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26 results on '"J.-F. Joanny"'

1. Marangoni transport in lipid nanotubes

Author

J. F. Joanny, F. Brochard-Wyart, Paul Dommersnes, Owe Orwar, Physico-Chimie-Curie (PCC), Centre National de la Recherche Scientifique (CNRS)-Institut Curie [Paris]-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut Curie [Paris]-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Physics::Biological Physics, 0303 health sciences, Materials science, Marangoni effect, Vesicle, General Physics and Astronomy, 02 engineering and technology, Mechanics, 021001 nanoscience & nanotechnology, Hagen–Poiseuille equation, Curvature, Physics::Fluid Dynamics, Condensed Matter::Soft Condensed Matter, Quantitative Biology::Subcellular Processes, Surface tension, 03 medical and health sciences, Membrane, Classical mechanics, Laplace pressure, 0210 nano-technology, Stationary state, 030304 developmental biology
Abstract

We give a simple picture of transient and stationary transport in lipid nanotubes connecting two vesicles, when a difference of membrane tension is imposed at time t = 0, either by pressing one vesicle with a micro-fiber, or by adding a surplus of membrane lipid. The net result is a transport of membrane from the tense towards the floppy vesicle. In the early stage, the tube remains cylindrical, and the gradient of surface tension gives rise to two opposite flows of the internal liquid: a Marangoni flow towards the direction of high tension, and a Poiseuille flow (induced by Laplace pressures) in the opposite direction. At longer time, the tube reaches a stationary state, where curvature and Laplace pressure are balanced. Marangoni flows dominate for giant vesicles, where Laplace pressure is negligible.

Published
2005

2. Charge relaxation in polyampholytes of various statistics

Author

A. Johner, J. F. Joanny, Samat Moldakarimov, Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), and Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Quantitative Biology::Biomolecules, Dynamic structure factor, Biophysics, Charge density, 02 engineering and technology, Surfaces and Interfaces, General Chemistry, Dielectric, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrostatics, 01 natural sciences, 0104 chemical sciences, Exponential function, Dipole, Statistics, General Materials Science, Soft matter, 0210 nano-technology, Structure factor, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], Biotechnology
Abstract

We discuss theoretically the relaxation of charge fluctuations in polyampholyte solutions. It has been shown previously by some of us (J. Wittmer et al. Europhys. Lett. 24, 263 (1993)) that the charge distribution along the polyampholyte backbone has a dramatic influence on the polarization energy and hence on the solubility. Here it is demonstrated that a similar effect exists for the charge relaxation. The charge relaxation mechanism qualitatively depends on the statistics: for alternating polyampholytes the relaxation is mainly due to local dipole inversion and is not primarily driven by electrostatic interactions, whereas for random polyampholytes it is driven by electrostatic interactions. Intermediate statistics (with short-ranged (exponential) correlations) appear as a combination of these two limiting cases: short-wavelength modes are insensitive to the loss of correlations along the backbone, whereas long-wavelength modes correspond to a random statistics with renormalized charges. The relaxation of the dielectric constant is also calculated.

Published
2003

3. Self-assembled layers under flow: Stabilization by chain end exchange

Author

J.-F. Joanny, Franck Clement, Thierry Charitat, A. Johner, Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), and Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
chemistry.chemical_classification, Materials science, 010304 chemical physics, General Physics and Astronomy, Thermal fluctuations, 02 engineering and technology, Polymer, Mechanics, 021001 nanoscience & nanotechnology, 01 natural sciences, Condensed Matter::Soft Condensed Matter, Physics::Fluid Dynamics, Shear (geology), chemistry, Deflection (engineering), Electromagnetic coil, 0103 physical sciences, Copolymer, Shear stress, 0210 nano-technology, Shear flow, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], ComputingMilieux_MISCELLANEOUS
Abstract

In previous theories of sheared grafted polymer layers, the chain configurations are stationary. Formally, the shear stress is thus always supported by the same chains. These models predict that the response to the flow (in plane tension at the wall, free end deflection) is larger than the thermodynamic fluctuations for Deborah numbers De 1. Here we take into account the exchange of the chain configurations so that an individual chain on average does not support the shear stress long enough to reach a steady-state configuration. This effect smears out the response to flow over a larger number of chains, those with ends within one coil radius from the edge. The response only reaches the magnitude of the thermal fluctuations for De = 1. This corresponds in practice to shear rates as high as several 104s−1. Recent experiments by Baker et al. indeed show that self-assembled copolymer layers are very stable against steady shear flow, shear-induced desorption is only detected for De ~ 1.

