic energy harvesting., Comment: 13 pages, 16 figures, submitted to J. Chem Phys
Published: 2023
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2. Singular cotangent models in fluids with dissipation

Author: Baptiste Coquinot, Pau Mir, Eva Miranda, Universitat Politècnica de Catalunya. Doctorat en Física Computacional i Aplicada, Universitat Politècnica de Catalunya. Departament de Matemàtiques, Universitat Politècnica de Catalunya. GEOMVAP - Geometria de Varietats i Aplicacions, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Micromegas : Nano-Fluidique, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Universitat Politècnica de Catalunya [Barcelona] (UPC), Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Lille-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: B-symplectic geometry, Twisted cotangent models, Matemàtiques i estadística [Àrees temàtiques de la UPC], Statistical and Nonlinear Physics, Condensed Matter Physics, Geometry, Algebraic, Escape orbits, Geometria algebraica, [MATH.MATH-MP]Mathematics [math]/Mathematical Physics [math-ph], Fluids with dissipation, Varietats simplèctiques, Manifold with boundary, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], Cotangent models, b-symplectic geometry, Symplectic manifolds
Abstract: International audience; In this article we analyze several mathematical models with singularities where the classical cotangent model is replaced by a b-cotangent model. We provide physical interpretations of the singular symplectic geometry underlying in b-cotangent bundles featuring two models: the canonical (or nontwisted) model and the twisted one. The canonical one models systems on manifolds with boundary and the twisted one represents Hamiltonian systems with a singularity on the fiber. The twisted cotangent model includes (for linear potentials) the case of fluids with dissipation. We prove (non)existence of cotangent lift dynamics and show the existence of an infinite number of escape orbits in this model. We also discuss more general physical interpretations of the twisted and non-twisted b-symplectic models. Twisted b-symplectic models yield in a natural way escape orbits that go to the critical set. Under compactness assumptions those escape orbits are continued as singular periodic orbits in the sense of Miranda and Oms (2021) and Miranda (2020). These models offer a Hamiltonian formulation for systems which are dissipative, extending the horizons of Hamiltonian dynamics and opening a new approach to study non-conservative systems.
Published: 2023
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3. Quantum Feedback at the Solid-Liquid Interface: Flow-Induced Electronic Current and Its Negative Contribution to Friction

Author: Coquinot, Baptiste, Bocquet, Lydéric, Kavokine, Nikita, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Flatiron Institute, Simons Foundation, Max Planck Institute for Polymer Research, Max-Planck-Gesellschaft, and European Project: 785911,Shadoks
Subjects: [PHYS]Physics [physics], Condensed Matter - Materials Science, Statistical Mechanics (cond-mat.stat-mech), Condensed Matter - Mesoscale and Nanoscale Physics, General Physics and Astronomy, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Condensed Matter - Soft Condensed Matter, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Liquid-solid interfaces, Quantum field theory, Physics::Fluid Dynamics, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Electrical conductivity, Soft Condensed Matter (cond-mat.soft), [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Condensed Matter - Statistical Mechanics
Abstract: An electronic current driven through a conductor can induce a current in another conductor through the famous Coulomb drag effect. Similar phenomena have been reported at the interface between a moving fluid and a conductor, but their interpretation has remained elusive. Here, we develop a quantum-mechanical theory of the intertwined fluid and electronic flows, taking advantage of the non-equilibrium Keldysh framework. We predict that a globally neutral liquid can generate an electronic current in the solid wall along which it flows. This hydrodynamic Coulomb drag originates from both the Coulomb interactions between the liquid's charge fluctuations and the solid's charge carriers, and the liquid-electron interaction mediated by the solid's phonons. We derive explicitly the Coulomb drag current in terms of the solid's electronic and phononic properties, as well as the liquid's dielectric response, a result which quantitatively agrees with recent experiments at the liquid-graphene interface. Furthermore, we show that the current generation counteracts momentum transfer from the liquid to the solid, leading to a reduction of the hydrodynamic friction coefficient through a quantum feedback mechanism. Our results provide a roadmap for controlling nanoscale liquid flows at the quantum level, and suggest strategies for designing materials with low hydrodynamic friction.
Published: 2023
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4. Ion filling of a one-dimensional nanofluidic channel in the interaction confinement regime

Author: Paul Robin, Adrien Delahais, Lydéric Bocquet, Nikita Kavokine, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Max Planck Institute for Polymer Research, Max-Planck-Gesellschaft, Flatiron Institute, Simons Foundation, and European Project: 785911,Shadoks
Subjects: Chemical Physics (physics.chem-ph), Statistical Mechanics (cond-mat.stat-mech), Condensed Matter - Mesoscale and Nanoscale Physics, Ionic Conductivity, Nanofluidics, General Physics and Astronomy, FOS: Physical sciences, Condensed Matter - Soft Condensed Matter, Ions and properties, Electrolytes, Electrostatics, Nanochannels, Statistical thermodynamics, Physics - Chemical Physics, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Mean field theory, Soft Condensed Matter (cond-mat.soft), Physical and Theoretical Chemistry, Poisson-Boltzmann equation, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], Condensed Matter - Statistical Mechanics
Abstract: International audience; Ion transport measurements are widely used as an indirect probe for various properties of confined electrolytes. It is generally assumed that the ion concentration in a nanoscale channel is equal to the ion concentration in the macroscopic reservoirs it connects to, with deviations arising only in the presence of surface charges on the channel walls. Here, we show that this assumption may break down even in a neutral channel due to electrostatic correlations between the ions arising in the regime of interaction confinement, where Coulomb interactions are reinforced due to the presence of the channel walls. We focus on a one-dimensional channel geometry, where an exact evaluation of the electrolyte’s partition function is possible with a transfer operator approach. Our exact solution reveals that in nanometer-scale channels, the ion concentration is generally lower than in reservoirs and depends continuously on the bulk salt concentration, in contrast to the conventional mean-field theory that predicts an abrupt filling transition. We develop a modified mean-field theory taking into account the presence of ion pairs that agrees quantitatively with the exact solution and provides predictions for experimentally relevant observables, such as the ionic conductivity. Our results will guide the interpretation of nanoscale ion transport measurements.
Published: 2023
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5. Nanofluidics at the crossroads

Author: Paul Robin, Lydéric Bocquet, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), and European Project: 785911,Shadoks
Subjects: General Physics and Astronomy, Soft Condensed Matter (cond-mat.soft), FOS: Physical sciences, Condensed Matter - Soft Condensed Matter, Physical and Theoretical Chemistry, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract: International audience; Nanofluidics, the field interested in flows at the smallest scales, has grown at a fast pace, reaching an ever finer control of fluidic and ionic transport at the molecular level. Still, artificial pores are far from reaching the wealth of functionalities of biological channels that regulate sensory detection, biological transport and neurostransmission - all while operating at energies comparable to thermal noise. Here, we argue that artificial ionic machines can be designed by harnessing the entire wealth of phenomena available at the nanoscales and exploiting techniques developped in various fields of physics. As they are generally based on solid-state nanopores, rather than soft membranes and proteins, they should in particular aim at taking advantage of their specific properties such as their electronic structure or their ability to interact with light. These observations call for the design of new ways of probing nanofluidic systems. Nanofluidics is now at the crossroads, there are new avenues to build complex ionic machines and this may allow to develop new functionalities inspired by Nature.
Published: 2023
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6. Interaction confinement and electronic screening in two-dimensional nanofluidic channels