Published
2001

4. Formation of hairpins and band broadening in gel electrophoresis of DNA

Author

J.-F. Joanny, A. N. Semenov, Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), and Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Gel electrophoresis, Materials science, Chromatography, Gel electrophoresis of nucleic acids, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, chemistry.chemical_compound, chemistry, 0103 physical sciences, Pulsed-field gel electrophoresis, 010306 general physics, 0210 nano-technology, DNA
Published
1997

5. Shear-Induced Micellization of Diblock Copolymers

Author

J. L. Jones, J.-F. Joanny, Carlos M. Marques, Joanny, Jean-François, Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), University of Leeds, Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), and Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Aggregation number, Polymers and Plastics, Chemistry, media_common.quotation_subject, Organic Chemistry, Thermodynamics, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Asymmetry, Micelle, [PHYS] Physics [physics], 0104 chemical sciences, Inorganic Chemistry, Shear (geology), Critical micelle concentration, Materials Chemistry, Copolymer, Organic chemistry, 0210 nano-technology, Shear flow, ComputingMilieux_MISCELLANEOUS, media_common
Abstract

The influence of a weak shear flow on the micellization of diblock copolymers in selective solvents is investigated. The micelles are described as small microgel beads and the hydrodynamic fields calculated within the Brinkman approximation. The critical micellar concentration is shown to decrease in the shear flow, leading to the possibility of shear-induced micellization. It is also shown that the aggregation number of the micelles is modified by the flow: it increases for micelles with a large asymmetry but decreases for more symmetric micelles

Published
1995

6. Hydrodynamic modes of viscoelastic soap films

Author

J.-F. Joanny, Carlos M. Marques, Pierre Sens, Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), and Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
business.industry, Chemistry, 02 engineering and technology, Surfaces and Interfaces, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Viscoelasticity, Optics, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Dispersion relation, 0103 physical sciences, Electrochemistry, General Materials Science, Soap film, Composite material, 010306 general physics, 0210 nano-technology, business, Elastic modulus, ComputingMilieux_MISCELLANEOUS, Spectroscopy
Abstract

International audience

Published
1993

7. Dynamics of polymeric brushes: End exchange and bridging kinetics

Author

J. F. Joanny, A. Johner, Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), and Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], chemistry.chemical_classification, Quantitative Biology::Biomolecules, Chemistry, Stereochemistry, Kinetics, Theta solvent, General Physics and Astronomy, 02 engineering and technology, Polymer, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Condensed Matter::Soft Condensed Matter, Solvent, Adsorption, Mean field theory, Chemical physics, Relaxation (physics), Physics::Chemical Physics, Physical and Theoretical Chemistry, Solvent effects, 0210 nano-technology
Abstract

We study some dynamical aspects of grafted polymer layers in a solvent. The structure of the brush is described in a θ solvent by the self‐consistent mean field theory and in a good solvent using scaling laws. The Rouse–Zimm model including hydrodynamic interactions is used for the dynamic properties. A given chain end explores the entire thickness of a free grafted layer in a time Te proportional to the cube of the thickness. The exploration time is much larger than the Rouse time that characterizes the relaxation of the fluctuations of the chains conformations. In a θ‐solvent we give a detailed study of the relaxation of the density of a few labeled chain ends towards its equilibrium value. The bridging kinetics between a grafting plate and a plate adsorbing the free ends is also discussed. When adsorption proceeds, an exclusion zone grows in the vicinity of the adsorbing plate. To cross the exclusion zone and adsorb, a chain end must overcome an energy barrier. The typical adsorption time is the first ...

Published
1993

8. Depletion of ideal polymer chains near a spherical colloid particle beyond the Dirichlet boundary conditions

Author

Albert Johner, Igor Erukhimovich, J. F. Joanny, Physico-Chimie-Curie (PCC), Centre National de la Recherche Scientifique (CNRS)-Institut Curie [Paris]-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut Curie [Paris]-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Models, Molecular, Polymers, Molecular Conformation, Biophysics, 02 engineering and technology, 01 natural sciences, Gyration, Spherical geometry, symbols.namesake, Colloid, 0103 physical sciences, Computer Simulation, General Materials Science, Colloids, Particle Size, 010306 general physics, Dirichlet problem, Physics, [PHYS]Physics [physics], Mathematical analysis, Surfaces and Interfaces, General Chemistry, 021001 nanoscience & nanotechnology, Integral equation, Bond length, Condensed Matter::Soft Condensed Matter, Models, Chemical, Dirichlet boundary condition, symbols, Radius of gyration, 0210 nano-technology, Biotechnology
Abstract