Author: Nikita Kavokine, Paul Robin, Lydéric Bocquet, Flatiron Institute, Simons Foundation, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), and European Project: 785911,Shadoks
Subjects: Chemical Physics (physics.chem-ph), [PHYS]Physics [physics], Ions, Statistical Mechanics (cond-mat.stat-mech), Condensed Matter - Mesoscale and Nanoscale Physics, FOS: Physical sciences, General Physics and Astronomy, Water, Condensed Matter - Soft Condensed Matter, Molecular Dynamics Simulation, Electrolytes, Physics - Chemical Physics, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Soft Condensed Matter (cond-mat.soft), Physical and Theoretical Chemistry, Electronics, Condensed Matter - Statistical Mechanics
Abstract: International audience; The transport of fluids at the nanoscale is fundamental to manifold biological and industrial processes, ranging from neurotransmission to ultrafiltration. Yet, it is only recently that well-controlled channels with cross sections as small as a few molecular diameters became an experimental reality. When aqueous electrolytes are confined within such channels, the Coulomb interactions between the dissolved ions are reinforced due to dielectric contrast at the channel walls: We dub this effect “interaction confinement.” Yet, no systematic way of computing these confined interactions has been proposed beyond the limiting cases of perfectly metallic or perfectly insulating channel walls. Here, we introduce a new formalism, based on the so-called surface response functions, that expresses the effective Coulomb interactions within a two-dimensional channel in terms of the wall’s electronic structure, described to any desired level of precision. We use it to demonstrate that in few-nanometer-wide channels, the ionic interactions can be tuned by the wall material’s screening length. We illustrate this approach by implementing these interactions in Brownian dynamics simulations of a strongly confined electrolyte and show that the resulting ionic conduction can be adjusted between Ohm’s law and a Wien effect behavior. Our results provide a quantitative approach to tuning nanoscale ion transport through the electronic properties of the channel wall material.
Published: 2022
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7. Enhanced nanofluidic transport in activated carbon nanoconduits

Author: Theo Emmerich, Kalangi S. Vasu, Antoine Niguès, Ashok Keerthi, Boya Radha, Alessandro Siria, Lydéric Bocquet, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), University of Manchester [Manchester], ANR-17-CE09-0046,NEPTUNE,Transport hors equilibre de fluides aux échelles nanométriques(2017), European Project: 785911,Shadoks, and European Project: 637748,H2020,ERC-2014-STG,NanoSOFT(2015)
Subjects: Theory and computation, [PHYS]Physics [physics], Ion Transport, Two-dimensional Materials, Mechanical Engineering, [SDV]Life Sciences [q-bio], MESH: Graphite, Biological Transport, General Chemistry, Condensed Matter Physics, Nanostructures, MESH: Charcoal, MESH: Ion Transport, MESH: Nanostructures, Fluid dynamics, Mechanics of Materials, Charcoal, MESH: Biological transport, Graphite, General Materials Science
Abstract: Carbon has emerged as a unique material in nanofluidics, with reports of fast water transport, molecular ion separation and efficient osmotic energy conversion. Many of these phenomena still await proper rationalization due to the lack of fundamental understanding of nanoscale ionic transport, which can only be achieved in controlled environments. Here we develop the fabrication of 'activated' two-dimensional carbon nanochannels. Compared with nanoconduits with 'pristine' graphite walls, this enables the investigation of nanoscale ionic transport in great detail. We show that activated carbon nanochannels outperform pristine channels by orders of magnitude in terms of surface electrification, ionic conductance, streaming current and (epi-)osmotic currents. A detailed theoretical framework enables us to attribute the enhanced ionic transport across activated carbon nanochannels to an optimal combination of high surface charge and low friction. Furthermore, this demonstrates the unique potential of activated carbon for energy harvesting from salinity gradients with single-pore power density across activated carbon nanochannels, reaching hundreds of kilowatts per square metre, surpassing alternative nanomaterials.
Published: 2022
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8. Long-term memory and synapse-like dynamics in two-dimensional nanofluidic channels

Author: Robin, P., Emmerich, T., Ismail, A., Niguès, A., You, Y., Nam, G.-H., Keerthi, A., Siria, A., Geim, A. K., Radha, B., Bocquet, L., Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), University of Manchester [Manchester], ANR-17-CE09-0046,NEPTUNE,Transport hors equilibre de fluides aux échelles nanométriques(2017), European Project: 785911,Shadoks, European Project: 899528 ,ITS-THIN, and European Project: 852674 ,AngstroCAP
Subjects: Multidisciplinary, Statistical Mechanics (cond-mat.stat-mech), Soft Condensed Matter (cond-mat.soft), FOS: Physical sciences, [PHYS.COND.CM-SM]Physics [physics]/Condensed Matter [cond-mat]/Statistical Mechanics [cond-mat.stat-mech], Condensed Matter - Soft Condensed Matter, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], Condensed Matter - Statistical Mechanics
Abstract: International audience; Fine-tuned ion transport across nanoscale pores is key to many biological processes, including neurotransmission. Recent advances have enabled the confinement of water and ions to two dimensions, unveiling transport properties inaccessible at larger scales and triggering hopes of reproducing the ionic machinery of biological systems. Here we report experiments demonstrating the emergence of memory in the transport of aqueous electrolytes across (sub)nanoscale channels. We unveil two types of nanofluidic memristors depending on channel material and confinement, with memory ranging from minutes to hours. We explain how large time scales could emerge from interfacial processes such as ionic self-assembly or surface adsorption. Such behavior allowed us to implement Hebbian learning with nanofluidic systems. This result lays the foundation for biomimetic computations on aqueous electrolytic chips.
Published: 2022
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9. Strong electronic winds blowing under liquid flows on carbon surfaces

Author: Mathieu Lizée, Alice Marcotte, Baptiste Coquinot, Nikita Kavokine, Karen Sobnath, Clément Barraud, Ankit Bhardwaj, Boya Radha, Antoine Niguès, Lydéric Bocquet, Alessandro Siria, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Max Planck Institute for Polymer Research, Max-Planck-Gesellschaft, Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)), Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), University of Manchester [Manchester], European Project: 785911,Shadoks, and European Project: 852674 ,AngstroCAP
Subjects: Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Nanofluidics, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Materials Science (cond-mat.mtrl-sci), Soft Condensed Matter (cond-mat.soft), FOS: Physical sciences, General Physics and Astronomy, Graphene, Condensed Matter - Soft Condensed Matter, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall]
Abstract: The interface between a liquid and a solid is the location of plethora of intrincate mechanisms at the nanoscale, at the root of their specific emerging properties in natural processes or technological applications. However, while the structural properties and chemistry of interfaces have been intensively explored, the effect of the solid-state electronic transport at the fluid interface has been broadly overlooked up to now. It has been reported that water flowing against carbon-based nanomaterials, such as carbon nanotubes or graphene sheets, does induce electronic currents, but the mechanism at stake remains controversial. Here, we unveil the molecular mechanisms underlying the hydro-electronic couplings by investigating the electronic conversion under flow at the nanoscale. We use a tuning fork-Atomic Force Microscope (AFM) to deposit and displace a micrometric droplet of both ionic and non-ionic liquids on a multilayer graphene sample, while recording the electrical current across the carbon flake. We report measurements of an oscillation-induced current which is several orders of magnitude larger than previously reported for water on carbon , and further boosted by the presence of surface wrinkles on the carbon layer. Our results point to a peculiar momentum transfer mechanism between fluid molecules and charge carriers in the carbon walls mediated by phonon excitations in the solid. Our findings pave the way for active control of fluid transfer at the nanoscale by harnessing the complex interplay between collective excitations in the solid and the molecules in the fluid., Accepted for publication at PRX
Published: 2022
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10. Coupled interactions at the ionic graphene/water interface

Author: Anton Robert, Hélène Berthoumieux, Marie-Laure Bocquet, Processus d'Activation Sélective par Transfert d'Energie Uni-électronique ou Radiatif (UMR 8640) (PASTEUR), Département de Chimie - ENS Paris, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique de la Matière Condensée (LPTMC), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Fachbereich Physik [Freie Univeristät Berlin] | Department of Physics [Freie Univeristät Berlin], Freie Universität Berlin, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), and European Project: 785911,Shadoks
Subjects: Electronic structure, Electrostatic interactions, Dielectric properties, Physics::Atomic and Molecular Clusters, General Physics and Astronomy, Soft Condensed Matter (cond-mat.soft), FOS: Physical sciences, Condensed Matter - Soft Condensed Matter, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Physics::Chemical Physics, Adsoption
Abstract: We compute ionic free energy adsorption profiles at aqueous graphene interface by developing a self-consistent approach. To do so, we design a microscopic model for water and put the liquid on an equal footing with the graphene described by its electronic band structure. By evaluating progressively the electronic/dipolar coupled electrostatic interactions, we show that the coupling level including mutual graphene/water screening permits to recover remarkably the precision of extensive quantum simulations. We further derive the potential of mean force evolution of several alkali cations.
Published: 2022
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11. Chemi-sorbed versus physi-sorbed surface charge and its impact on electrokinetic transport: carbon versus boron-nitride surface