We reconsider the depletion interaction of an ideal polymer chain, characterized by the gyration radius R(G) and bond length a , and an impenetrable spherical colloid particle of radius R . Forbidding the polymer-colloid penetration explicitly (by the use of Mayer functions) without any other requirement we derive and solve analytically an integral equation for the chain partition function of a long ideal polymer chain for the spherical geometry. We find that the correction to the solution of the Dirichlet problem depends on the ratios R/R (G) and R/a . The correction vanishes for the continuous chain model (i.e. in the limit R/R (G) --> 0 and R/a --> infinity but stays finite (even for an infinite chain) for the discrete chain model. The correction can become substantial in the case of nano-colloids (the so-called protein limit).

Published
2010

9. Shape optimization in lipid nanotube networks

Author

Owe Orwar, Paul Dommersnes, Tatsiana Lobovkina, S. Tiourine, J. F. Joanny, Physico-Chimie-Curie (PCC), Centre National de la Recherche Scientifique (CNRS)-Institut Curie [Paris]-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut Curie [Paris]-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Surface (mathematics), Optimization problem, Similarity (geometry), Computer science, Surface Properties, Biophysics, 02 engineering and technology, Topology, Steiner tree problem, 03 medical and health sciences, symbols.namesake, General Materials Science, Shape optimization, 030304 developmental biology, Self-organization, [PHYS]Physics [physics], 0303 health sciences, Nanotubes, Plane (geometry), Surfaces and Interfaces, General Chemistry, 021001 nanoscience & nanotechnology, Lipids, Terminal (electronics), Microscopy, Fluorescence, Liposomes, symbols, Thermodynamics, 0210 nano-technology, Biotechnology
Abstract

Starting from a high surface free-energy state, lipid nanotube networks are capable to self-organize into tree-like structures with particular geometrical features. In this work we analyze the process of self-organization in such networks, and report a strong similarity to the Euclidian Steiner Tree Problem (ESTP). ESTP is a well-known NP-hard optimization problem of finding a network connecting a given set of terminal points on a plane, allowing addition of auxiliary points, with the overall objective to minimize the total network length. The present study shows that aggregate lipid structures self-organize into geometries that correspond to locally optimal solutions to such problems.

Published
2008

10. Refined contour analysis of giant unilamellar vesicles

Author

J. F. Joanny, Patricia Bassereau, Jacques Prost, Jacques Pecreaux, Hans-Günther Döbereiner, Physico-Chimie-Curie (PCC), Centre National de la Recherche Scientifique (CNRS)-Institut Curie [Paris]-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut Curie [Paris]-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Time delay and integration, Macromolecular Substances, Membrane Fluidity, Lipid Bilayers, Molecular Conformation, Biophysics, 02 engineering and technology, Bending, 01 natural sciences, Pattern Recognition, Automated, Quantitative Biology::Subcellular Processes, symbols.namesake, Nuclear magnetic resonance, Planar, Image Interpretation, Computer-Assisted, 0103 physical sciences, Surface Tension, General Materials Science, 010306 general physics, Fluctuation spectrum, Physics, [PHYS]Physics [physics], Microscopy, Fourier Analysis, Plane (geometry), Membranes, Artificial, Signal Processing, Computer-Assisted, Surfaces and Interfaces, General Chemistry, Elasticity (physics), 021001 nanoscience & nanotechnology, Egg Yolk, Elasticity, Computational physics, Membrane, Fourier analysis, Liposomes, Phosphatidylcholines, symbols, 0210 nano-technology, Algorithms, Biotechnology
Abstract

The fluctuation spectrum of giant unilamellar vesicles is measured using a high-resolution contour detection technique. An analysis at higher q vectors than previously achievable is now possible due to technical improvements of the experimental setup and of the detection algorithm. The global fluctuation spectrum is directly fitted to deduce the membrane tension and the bending modulus of lipid membranes. Moreover, we show that the planar analysis of fluctuations is valid for spherical objects, even at low wave vectors. Corrections due to the integration time of the video camera and to the section of a 3D object by the observation plane are introduced. A precise calculation of the error bars has been done in order to provide reliable error estimate. Eventually, using this technique, we have measured bending moduli for EPC, SOPC and SOPC: CHOL membranes confirming previously published values. An interesting application of this technique can be the measurement of the fluctuation spectra for non-equilibrium membranes, such as "active membranes".

Published
2004

11. Stress Relaxation in Telechelic Gels. 1. Sticker Extraction

Author

A. Johner, J.-F. Joanny, F. Clement, Alexander N. Semenov, Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), University of Leeds, Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Joanny, Jean-François

Subjects
[PHYS]Physics [physics], Materials science, Aggregate (composite), Polymers and Plastics, Tension (physics), Organic Chemistry, Extraction (chemistry), Thermodynamics, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Curvature, 01 natural sciences, [PHYS] Physics [physics], 0104 chemical sciences, Inorganic Chemistry, Chain (algebraic topology), Polymer chemistry, Materials Chemistry, Stress relaxation, Copolymer, Nonlinear rheology, 0210 nano-technology
Abstract

Publisher: American Chemical Society; International audience; We discuss the nonlinear rheology of telechelic gels formed by triblock copolymers with short hydrophobic end blocks (the stickers). In this first paper, we merely study the variation of the extraction time of a sticker from a hydrophobic aggregate with the chain tension. Using a model potential that binds the sticker/chain junction point to the aggregate/water interface, we explicitly show that the extraction time only depends on the chain tension at the junction point. The results are extended to more realistic potentials by heuristic arguments. At this level of description various effects (curvature of the aggregate, sticker flexibility, impenetrable aggregate constraint) can also be accounted for.

Published
2000

12. Adsorption of Neutral Polymers : Interpretation of the Numerical Self-Consistent Field Results

Author

J. Bonet-Avalos, A. N. Semenov, J. F. Joanny, A. Johner, C. C. van der Linden, Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Universitat de Barcelona (UB), and Wageningen Agricultural University

Subjects
chemistry.chemical_classification, [PHYS]Physics [physics], Polymers and Plastics, Field (physics), Organic Chemistry, Mineralogy, Thermodynamics, 02 engineering and technology, Polymer, Self consistent, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Interpretation (model theory), Inorganic Chemistry, Condensed Matter::Soft Condensed Matter, Adsorption, chemistry, Mean field theory, Materials Chemistry, Chemical solution, Absorption (chemistry), 0210 nano-technology
Abstract

International audience; We use results on polymer absorption obtained from a recent mean-field theory with two order parameters to interpret numerical results of the Scheutjens and Fleer approach. An extension of the analytical theory accounting for the local swelling of the polymer is also presented and discussed.

Published
1996

13. Scattering by linear, branched, and copolymer chain molecules for large scattering vectors

Author

G. Hadziioannou, J. F. Joanny, B. Hammouda, H. Benoit, Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), University of Groningen [Groningen], National Institute of Standards and Technology [Gaithersburg] (NIST), Joanny, Jean-François, Stratingh Institute of Chemistry, Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), and Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Polymers and Plastics, Dispersity, 02 engineering and technology, Degree of polymerization, Neutron scattering, 010402 general chemistry, 01 natural sciences, Molecular physics, ANGLE NEUTRON-SCATTERING, [PHYS] Physics [physics], Inorganic Chemistry, Chain (algebraic topology), Polymer chemistry, Materials Chemistry, Copolymer, Molecule, MACROMOLECULES, ComputingMilieux_MISCELLANEOUS, chemistry.chemical_classification, [PHYS]Physics [physics], Quantitative Biology::Biomolecules, Chemistry, Scattering, Organic Chemistry, Polymer, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Condensed Matter::Soft Condensed Matter, MODEL, 0210 nano-technology
Abstract

If one expands the expression of the intensity scattered by polymers or copolymers in the large q range, one observes that, for Gaussian chains, this intensity follows a law of the type i(q) = Aq-2 + Bq-4. The coefficient A characterizes the length of the statistical element, and the coefficient B is easily measured using the Zimm representation. For a linear chain B gives the number-average degree of polymerization. In the case of branched polymers without loops, it depends mainly on the number of statistical elements between two cross-links or one cross-link and an end. If the polymer is sufficiently long, it gives the number-average degree of polymerization of these branches. A general formula is given and applied to classical examples: star, alternating, a comblike copolymer. The effect of polydispersity and the case of block copolymers with blocks of different chemical nature are discussed. These results are also extended to stretched polymers. This method could give new information in the interpretation of neutron scattering data.