Author: Mangaud, Etienne, Bocquet, Marie-Laure, Bocquet, Lydéric, Rotenberg, Benjamin, Laboratoire Modélisation et Simulation Multi-Echelle (MSME), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel, Processus d'Activation Sélective par Transfert d'Energie Uni-électronique ou Radiatif (UMR 8640) (PASTEUR), Département de Chimie - ENS Paris, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), and Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Chemical Physics (physics.chem-ph), [PHYS]Physics [physics], Physics - Chemical Physics, FOS: Physical sciences, General Physics and Astronomy, Physical and Theoretical Chemistry, Physics::Chemical Physics
Abstract: International audience; The possibility to control electrokinetic transport through carbon and hexagonal boron nitride (hBN) nanotubes has recently opened new avenues for nanofluidic approaches to face outstanding challenges such as energy production and conversion or water desalination. The pH-dependence of experimental transport coefficients point to the sorption of hydroxide ions as the microscopic origin of the surface charge and recent ab initio calculations suggest that these ions behave differently on carbon and hBN, with only physisorption on the former and both physi-and chemisorption on the latter. Using classical non-equilibrium molecular dynamics simulations of interfaces between an aqueous electrolyte and three models of hBN and graphite surfaces, we demonstrate the major influence of the sorption mode of hydroxide ions on the interfacial transport properties. Physisorbed surface charge leads to a considerable enhancement of the surface conductivity as compared to its chemisorbed counterpart, while values of the z-potential are less affected. The analysis of the MD results for the surface conductivity and z-potential in the framework of Poisson-Boltzmann-Stokes theory, as is usually done to analyze experimental data, further confirms the importance of taking into account both the mobility of surface hydroxide ions and the decrease of the slip length with increasing titratable surface charge density.
Published: 2021
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12. Life on the osmotic slopes

Author: Jeremie Palacci, Lydéric Bocquet, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), University of California [San Diego] (UC San Diego), University of California, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)
Subjects: Physics, [PHYS]Physics [physics], Biophysics, General Physics and Astronomy, 01 natural sciences, Particle transport, 010305 fluids & plasmas, Cell membrane, [SDV.BBM.BP]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biophysics, medicine.anatomical_structure, Statistical physics thermodynamics and nonlinear dynamics, 0103 physical sciences, medicine, Osmotic pressure, 010306 general physics, Mechanism (sociology), ComputingMilieux_MISCELLANEOUS
Abstract: Gradients in the concentration of a solute can drive particle transport by inducing interfacial flows via imbalances in the osmotic pressure near surfaces. Now it seems that this mechanism is directing traffic on the cell membrane.
Published: 2021
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13. Modeling of emergent memory and voltage spiking in ionic transport through angstr\'om-scale slits

Author: Robin, Paul, Kavokine, Nikita, Bocquet, Lydéric, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), ANR-10-IDEX-0001,PSL,Paris Sciences et Lettres(2010), ANR-10-LABX-0031,IPGG_LABEX,Pierre-Gilles de Gennes Institute for microfluidics(2010), European Project: 785911,Shadoks, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL
Subjects: [PHYS]Physics [physics], Multidisciplinary, Materials science, Nanofluidics, 02 engineering and technology, Memristor, Condensed Matter - Soft Condensed Matter, 021001 nanoscience & nanotechnology, 01 natural sciences, law.invention, Ion, Molecular dynamics, Neuromorphic engineering, Chemical physics, law, Electric field, 0103 physical sciences, Spontaneous emission, [PHYS.COND.CM-SM]Physics [physics]/Condensed Matter [cond-mat]/Statistical Mechanics [cond-mat.stat-mech], 010306 general physics, 0210 nano-technology, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], ComputingMilieux_MISCELLANEOUS, Condensed Matter - Statistical Mechanics, Voltage
Abstract: Recent advances in nanofluidics have enabled the confinement of water down to a single molecular layer. Such monolayer electrolytes show promise in achieving bioinspired functionalities through molecular control of ion transport. However, the understanding of ion dynamics in these systems is still scarce. Here, we develop an analytical theory, backed up by molecular dynamics simulations, that predicts strongly nonlinear effects in ion transport across quasi-two-dimensional slits. We show that under an electric field, ions assemble into elongated clusters, whose slow dynamics result in hysteretic conduction. This phenomenon, known as the memristor effect, can be harnessed to build an elementary neuron. As a proof of concept, we carry out molecular simulations of two nanofluidic slits that reproduce the Hodgkin-Huxley model and observe spontaneous emission of voltage spikes characteristic of neuromorphic activity.
Published: 2021
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14. Studying polymer diffusiophoresis with non-equilibrium molecular dynamics

Author: Simón Ramírez-Hinestrosa, Daan Frenkel, Lydéric Bocquet, Hiroaki Yoshida, Frenkel, Daan [0000-0002-6362-2021], Apollo - University of Cambridge Repository, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Laboratoire de physique de l'ENS - ENS Paris (LPENS), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
Subjects: Materials science, physics.chem-ph, General Physics and Astronomy, FOS: Physical sciences, Condensed Matter - Soft Condensed Matter, 010402 general chemistry, 01 natural sciences, chemistry.chemical_compound, Molecular dynamics, Diffusiophoresis, Physics - Chemical Physics, 0103 physical sciences, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), cond-mat.mes-hall, Physical and Theoretical Chemistry, chemistry.chemical_classification, Chemical Physics (physics.chem-ph), [PHYS]Physics [physics], cond-mat.soft, Quantitative Biology::Biomolecules, 010304 chemical physics, Solid particle, Condensed Matter - Mesoscale and Nanoscale Physics, Polymer, Computational Physics (physics.comp-ph), 0104 chemical sciences, Condensed Matter::Soft Condensed Matter, Monomer, chemistry, Chemical physics, physics.comp-ph, Soft Condensed Matter (cond-mat.soft), Concentration gradient, Physics - Computational Physics, Hydrodynamic flow
Abstract: International audience; We report a numerical study of the diffusiophoresis of short polymers using non-equilibrium molecular dynamics simulations. More precisely, we consider polymer chains in a fluid containing a solute which has a concentration gradient, and examine the variation of the induced diffusiophoretic velocity of the polymer chains as the interaction between the monomer and the solute is varied. We find that there is a non-monotonic relation between the diffusiophoretic mobility and the strength of the monomer-solute interaction. In addition we find a weak dependence of the mobility on the length of the polymer chain, which shows clear difference from the diffusiophoresis of a solid particle. Interestingly, the hydrodynamic flow through the polymer is much less screened than for pressure driven flows. a) Electronic mail: df246@cam.ac.uk 1 arXiv:1909.06352v2 [cond-mat.soft] 8 Apr 2020 Studying polymer diffusiophoresis with Non-Equilibrium Molecular Dynamics
Published: 2020
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15. Local and global force balance for diffusiophoretic transport

Author: Lydéric Bocquet, Hiroaki Yoshida, Sophie Marbach, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Laboratoire de physique de l'ENS - ENS Paris (LPENS), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
Subjects: [PHYS]Physics [physics], Physics, Statistical Mechanics (cond-mat.stat-mech), Tension (physics), Capillary action, Mechanical Engineering, FOS: Physical sciences, Mechanics, Condensed Matter - Soft Condensed Matter, Condensed Matter Physics, 01 natural sciences, Article, 010305 fluids & plasmas, Stress (mechanics), Mechanics of Materials, Diffusiophoresis, Electric field, 0103 physical sciences, Soft Condensed Matter (cond-mat.soft), Particle, 010306 general physics, Transport phenomena, Porous medium, ComputingMilieux_MISCELLANEOUS, Condensed Matter - Statistical Mechanics
Abstract: Electro- and diffusio- phoresis of particles correspond respectively to the transport of particles under electric field and solute concentration gradients. Such interfacial transport phenomena take their origin in a diffuse layer close to the particle surface, and the motion of the particle is force-free. In the case of electrophoresis, it is further expected that the stress acting on the moving particle vanishes locally as a consequence of local electroneutrality. But the argument does not apply to diffusiophoresis, which takes its origin in solute concentration gradients. In this paper we investigate further the local and global force balance on a particle undergoing diffusiophoresis. We calculate the local tension applied on the particle surface and show that, counter-intuitively, the local force on the particle does not vanish for diffusiophoresis, in spite of the global force being zero as expected. Incidentally, our description allows to clarify the osmotic balance in diffusiophoresis, which has been a source of debates in the recent years. We explore various cases, including hard and soft interactions, as well as porous particles, and provide analytic predictions for the local force balance in these various systems. The existence of local stresses may induce deformation of soft particles undergoing diffusiophoresis, hence suggesting applications in terms of particle separation based on capillary diffusiophoresis.
Published: 2020
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16. Nanotribology of Ionic Liquids: Transition to Yielding Response in Nanometric Confinement with Metallic Surfaces