Published
1993

14. Static properties of polysoaps in dilute solution

Author

M. S. Turner, J. F. Joanny, Joanny, Jean-François, Cavendish Laboratory, University of Cambridge [UK] (CAM), Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), and Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
chemistry.chemical_classification, [PHYS]Physics [physics], Aqueous solution, Stereochemistry, Chemistry, General Engineering, 02 engineering and technology, Polymer, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Micelle, 3. Good health, 0104 chemical sciences, [PHYS] Physics [physics], Chemical physics, Intramolecular force, Side chain, Molecule, Physical and Theoretical Chemistry, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS, Repeat unit, Phase diagram
Abstract

Polysoaps are polyelectrolytic comblike polymers with insoluble side chains. In aqueous solution, at any concentration, the side chains may assemble to form intramolecular hydrophobic domains very similar to the micelles formed by simple surfactants. Using appropriate estimates for the free energies of various intramolecular structures, we discuss their relative stability. We find that dense intramolecular domains, consisting of more than one molecular repeat unit, exist whenever the side chains are long enough. In this case the conformation where the entire molecule forms a single dense cylindrical domain (resembling a wormlike micelle) is more stable than the necklace of micelle conformation where many spherical domains (resembling spherical micelles) are distributed along the molecule

Published
1993

15. Dynamics of concentration fluctuations in ternary polymer solutions

Author

F. Roby, J. F. Joanny, Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Joanny, Jean-François

Subjects
chemistry.chemical_classification, [PHYS]Physics [physics], Polymers and Plastics, Chemistry, Organic Chemistry, Dynamics (mechanics), Relaxation (NMR), Binary number, Thermodynamics, 02 engineering and technology, Polymer, Composition (combinatorics), 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, [PHYS] Physics [physics], Condensed Matter::Soft Condensed Matter, Inorganic Chemistry, Solvent, Relaxation rate, Materials Chemistry, 0210 nano-technology, Ternary operation, ComputingMilieux_MISCELLANEOUS
Abstract

The relaxation of concentration fluctuations in symmetric ternary solutions of two polymers of the same molecular weight at the same concentration in a common good solvent is discussed. The correlations of total concentration and of composition are decoupled, and the two relaxation modes are a pure cooperative mode and a pure interdiffusion mode. The relaxation time of the cooperative mode is the same as for a binary polymer solution at the same concentration. The interdiffusion relaxation rate can be written as the sum of a hydrodynamic contribution and of a contribution due to the friction of the blobs on their environment

Published
1992

16. Diblock copolymer lamellae at rough surfaces

Author

J. F. Joanny, Matthew S. Turner, Cavendish Laboratory, University of Cambridge [UK] (CAM), Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Joanny, Jean-François

Subjects
Materials science, Polymers and Plastics, 02 engineering and technology, Substrate (electronics), Surface finish, 010402 general chemistry, 01 natural sciences, [PHYS] Physics [physics], Inorganic Chemistry, Polymer chemistry, Materials Chemistry, Copolymer, Lamellar structure, Composite material, ComputingMilieux_MISCELLANEOUS, chemistry.chemical_classification, [PHYS]Physics [physics], Organic Chemistry, Polymer, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Lamella (surface anatomy), chemistry, Free surface, 0210 nano-technology, Layer (electronics)
Abstract

The behavior of a diblock copolymer lamellar layer, in the melt, assembled at a substrate with a small-amplitude periodic roughness, characterized by a wavevector q, is studied. The polymer configurations are described using the Alexander-de Gennes model of polymer brushes. For a single lamella of thickness h, at small wavevectors (qh q c , the undulation of the free surface has a sign opposite to that of the solid surface.