Author: Antoine Lainé, Alessandro Siria, Antoine Niguès, Lydéric Bocquet, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Laboratoire de physique de l'ENS - ENS Paris (LPENS), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
Subjects: Materials science, Friction, QC1-999, Ionic fluids, General Physics and Astronomy, Ionic bonding, FOS: Physical sciences, Condensed Matter - Soft Condensed Matter, 01 natural sciences, 010305 fluids & plasmas, Atomic force microscopy, chemistry.chemical_compound, Phase (matter), 0103 physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, [PHYS]Physics [physics], Physics, Surface force, Condensed Matter & Materials Physics, Tribology, Condensed Matter::Soft Condensed Matter, chemistry, Phase transitions, Chemical physics, Ionic liquid, Nanotribology, Soft Condensed Matter (cond-mat.soft), Rheology, Contact area, Tribometer
Abstract: International audience; Room-temperature ionic liquids (RTILs) are molten salts which exhibit unique physical and chemical properties, commonly harnessed for lubrication and energy applications. The pure ionic nature of RTIL leads to strong electrostatic interactions among the liquid, furthermore exalted in the presence of interfaces and confinement. In this work, we use a tuning-fork-based dynamic surface force tribometer, which allows probing both the rheological and the tribological properties of RTIL films confined between a millimetric sphere and a surface, over a wide range of confinements. When the RTIL is confined between metallic surfaces, we see evidence of an abrupt change of its rheological properties below a threshold confinement. This is reminiscent of a recently reported confinement-induced capillary freezing, here observed with a wide contact area. In parallel, we probe the tribological response of the film under imposed nanometric shear deformation and unveil a yielding behavior of the interfacial solid phase below this threshold confinement. This is characterized by a transition from an elastic to a plastic regime, exhibiting striking similarities with the response of glassy materials. This transition to yielding of the RTIL in metallic confinement leads overall to a reduction in friction and offers a self-healing protection of the surfaces avoiding direct contact, with obvious applications in tribology.
Published: 2020
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17. Nanofluidics coming of age

Author: Lydéric Bocquet, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique de l'ENS - ENS Paris (LPENS), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
Subjects: Engineering, FOS: Physical sciences, Nanofluidics, Nanotechnology, 02 engineering and technology, Condensed Matter - Soft Condensed Matter, 010402 general chemistry, 01 natural sciences, General Materials Science, Turning point, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Condensed Matter - Statistical Mechanics, ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], Condensed Matter - Materials Science, Statistical Mechanics (cond-mat.stat-mech), [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Mechanics of the fluids [physics.class-ph], business.industry, Mechanical Engineering, Fluid Dynamics (physics.flu-dyn), Materials Science (cond-mat.mtrl-sci), General Chemistry, Physics - Fluid Dynamics, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Mechanics of Materials, Soft Condensed Matter (cond-mat.soft), 0210 nano-technology, business, Nexus (standard)
Abstract: This is a turning point for nanofluidics. Recent progress allows envisioning both fundamental discoveries for the transport of fluids at the ultimate scales, and disruptive technologies for the water-energy nexus., Comment
Published: 2020
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18. Resonant osmosis across active switchable membranes

Author: Lydéric Bocquet, Nikita Kavokine, Sophie Marbach, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Micromegas : Nano-Fluidique, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Laboratoire de physique de l'ENS - ENS Paris (LPENS), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris)
Subjects: Materials science, Ratchet, General Physics and Astronomy, FOS: Physical sciences, Condensed Matter - Soft Condensed Matter, 010402 general chemistry, Osmosis, 01 natural sciences, law.invention, law, Physics - Chemical Physics, 0103 physical sciences, Osmotic pressure, Semipermeable membrane, Physical and Theoretical Chemistry, Reverse osmosis, Filtration, ComputingMilieux_MISCELLANEOUS, Chemical Physics (physics.chem-ph), 010304 chemical physics, 6. Clean water, 0104 chemical sciences, Membrane, Permeability (electromagnetism), Chemical physics, Soft Condensed Matter (cond-mat.soft), [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract: To overcome the traditional paradigm of filtration, where separation is essentially performed upon steric sieving principles, we explore the concept of dynamic osmosis through active membranes. A partially permeable membrane presents a time-tuneable feature that changes the effective pore interaction with the solute and thus actively changes permeability with time. In general, we find that slow flickering frequencies effectively decrease the osmotic pressure and large flickering frequencies do not change it. In the presence of an asymmetric membrane, we find a resonant frequency where pumping of the solute is performed and can be analyzed in terms of ratchet transport. We discuss and highlight the properties of this resonant osmotic transport. Furthermore, we show that dynamic osmosis allows us to pump the solute at the nanoscale using less energy than reverse osmosis. This opens new possibilities to build advanced filtration devices and design artificial ionic machinery.
Published: 2020
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19. Mechanically activated ionic transport across single-digit carbon nanotubes

Author: Timothée Mouterde, Alessandro Siria, Antoine Niguès, Lydéric Bocquet, Alice Marcotte, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Université de Paris (UP)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Université de Paris (UP)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)
Subjects: Superlubricity, Ionic bonding, FOS: Physical sciences, Nanotechnology, 02 engineering and technology, Carbon nanotube, 010402 general chemistry, 01 natural sciences, law.invention, law, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), General Materials Science, Nanoscopic scale, ComputingMilieux_MISCELLANEOUS, Ion channel, Pressure sensitivity, Physics, [PHYS]Physics [physics], Condensed Matter - Mesoscale and Nanoscale Physics, Mechanical Engineering, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Mechanics of Materials, Ionic conductance, Mechanosensitive channels, 0210 nano-technology
Abstract: International audience; Fluid and ionic transport at nanoscale recently highlighted a wealth of exotic behaviours [1-14]. However, the artificial nanofluidic devices [15-18] are still far from the advanced functionalities existing in biological systems, such as electrically and mechanically activated transport [19, 20]. Here we focus on the ionic transport through 2 nm-radius individual multiwalled carbon nanotubes (CNT), under the combination of mechanical and electrical forcings. Our findings evidence mechanically activated ionic transport under the form of an ionic conductance which depends quadratically on the applied pressure. Our theoretical study relates this behaviour with the complex interplay between electrical and mechanical drivings, and shows that the superlubricity of CNT [4-8, 21] is a prerequisite to attain mechanically activated transport. The pressure sensitivity shares similarities with the response of biological mechanosensitive ion channels [19, 20] observed here for the first time in an artificial system. This paves the way to build new active nanofluidic functionalities inspired by the complex biological machinery.
Published: 2020
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20. Fluids at the Nanoscale: from continuum to sub-continuum transport

Author: Kavokine, Nikita, Netz, Roland R., Bocquet, Lydéric, Netz, Roland, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Micromegas : Nano-Fluidique, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Fachbereich Physik, Freie Universität Berlin, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris)
Subjects: [PHYS]Physics [physics], Physics, Continuum (measurement), Fluid Dynamics (physics.flu-dyn), FOS: Physical sciences, Nanofluidics, Fluid mechanics, 02 engineering and technology, Statistical mechanics, Physics - Fluid Dynamics, Condensed Matter - Soft Condensed Matter, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Physics::Fluid Dynamics, Classical mechanics, 0103 physical sciences, Soft Condensed Matter (cond-mat.soft), 010306 general physics, 0210 nano-technology, Nanoscopic scale
Abstract: International audience; Nanofluidics has firmly established itself as a new field in fluid mechanics, as novel properties have been shown to emerge in fluids at the nanometric scale. Thanks to recent developments in fabrication technology, artificial nanofluidic systems are now being designed at the scale of biological nanopores. This ultimate step in scale reduction has pushed the development of new experimental techniques and new theoretical tools, bridging fluid mechanics, statistical mechanics, and condensed matter physics. This review is intended as a toolbox for fluids at the nanometer scale. After presenting the basic equations that govern fluid behavior in the continuum limit, we show how these equations break down and new properties emerge in molecular-scale confinement. A large number of analytical estimates and physical arguments are given to organize the results and different limits.
Published: 2020
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21. Transport ionique non-linéaire aux échelles nanométrique and Ångströmétrique

Author: Poggioli, Anthony R., Laboratoire de physique de l'ENS - ENS Paris (LPENS), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Micromegas : Nano-Fluidique, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres, and Lydéric Bocquet
Subjects: Ångströfluidics, Microscopy, Ångströfluidique, Hydrodynamique, Nanofluidics, Hydrodynamics, Nanofluidique, Transport, Nonlinear, Non-Linéaire, Microscopie, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract: Nanofluidics research is motivated both by intrinsic interest in the novel transport phenomena observable only at the (sub-)nanometric scale, and by applications including energy generation, desalination, macromolecular analysis, and microscopy. Two key considerations in the development of such technologies are 1) the control of nonlinear ionic transport and 2) the characterization of electrostatic, frictional, and other interactions of solid-liquid interfaces with bulk electrolyte solutions. In this manuscript, I develop a coherent theory of ion-selectivity and nonlinear ionic transport in nanopores & 1 nm in diameter, rationalizing previous experimental work and offering new routes in the development of desalination, energy generation, and other exotic functionalities. I then explore each of the above considerations separately. First, I explore the limits of continuum theory in rationalizing nonlinear coupled transport observed experimentally in ångströmetric channels, revealing the irrelevance of the Navier-Stokes description of the fluid dynamics at this scale and highlighting the role of the frictional characteristics of the confining material. Finally, I examine the surface-controlled modification of applied electric fields in scanning ion conductance microscopy, proposing a new approach for the imaging of surface charge that may substantially improve on the spatial resolution of current techniques.; La recherche en nanofluidique est motivée à la fois par l’intérêt intrinsèque des nouveaux phénomènes de transport observables uniquement à cette échelle, et par les applications qui en résultent comme la production d’énergie, le dessalement, l’analyse macromoléculaire et la microscopie. Deux points clés pour le développement de telles technologies sont : 1) le contrôle du transport ionique non-linéaire et 2) la caractérisation des propriétés électrostatiques, frictionnelles et autres des interfaces solide-liquide avec des solutions électrolytiques. Dans ce manuscrit, je m’intéresse à la sélectivité ionique ainsi qu’au transport non linéaire des ions dans les nanopores. Je développe une théorie cohérente qui permet de rationaliser les travaux expérimentaux précédents et ouvre des nouvelles voies pour le dessalement et la génération d’énergie. J’explore ensuite chacun des deux points clés cites précédemment. D’abord, j’étudie les limites de l’approche en milieu continu à travers l’exemple du couplage non-linéaire observé pour le transport dans des canaux qui font quelques ångström d’épaisseur. Dans ce cadre, je montre que l’équation de Navier-Stokes ne permet plus de décrire correctement la dynamique des fluides (à cette échelle), et je mets en évidence l’importance des propriétés de friction du matériau qui confine le liquide. Enfin, j’explore l’effet des propriétés de surface sur le champ électrique appliqué en Microscopie à conductance ionique à balayage (Scanning Ion Conductance Microscopy). Je propose une nouvelle approche pour l’imagerie de la charge de surface qui pourrait améliorer considérablement la résolution spatiale des techniques actuelles.
Published: 2019

22. Nonlinear ionic transport at the nanometric and Ångströmetric scales

Author: Poggioli, Anthony R., Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Micromegas : Nano-Fluidique, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres, and Lydéric Bocquet
Subjects: Ångströfluidics, Microscopy, Ångströfluidique, Hydrodynamique, Nanofluidics, Hydrodynamics, Nanofluidique, Transport, Nonlinear, Non-Linéaire, Microscopie, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract: Nanofluidics research is motivated both by intrinsic interest in the novel transport phenomena observable only at the (sub-)nanometric scale, and by applications including energy generation, desalination, macromolecular analysis, and microscopy. Two key considerations in the development of such technologies are 1) the control of nonlinear ionic transport and 2) the characterization of electrostatic, frictional, and other interactions of solid-liquid interfaces with bulk electrolyte solutions. In this manuscript, I develop a coherent theory of ion-selectivity and nonlinear ionic transport in nanopores & 1 nm in diameter, rationalizing previous experimental work and offering new routes in the development of desalination, energy generation, and other exotic functionalities. I then explore each of the above considerations separately. First, I explore the limits of continuum theory in rationalizing nonlinear coupled transport observed experimentally in ångströmetric channels, revealing the irrelevance of the Navier-Stokes description of the fluid dynamics at this scale and highlighting the role of the frictional characteristics of the confining material. Finally, I examine the surface-controlled modification of applied electric fields in scanning ion conductance microscopy, proposing a new approach for the imaging of surface charge that may substantially improve on the spatial resolution of current techniques.; La recherche en nanofluidique est motivée à la fois par l’intérêt intrinsèque des nouveaux phénomènes de transport observables uniquement à cette échelle, et par les applications qui en résultent comme la production d’énergie, le dessalement, l’analyse macromoléculaire et la microscopie. Deux points clés pour le développement de telles technologies sont : 1) le contrôle du transport ionique non-linéaire et 2) la caractérisation des propriétés électrostatiques, frictionnelles et autres des interfaces solide-liquide avec des solutions électrolytiques. Dans ce manuscrit, je m’intéresse à la sélectivité ionique ainsi qu’au transport non linéaire des ions dans les nanopores. Je développe une théorie cohérente qui permet de rationaliser les travaux expérimentaux précédents et ouvre des nouvelles voies pour le dessalement et la génération d’énergie. J’explore ensuite chacun des deux points clés cites précédemment. D’abord, j’étudie les limites de l’approche en milieu continu à travers l’exemple du couplage non-linéaire observé pour le transport dans des canaux qui font quelques ångström d’épaisseur. Dans ce cadre, je montre que l’équation de Navier-Stokes ne permet plus de décrire correctement la dynamique des fluides (à cette échelle), et je mets en évidence l’importance des propriétés de friction du matériau qui confine le liquide. Enfin, j’explore l’effet des propriétés de surface sur le champ électrique appliqué en Microscopie à conductance ionique à balayage (Scanning Ion Conductance Microscopy). Je propose une nouvelle approche pour l’imagerie de la charge de surface qui pourrait améliorer considérablement la résolution spatiale des techniques actuelles.
Published: 2019

23. Friction multi-échelles sur la glace et la neige

Author: Canale, Luca, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Micromegas : Nano-Fluidique, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres, Lydéric Bocquet, Alessandro Siria, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris)
Subjects: Tribology, [PHYS.PHYS]Physics [physics]/Physics [physics], Ice, Matière molle, Tribologie, Rhéologie, Neige, Atomic force microscopy, Nanoscience, Microscopie à force atomique, Snow, Soft matter, Rheology, Glace, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract: In this manuscript, we present a multiscale experimental study of ice and snow friction. The slipperiness of ice and snow is a common knowledge, but the very mechanism behind this observation has been a fundamental mystery for more than 150 years. Here, we first present a macroscopic tribometer, which allows for a proper characterization of the friction coefficient on ice and snow. However, we show that the experimental macroscopic findings cannot reveal directly the local interfacial properties. Hence, we introduce a novel instrument, which combines tribological and rheological capabilities with nanoscopic sensitivity. It is a macroscopic tuning fork, based on atomic force microscopy. Our measurements show that ice slipperiness originates from a nanometric lubricating film due to ice melting under shear. More unexpected is that the interfacial meltwater is far from any "simple water". It has a yielding behavior and a visco-elastic one under flow. The tribological results are intimately related to such properties. Our findings ask for a fundamental overhaul of the existing framework describing ice friction. More generally, it is also a building block for a better understanding of friction mechanisms in phase changing materials.; Dans ce manuscrit, nous présentons une étude expérimentale multiéchelles de la friction sur la glace et la neige. Ces deux matériaux sont connus depuis longtemps pour être extrêmement glissants. Cependant, le mécanisme physique derrière ce phénomène n’est pas encore compris aujourd’hui. Dans un premier temps, nous présentons un tribomètre macroscopique qui permet de caractériser précisément le coefficient de friction d’un mobile glissant sur la glace et la neige. Nous montrons, cependant, qu’on ne peut pas inférer directement les propriétés locales du contact à partir de l’observation des propriétés macroscopiques. Nous introduisons alors un nouvel instrument qui permet des mesures rhéologiques et tribologiques simultanées. Il s’agit d’un diapason macroscopique basé sur le principe de fonctionnement d’un microscope à force atomique. Nos mesures montrent que le caractère glissant de la glace est dû à un film lubrifiant nanométrique, créé sous l’effet du cisaillement. Cependant, ce film n’est pas fait d’eau liquide, mais possède un comportement non newtonien : il s’agit d’un fluide à seuil, avec un comportement visco-élastique. Nous montrons que les propriétés tribologiques de la glace sont intimement liées aux propriétés rhéologiques de ce film. Nos mesures remettent donc en question les théories existantes sur la glace et posent les premières bases pour comprendre plus généralement la friction dans les systèmes à transition de phase.
Published: 2019