Published
1992

17. Block copolymer adsorption in a selective solvent : a kinetic study

Author

A. Johner, J. F. Joanny, Joanny, Jean-François, Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), and Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Polymers and Plastics, Chemistry, Organic Chemistry, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Kinetic energy, 01 natural sciences, 0104 chemical sciences, [PHYS] Physics [physics], Inorganic Chemistry, Solvent, Adsorption, Materials Chemistry, Copolymer, Organic chemistry, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

Etude theorique de la cinetique d'adsorption sur une paroi de copolymeres bisequences en solution micellaire dans un solvant selectif d'une des sequences

Published
1990

18. Contact Angle Hysteresis on Random Surfaces

Author

Mark O. Robbins, J. F. Joanny, Laboratoire de physique de l'ENS, École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)

Subjects
[PHYS]Physics [physics], Random field, Materials science, Condensed matter physics, business.industry, General Physics and Astronomy, Magnitude (mathematics), 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Contact angle, Gravitation, Hysteresis, Optics, Capillary length, 0103 physical sciences, Wetting, 010306 general physics, 0210 nano-technology, business, Characteristic energy
Abstract

Contact angle hysteresis on weakly heterogeneous surfaces is studied using an extension of Imry and Ma's analysis of the random field problem. Deformations of the liquid-vapor interface in response to the heterogeneity are characterized by a length Ld which increases as the magnitude of the heterogeneity decreases. The characteristic energy associated with these deformations is used to find the scale of contact angle hysteresis. In the absence of gravity, contact angle hysteresis occurs for arbitrarily weak heterogeneity. Hysteresis disappears when Ld exceeds the gravitational capillary length, while systems with characteristic size less than Ld show increased hysteresis.

Published
1987

19. Dynamics of Semiflexible Polymers in Solution

Author

Philip Pincus, Dale W. Schaefer, J. F. Joanny, Laboratoire de Physique de la Matière Condensée (LPMC), and Collège de France (CdF (institution))-Centre National de la Recherche Scientifique (CNRS)

Subjects
chemistry.chemical_classification, [PHYS]Physics [physics], Materials science, Polymers and Plastics, Polymer science, Organic Chemistry, Dynamics (mechanics), 02 engineering and technology, Polymer, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Inorganic Chemistry, chemistry, Materials Chemistry, 0210 nano-technology
Published
1980

20. Buckling of Langmuir Monolayers

Author

Philip Pincus, Scott T. Milner, J.-F. Joanny, AT&T Bell Laboratories, Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Lyon (ENS Lyon), University of California [Santa Barbara] (UCSB), University of California, Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure de Lyon (ENS de Lyon), University of California [Santa Barbara] (UC Santa Barbara), University of California (UC), and Joanny, Jean-François

Subjects
[PHYS]Physics [physics], Langmuir, Materials science, General Physics and Astronomy, 02 engineering and technology, 021001 nanoscience & nanotechnology, Curvature, 01 natural sciences, [PHYS] Physics [physics], Capillary length, Buckling, Pulmonary surfactant, 0103 physical sciences, Monolayer, Composite material, 010306 general physics, 0210 nano-technology, Dissolution, Beam (structure), ComputingMilieux_MISCELLANEOUS
Abstract

We show that under compression on a Langmuir trough, a surfactant monolayer may have a mechanical instability similar to the buckling instability of a beam or a plate. In the buckled state, the wavelength of the surface undulations is the capillary length resulting from the balance between gravity and curvature energy and is in the range of 104 A. For the specific example of block copolymer surfactants, we discuss the competition between the buckling instability and dissolution of the surfactant in the supporting liquid.

Published
1989

21. Kinetics of Spreading : Hele–Shaw Cell with Open Boundaries

Author

J F Joanny, Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Joanny, Jean-François, Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Materials science, Solid surface, Kinetics, Thermodynamics, 02 engineering and technology, Mechanics, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Instability, Wedge (geometry), Atomic and Molecular Physics, and Optics, [PHYS] Physics [physics], Condensed Matter::Soft Condensed Matter, Physics::Fluid Dynamics, Hele-Shaw flow, 0103 physical sciences, 010306 general physics, 0210 nano-technology, Mathematical Physics
Abstract

We briefly review the basic principles governing the spreading of a simple liquid on a solid surface. If the liquid completely wets the solid surface, the macroscopic wedge is preceded by a microscopic precursor film. If the liquid incompletely wets the solid surface, the heterogeneities of this surface play a major role. These results are applied to study the Rayleigh–Taylor instability in a Hele–Shaw cell with open boundaries.