24. Adsorption Kinetics in Open Nanopores as a Source of Low-Frequency Noise

Author: Simon Gravelle, Roland R. Netz, Lydéric Bocquet, Queen Mary University of London (QMUL), Physik Department [Garching], Technische Universität Munchen - Université Technique de Munich [Munich, Allemagne] (TUM), Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7), Technische Universität München [München] (TUM), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), and Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, Infrasound, Ionic bonding, Bioengineering, 02 engineering and technology, Low frequency, power spectral density, Molecular dynamics, General Materials Science, Diffusion (business), [PHYS.COND.CM-SM]Physics [physics]/Condensed Matter [cond-mat]/Statistical Mechanics [cond-mat.stat-mech], ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], 1/f noise, Mechanical Engineering, 500 Naturwissenschaften und Mathematik::530 Physik::530 Physik, Spectral density, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, molecular dynamics, Chemical physics, Exponent, Current (fluid), 0210 nano-technology, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract: Ionic current measurements through solid-state nanopores consistently show a power spectral density that scales as 1/f α at low frequency f, with an exponent α ∼ 0.5–1.5, but strikingly, the physical origin of this behavior remains elusive. Here, we perform simulations of particles reversibly adsorbing at the surface of a nanopore and show that the fluctuations in the number of adsorbed particles exhibit low-frequency pink noise. We furthermore propose theoretical modeling for the time-dependent adsorption of particles on the nanopore surface for various geometries, which predicts a frequency spectrum in very good agreement with the simulation results. Altogether, our results highlight that the low-frequency noise takes its origin in the reversible adsorption of ions at the pore surface combined with the long-lasting excursions of the ions in the reservoirs. The scaling regime of the power spectrum extends down to a cutoff frequency which is far smaller than simple diffusion estimates. Using realistic values for the pore dimensions and the adsorption–desorption kinetics, this predicts the observation of pink noise for frequencies down to the hertz for a typical solid-state nanopore, in good agreement with experiments.
Published: 2019
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25. Atomic rheology of gold nanojunctions

Author: Alessandro Siria, Jean Comtet, Antoine Lainé, Antoine Niguès, Lydéric Bocquet, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7), Micromegas : Nano-Fluidique, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7)-École normale supérieure - Paris (ENS Paris), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS)
Subjects: Physics, Length scale, [PHYS]Physics [physics], Multidisciplinary, Capillary bridges, Condensed Matter - Mesoscale and Nanoscale Physics, FOS: Physical sciences, 02 engineering and technology, Orders of magnitude (numbers), Dissipation, 021001 nanoscience & nanotechnology, 01 natural sciences, Atomic units, Condensed Matter::Soft Condensed Matter, Rheology, Chemical physics, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, Dissipative system, Deformation (engineering), [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, 0210 nano-technology, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], ComputingMilieux_MISCELLANEOUS
Abstract: Despite extensive investigations of dissipation and deformation processes in micro- and nano- sized metallic samples, the mechanisms at play during deformation of systems with ultimate, molecular size remain elusive. While metallic nanojunctions, obtained by stretching metallic wires down to the atomic level are a system of choice to explore atomic scale contacts, it has not been possible up to now to extract the full equilibrium and out of equilibrium rheological flow properties of matter at such scales. Here, by using a quartz-tuning fork based Atomic Force Microscope (TF-AFM), we combine electrical and rheological measurement on angstr\"om-size gold junctions to study the non linear rheology of this model atomic system. By submitting the junction to increasing sub-nanometric deformations we uncover a transition from a purely elastic regime to a plastic, and eventually to a viscous-like fluidized regime, akin to the rheology of soft yielding materials, though orders of magnitude difference in length scale. The fluidized state furthermore highlights capillary attraction, as expected for liquid capillary bridges. This shear fluidization cannot be captured by classical models of friction between atomic planes, pointing to unexpected dissipative behavior of defect-free metallic junctions at the ultimate scales. Atomic rheology is therefore a powerful tool to probe the structural reorganization of atomic contacts.
Published: 2019
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26. Ionic Coulomb blockade as a fractional Wien effect

Author: Nikita Kavokine, Sophie Marbach, Alessandro Siria, Lydéric Bocquet, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), and Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Biomedical Engineering, Ionic bonding, FOS: Physical sciences, Bioengineering, Nanofluidics, 02 engineering and technology, Condensed Matter - Soft Condensed Matter, 010402 general chemistry, 01 natural sciences, Ion, Physics - Chemical Physics, Coulomb, General Materials Science, Electrical and Electronic Engineering, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Ion transporter, Condensed Matter - Statistical Mechanics, ComputingMilieux_MISCELLANEOUS, Physics, Chemical Physics (physics.chem-ph), [PHYS]Physics [physics], Statistical Mechanics (cond-mat.stat-mech), Wien effect, Coulomb blockade, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, Ion pump, Chemical physics, Soft Condensed Matter (cond-mat.soft), 0210 nano-technology, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract: Recent advances in nanofluidics have allowed the exploration of ion transport down to molecular-scale confinement, yet artificial porins are still far from reaching the advanced functionalities of biological ion machinery. Achieving single ion transport that is tunable by an external gate-the ionic analogue of electronic Coulomb blockade-would open new avenues in this quest. However, an understanding of ionic Coulomb blockade beyond the electronic analogy is still lacking. Here, we show that the many-body dynamics of ions in a charged nanochannel result in quantized and strongly nonlinear ionic transport, in full agreement with molecular simulations. We find that ionic Coulomb blockade occurs when, upon sufficient confinement, oppositely charged ions form 'Bjerrum pairs', and the conduction proceeds through a mechanism reminiscent of Onsager's Wien effect. Our findings open the way to novel nanofluidic functionalities, such as an ion pump based on ionic Coulomb blockade, inspired by its electronic counterpart.
Published: 2019
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27. Two recipes for repelling hot water

Author: Antonio Checco, Pierre Lecointre, Christophe Clanet, Gaëlle Lehoucq, Timothée Mouterde, David Quéré, Laboratoire de Physique Statistique de l'ENS (LPS), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7), Thales Research and Technology [Palaiseau], THALES, Brookhaven National Laboratory [Upton, NY] (BNL), U.S. Department of Energy [Washington] (DOE)-UT-Battelle, LLC-Stony Brook University [SUNY] (SBU), State University of New York (SUNY)-State University of New York (SUNY), Laboratoire d'hydrodynamique (LadHyX), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Physique et mécanique des milieux hétérogenes (UMR 7636) (PMMH), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)
Subjects: 0301 basic medicine, Materials science, Science, FOS: Physical sciences, General Physics and Astronomy, 02 engineering and technology, Condensed Matter - Soft Condensed Matter, Article, General Biochemistry, Genetics and Molecular Biology, 03 medical and health sciences, [SPI]Engineering Sciences [physics], lcsh:Science, ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], Multidisciplinary, Solid surface, Drop (liquid), [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Fluid Dynamics (physics.flu-dyn), Physics - Fluid Dynamics, General Chemistry, 021001 nanoscience & nanotechnology, 6. Clean water, 030104 developmental biology, Chemical physics, Soft Condensed Matter (cond-mat.soft), lcsh:Q, 0210 nano-technology
Abstract: Although a hydrophobic microtexture at a solid surface most often reflects rain owing to the presence of entrapped air within the texture, it is much more challenging to repel hot water. As it contacts a colder material, hot water generates condensation within the cavities at the solid surface, which eventually builds bridges between the substrate and the water, and thus destroys repellency. Here we show that both “small” (~100 nm) and “large” (~10 µm) model features do reflect hot drops at any drop temperature and in the whole range of explored impact velocities. Hence, we can define two structural recipes for repelling hot water: drops on nanometric features hardly stick owing to the miniaturization of water bridges, whereas kinetics of condensation in large features is too slow to connect the liquid to the solid at impact., It has previously been reported that hot drops impacting on a colder surface can lead to loss of surface hydrophobicity unless the surface features are very small. Here the authors find that both small and large features but not intermediate ones are able to preserve hydrophobicity.
Published: 2019
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28. MicroMegascope based dynamic Surface Force Apparatus

Author: Antoine Lainé, Laetitia Jubin, Lydéric Bocquet, Antoine Niguès, Alessandro Siria, Luca Canale, Stephen H. Donaldson, Laboratoire de Physique Statistique de l'ENS (LPS), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), Université Paris Diderot - Paris 7 (UPD7)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7), Micromegas : Nano-Fluidique, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), ANR-10-LABX-0010,ENS-ICFP,ENS- International Center for Fundamental Physics and its interfaces(2010), European Project: 637748,H2020,ERC-2014-STG,NanoSOFT(2015), and European Project: 785911,Shadoks
Subjects: Materials science, Physics - Instrumentation and Detectors, Acoustics, FOS: Physical sciences, Bioengineering, 02 engineering and technology, Condensed Matter - Soft Condensed Matter, 010402 general chemistry, 01 natural sciences, General Materials Science, Soft matter, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Electrical and Electronic Engineering, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], Mechanical Engineering, Mechanical impedance, Surface forces apparatus, Instrumentation and Detectors (physics.ins-det), General Chemistry, 021001 nanoscience & nanotechnology, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], 0104 chemical sciences, Characterization (materials science), Shear (sheet metal), Interferometry, Mechanics of Materials, Force dynamics, Nanotribology, Soft Condensed Matter (cond-mat.soft), 0210 nano-technology
Abstract: International audience; Surface Force Apparatus (SFA) allows to accurately resolve the interfacial properties of fluids confined between extended surfaces. The accuracy of the SFA makes it an ubiquitous tool for the nanoscale mechanical characterization of soft matter systems. The SFA traditionally measures force-distance profiles through interferometry with subnanometric distance precision. However, these techniques often require a dedicated and technically demanding experimental setup, and there remains a need for versatile and simple force-distance measurement tools. Here we present a MicroMegascope based dynamic Surface Force Apparatus capable of accurate measurement of the dynamic force profile of a liquid confined between a millimetric sphere and a planar substrate. Normal and shear mechanical impedance is measured within the classical Frequency Modulation framework. We measure rheological and frictional properties from micrometric to molecular confinement. We also highlight the resolution of small interfacial features such as ionic liquid layering. This apparatus shows promise as a versatile force-distance measurement device for exotic surfaces or extreme environments.
Published: 2019
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29. Ballistics of self-jumping microdroplets

Author: Atikur Rahman, Pierre Lecointre, Timothée Mouterde, David Quéré, Charles T. Black, Antonio Checco, Christophe Clanet, Laboratoire de Physique Statistique de l'ENS (LPS), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7), Brookhaven National Laboratory [Upton, NY] (BNL), U.S. Department of Energy [Washington] (DOE)-UT-Battelle, LLC-Stony Brook University [SUNY] (SBU), State University of New York (SUNY)-State University of New York (SUNY), Center for Functional Nanomaterials, State University of New York (SUNY)-State University of New York (SUNY)-U.S. Department of Energy [Washington] (DOE)-UT-Battelle, LLC-Stony Brook University [SUNY] (SBU), Laboratoire d'hydrodynamique (LadHyX), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Physique et mécanique des milieux hétérogenes (UMR 7636) (PMMH), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)
Subjects: [PHYS]Physics [physics], Fluid Flow and Transfer Processes, Materials science, media_common.quotation_subject, Computational Mechanics, Ballistics, 02 engineering and technology, Mechanics, 021001 nanoscience & nanotechnology, Inertia, 01 natural sciences, Slow flight, 010305 fluids & plasmas, Physics::Fluid Dynamics, Lift (force), Viscosity, Modeling and Simulation, 0103 physical sciences, Jump, Takeoff, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS, Microscale chemistry, media_common
Abstract: Droplets merging on hydrophobic nanocones jump off, and the takeoff speed is found to be maximum at microscale, below and above which viscosity and inertia, respectively, cap this speed. Microdroplets successively experience strong lift off, slow flight, and smooth landing, which impedes bouncing.
Published: 2019
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30. Beyond the Tradeoff: Dynamic Selectivity in Ionic Transport and Current Rectification

Author: Alessandro Siria, Lydéric Bocquet, Anthony R. Poggioli, Laboratoire de Physique Statistique de l'ENS (LPS), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7)
Subjects: Materials science, Ionic bonding, 010402 general chemistry, 7. Clean energy, 01 natural sciences, Quantitative Biology::Subcellular Processes, symbols.namesake, 0103 physical sciences, Materials Chemistry, Surface charge, Physical and Theoretical Chemistry, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Debye length, ComputingMilieux_MISCELLANEOUS, Debye, [PHYS]Physics [physics], Physics::Biological Physics, 010304 chemical physics, Conductance, 0104 chemical sciences, Surfaces, Coatings and Films, Nanopore, Membrane, Chemical physics, symbols, Selectivity, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract: Traditionally, ion selectivity in nanopores and nanoporous membranes is understood to be a consequence of Debye overlap, in which the Debye screening length is comparable to the nanopore radius somewhere along the length of the nanopore(s). This criterion sets a significant limitation on the size of ion-selective nanopores, as the Debye length is on the order of 1-10 nm for typical ionic concentrations. However, the analytical results we present here demonstrate that surface conductance generates a dynamical selectivity in ion transport, and this selectivity is controlled by so-called Dukhin, rather than Debye, overlap. The Dukhin length, defined as the ratio of surface to bulk conductance, reaches values of hundreds of nanometers for typical surface charge densities and ionic concentrations, suggesting the possibility of designing large-nanopore (10-100 nm), high-conductance membranes exhibiting significant ion selectivity. Such membranes would have potentially dramatic implications for the efficiency of osmotic energy conversion and separation techniques. Furthermore, we demonstrate that this mechanism of dynamic selectivity leads ultimately to the rectification of ionic current, rationalizing previous studies, showing that Debye overlap is not a necessary condition for the occurrence of rectifying behavior in nanopores.
Published: 2019
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31. Osmosis, from molecular insights to large-scale applications

Author: Sophie Marbach, Lydéric Bocquet, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7), Micromegas : Nano-Fluidique, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7)-École normale supérieure - Paris (ENS Paris), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS)
Subjects: Materials science, FOS: Physical sciences, 02 engineering and technology, Applied Physics (physics.app-ph), Condensed Matter - Soft Condensed Matter, 010402 general chemistry, Osmosis, 01 natural sciences, 7. Clean energy, Desalination, Physics - Chemical Physics, Osmotic power, Autocatalytic reaction, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], [PHYS.COND.CM-SM]Physics [physics]/Condensed Matter [cond-mat]/Statistical Mechanics [cond-mat.stat-mech], Reverse osmosis, ComputingMilieux_MISCELLANEOUS, Condensed Matter - Statistical Mechanics, [PHYS]Physics [physics], Chemical Physics (physics.chem-ph), Statistical Mechanics (cond-mat.stat-mech), Scale (chemistry), Fluid Dynamics (physics.flu-dyn), General Chemistry, Physics - Applied Physics, Physics - Fluid Dynamics, 021001 nanoscience & nanotechnology, 6. Clean water, 0104 chemical sciences, Membrane, Soft Condensed Matter (cond-mat.soft), Biochemical engineering, 0210 nano-technology, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract: Osmosis is a universal phenomenon occurring in a broad variety of processes and fields. It is the archetype of entropic forces, both trivial in its fundamental expression - the van 't Hoff perfect gas law - and highly subtle in its physical roots. While osmosis is intimately linked with transport across membranes, it also manifests itself as an interfacial transport phenomenon: the so-called diffusio-osmosis and -phoresis, whose consequences are presently actively explored for example for the manipulation of colloidal suspensions or the development of active colloidal swimmers. Here we give a global and unifying view of the phenomenon of osmosis and its consequences with a multi-disciplinary perspective. Pushing the fundamental understanding of osmosis allows to propose new perspectives for different fields and we highlight a number of examples along these lines, for example introducing the concepts of osmotic diodes, active separation and far from equilibrium osmosis, raising in turn fundamental questions in the thermodynamics of separation. The applications of osmosis are also obviously considerable and span very diverse fields. Here we discuss a selection of phenomena and applications where osmosis shows great promises: osmotic phenomena in membrane science (with recent developments in separation, desalination, reverse osmosis for water purification thanks in particular to the emergence of new nanomaterials); applications in biology and health (in particular discussing the kidney filtration process); osmosis and energy harvesting (in particular, osmotic power and blue energy as well as capacitive mixing); applications in detergency and cleaning, as well as for oil recovery in porous media., Comment: review on osmotic phenomena, accepted for publication to Chemical Society Reviews (final version)
Published: 2019
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32. Entrance effects in concentration-gradient-driven flow through an ultrathin porous membrane