Published
1989

22. On the overdamping of longitudinal acoustic modes in metal-molten salt solutions

Author

J F Joanny, Gilles Chabrier, Laboratoire de physique de l'ENS, École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)

Subjects
Free electron model, Physics, [PHYS]Physics [physics], Range (particle radiation), General Engineering, Mode (statistics), General Physics and Astronomy, 02 engineering and technology, Mechanics, Electron, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Charged particle, Metal, Wavelength, Classical mechanics, visual_art, 0103 physical sciences, visual_art.visual_art_medium, Molten salt, 010306 general physics, 0210 nano-technology
Abstract

The authors analyse long-wavelength collective modes in the very salt-rich side of metal-salt solutions, using linearised hydrodynamics equations. In the present model, all the free electrons are assumed to be massive charged particles. The comparison between the present model and the rigid-electron background model developed in their previous paper yields two interesting results: the appearance of a central nonthermal diffusive mode and the persistence of sound wave propagation at long wavelengths over the whole concentration range. It is important to mention that, even if this model seems rather an odd one for considering the dynamics of metal-salt solutions, it is directly applicable to any mixture of molten salts with the same cation, one of the anions thus playing the role of the electrons.

Published
1987

23. Complete Wetting on Rough Surfaces : Statics

Author

J.-F. Joanny, Mark O. Robbins, David Andelman, Laboratoire de physique de l'ENS, École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)

Subjects
[PHYS]Physics [physics], Materials science, Condensed matter physics, Scattering, Disjoining pressure, General Physics and Astronomy, Physics::Optics, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Surface tension, Condensed Matter::Soft Condensed Matter, symbols.namesake, Wavelength, Classical mechanics, Ellipsometry, 0103 physical sciences, symbols, Wetting, van der Waals force, 010306 general physics, 0210 nano-technology, Statics
Abstract

We study the profile of a thin liquid film completely wetting a rough solid surface. The long-wavelength undulations of the liquid interface follow those of the solid surface, while short-wavelength undulations are strongly damped. There is Lorentzian damping of wavelengths smaller than the healing length ξ determined by a balance between surface tension and disjoining pressure. Undulations with wavelength smaller than the mean film thickness e are exponentially damped. We study in detail the case where the binary interactions between molecules may be described by an inverse power law potential such as the Van der Waals potential. These results are relevant for recent ellipsometry and grazing incidence x-ray scattering experiments.

Published
1988

24. MEMBRANE CURVATURE ELASTICITY IN WEAKLY CHARGED LAMELLAR PHASES

Author

J.-F. Joanny, David Andelman, Carlos M. Marques, James L. Harden, Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Tel Aviv University [Tel Aviv], Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Tel Aviv University (TAU), and Joanny, Jean-François

Subjects
Length scale, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Molecular physics, [PHYS] Physics [physics], Membrane bending, Optics, Electrochemistry, General Materials Science, Lamellar structure, Surface charge, ComputingMilieux_MISCELLANEOUS, Spectroscopy, [PHYS]Physics [physics], business.industry, Chemistry, Charge density, Surfaces and Interfaces, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Electrostatics, 0104 chemical sciences, Condensed Matter::Soft Condensed Matter, Membrane, Electric potential, 0210 nano-technology, business
Abstract

We study the effect of electrostatic interactions on the membrane bending energies of weakly charged, swollen, lamellar phases of surfactant solutions. We treat the surface charge density of the lamellae as a constant and consider only situations where it is low enough so that the distance 2d between lamellae is the smallest relevant length scale in the problem. In the presence of salt (the short-distance DebyeHuckel regime) we show that the electrostatic contribution to the bending energy of a membrane is in general small, in disagreement with a previous result, is proportional to d3, and is independent of ionic strength. Identical results are obtained for membranes undulating sinusoidally in phase and for concentric cylindrical membranes. The bending constant is also calculated for membranes held at constant electric potential and is compared to the constant charge density case. In the absence of salt, continuity arguments predict an electrostatic contribution to the bending energy that scales as d3. Furthermore, a direct calculation for concentric cylindrical membranes gives exactly the same scaling behavior (including the numerical prefactor) as in the presence of salt.

25. Structure of adsorbed polymer layers: Loops and tails

Author

J. Bonet Avalos, A. N. Semenov, A. Johner, J. F. Joanny, and C. C. Linden

Subjects
010304 chemical physics, 0103 physical sciences, 02 engineering and technology, 021001 nanoscience & nanotechnology, 0210 nano-technology, 01 natural sciences

26. Polyelectrolyte Theory

Author

C. Holm, J. F. Joanny, K. Kremer, R. R. Netz, P. Reineker, C. Seidel, T. A. Vilgis, and R. G. Winkler

Subjects
010304 chemical physics, 0103 physical sciences, 02 engineering and technology, 021001 nanoscience & nanotechnology, 0210 nano-technology, 01 natural sciences

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