Author: Daniel J. Rankin, David M. Huang, Lydéric Bocquet, University of Adelaide, Laboratoire de Physique Statistique de l'ENS (LPS), Université Paris Diderot - Paris 7 (UPD7)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Université Paris Diderot - Paris 7 (UPD7)
Subjects: Materials science, Flow (psychology), FOS: Physical sciences, General Physics and Astronomy, Condensed Matter - Soft Condensed Matter, 010402 general chemistry, 7. Clean energy, 01 natural sciences, Desalination, Nanomaterials, Quantitative Biology::Subcellular Processes, Physics - Chemical Physics, Electric field, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], [PHYS.COND.CM-SM]Physics [physics]/Condensed Matter [cond-mat]/Statistical Mechanics [cond-mat.stat-mech], Physical and Theoretical Chemistry, Scaling, ComputingMilieux_MISCELLANEOUS, Pressure gradient, [PHYS]Physics [physics], Chemical Physics (physics.chem-ph), Condensed Matter - Materials Science, Physics::Biological Physics, Range (particle radiation), Condensed Matter - Mesoscale and Nanoscale Physics, 010304 chemical physics, Fluid Dynamics (physics.flu-dyn), Materials Science (cond-mat.mtrl-sci), Physics - Fluid Dynamics, 6. Clean water, 0104 chemical sciences, Membrane, Chemical physics, Soft Condensed Matter (cond-mat.soft), [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract: Transport of liquid mixtures through porous membranes is central to processes such as desalination, chemical separations, and energy harvesting, with ultrathin membranes made from novel 2D nanomaterials showing exceptional promise. Here, we derive, for the first time, general equations for the solution and solute fluxes through a circular pore in an ultrathin planar membrane induced by a solute concentration gradient. We show that the equations accurately capture the fluid fluxes measured in finite-element numerical simulations for weak solute–membrane interactions. We also derive scaling laws for these fluxes as a function of the pore size and the strength and range of solute–membrane interactions. These scaling relationships differ markedly from those for concentration-gradient-driven flow through a long cylindrical pore or for flow induced by a pressure gradient or an electric field through a pore in an ultrathin membrane. These results have broad implications for transport of liquid mixtures through membranes with thickness on the order of the characteristic pore size.Transport of liquid mixtures through porous membranes is central to processes such as desalination, chemical separations, and energy harvesting, with ultrathin membranes made from novel 2D nanomaterials showing exceptional promise. Here, we derive, for the first time, general equations for the solution and solute fluxes through a circular pore in an ultrathin planar membrane induced by a solute concentration gradient. We show that the equations accurately capture the fluid fluxes measured in finite-element numerical simulations for weak solute–membrane interactions. We also derive scaling laws for these fluxes as a function of the pore size and the strength and range of solute–membrane interactions. These scaling relationships differ markedly from those for concentration-gradient-driven flow through a long cylindrical pore or for flow induced by a pressure gradient or an electric field through a pore in an ultrathin membrane. These results have broad implications for transport of liquid mixtures through m...
Published: 2019
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33. Ultrafast photomechanical transduction through thermophoretic implosion

Author: Antoine Niguès, Nikita Kavokine, Ruibin Liu, Shuangyang Zou, Bingsuo Zou, Lydéric Bocquet, Micromegas : Nano-Fluidique, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Laboratoire de physique de l'ENS - ENS Paris (LPENS), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
Subjects: Explosive material, Science, FOS: Physical sciences, General Physics and Astronomy, Implosion, 02 engineering and technology, Condensed Matter - Soft Condensed Matter, 01 natural sciences, Instability, Article, General Biochemistry, Genetics and Molecular Biology, Thermophoresis, Fluid dynamics, Laser propulsion, 0103 physical sciences, Soft matter, Statistical physics, thermodynamics and nonlinear dynamics, 010306 general physics, lcsh:Science, Physics, [PHYS]Physics [physics], Millisecond, Multidisciplinary, General Chemistry, Mechanics, 021001 nanoscience & nanotechnology, Soft Condensed Matter (cond-mat.soft), lcsh:Q, 0210 nano-technology, Jeans instability
Abstract: Since the historical experiments of Crookes, the direct manipulation of matter by light has been both a challenge and a source of scientific debate. Here we show that laser illumination allows to displace a vial of nanoparticle solution over centimetre-scale distances. Cantilever-based force measurements show that the movement is due to millisecond-long force spikes, which are synchronised with a sound emission. We observe that the nanoparticles undergo negative thermophoresis, and ultrafast imaging reveals that the force spikes are followed by the explosive growth of a bubble in the solution. We propose a mechanism accounting for the propulsion based on a thermophoretic instability of the nanoparticle cloud, analogous to the Jeans’s instability that occurs in gravitational systems. Our experiments demonstrate a new type of laser propulsion and a remarkably violent actuation of soft matter, reminiscent of the strategy used by certain plants to propel their spores., Here, the authors observe that laser illumination allows to displace a vial of nanoparticle solution over centimetre-scale distances. In order to explain this, they describe a novel mechanism for laser propulsion of a macroscopic object, based on light-induced thermophoresis.
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33 results on '"Micromegas : Nano-Fluidique"'

1. Unified non-equilibrium simulation methodology for flow through nanoporous carbon membrane

2. Singular cotangent models in fluids with dissipation

3. Quantum Feedback at the Solid-Liquid Interface: Flow-Induced Electronic Current and Its Negative Contribution to Friction

4. Ion filling of a one-dimensional nanofluidic channel in the interaction confinement regime

5. Nanofluidics at the crossroads

6. Interaction confinement and electronic screening in two-dimensional nanofluidic channels

7. Enhanced nanofluidic transport in activated carbon nanoconduits

8. Long-term memory and synapse-like dynamics in two-dimensional nanofluidic channels

9. Strong electronic winds blowing under liquid flows on carbon surfaces

10. Coupled interactions at the ionic graphene/water interface

11. Chemi-sorbed versus physi-sorbed surface charge and its impact on electrokinetic transport: carbon versus boron-nitride surface

12. Life on the osmotic slopes

13. Modeling of emergent memory and voltage spiking in ionic transport through angstr\'om-scale slits

14. Studying polymer diffusiophoresis with non-equilibrium molecular dynamics

15. Local and global force balance for diffusiophoretic transport

16. Nanotribology of Ionic Liquids: Transition to Yielding Response in Nanometric Confinement with Metallic Surfaces

17. Nanofluidics coming of age

18. Resonant osmosis across active switchable membranes

19. Mechanically activated ionic transport across single-digit carbon nanotubes

20. Fluids at the Nanoscale: from continuum to sub-continuum transport

21. Transport ionique non-linéaire aux échelles nanométrique and Ångströmétrique

22. Nonlinear ionic transport at the nanometric and Ångströmetric scales

23. Friction multi-échelles sur la glace et la neige

24. Adsorption Kinetics in Open Nanopores as a Source of Low-Frequency Noise

25. Atomic rheology of gold nanojunctions

26. Ionic Coulomb blockade as a fractional Wien effect

27. Two recipes for repelling hot water

28. MicroMegascope based dynamic Surface Force Apparatus

29. Ballistics of self-jumping microdroplets

30. Beyond the Tradeoff: Dynamic Selectivity in Ionic Transport and Current Rectification

31. Osmosis, from molecular insights to large-scale applications

32. Entrance effects in concentration-gradient-driven flow through an ultrathin porous membrane

33. Ultrafast photomechanical transduction through thermophoretic implosion

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33 results on '"Micromegas : Nano-Fluidique"'

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