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1. The effect of boiling in a thermosyphon on surface tension and contact angle of silica and graphene oxide nanofluids

Author

Robert Mulka, Samah Hamze, Bartosz Zajaczkowski, Matthias H. Buschmann, Patrice Estellé, Gaweł Żyła, A. Kujawska, Wroclaw University of Science and Technology, Laboratoire de Génie Civil et Génie Mécanique (LGCGM), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Rzeszow University of Technology, Nanouptake Cost Action 15119: Overcoming Barriers to Nanofluids Market Uptake and STSM Grants Ref. COST-STSM- CA15119-45026, and CA15119-46347. National Science Centre Poland: grant no 2016/23/N/ST8/00252, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)

Subjects
Materials science, 020209 energy, 02 engineering and technology, law.invention, Surface tension, Contact angle, boiling, [SPI]Engineering Sciences [physics], Colloid and Surface Chemistry, Nanofluid, Pulmonary surfactant, law, Boiling, 0202 electrical engineering, electronic engineering, information engineering, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], Composite material, contact angle, Graphene, silica nanofluid, 021001 nanoscience & nanotechnology, graphene oxide nanofluid, thermosyphon, Heat transfer, [PHYS.MECA.THER]Physics [physics]/Mechanics [physics]/Thermics [physics.class-ph], Wetting, 0210 nano-technology
Abstract

International audience; Thermosyphons are heat transfer devices characterized by high efficiency due to simultaneous phase changes occurring in the evaporation-condensation cycle of working fluid. One of the most promising solutions to enhance their heat transfer capacity of the device is the use of nanofluids – suspensions of particles with at least one dimension below 100 nm. It was determined that nanofluid does not influence the work of thermosyphons condenser section and the focus should be put on the boiling process in the evaporator section. During boiling, nanoparticles tend to deposit on the heater’s surface, what alters characteristics of this surface and near surface hydrodynamics. This changes the appearance of nanofluid, but the precise effect on how the deposition of particles affects the properties of nanofluid is unknown. Changes in surface tension and wettability affect boiling regimes (e.g. reduced surface tension reduces the size of departing bubbles and inhibits geysering), and efficiency of heat transfer through the device. Understanding of those parameters is crucial for the development of appropriate models describing heat transfer in thermosyphon working with nanofluids. The main goal of this study is to determine surface tension and contact angle of nanofluids based on silica nanoparticles and nano-sized graphene oxide flakes before and after the experimental boiling cycle in the thermosyphon. Results show that, in comparison with water, silica nanofluid (2 vol.%) is characterized by lower surface tension and contact angles on both analysed surfaces. After-use silica nanofluid exhibited noticeably higher averaged surface tension and smaller contact angles in comparison to the fresh working medium. The change was most likely due to the decreased concentration caused by the deposition of nanoparticles during the thermosyphon operation. Still, the differences between before-use and after-use samples were smaller than the measurement uncertainties. Before-use graphene oxide nanofluid already showed surface tension and contact angle similar to water due to low concentration of graphene flakes (0.1 g/L). Consequently, the properties of after-use graphene oxide fluid were also not much different from water. Additional measurements of surface tension for graphene oxide nanofluid with and without addition of sodium dodecyl sulfate surfactant allowed to differentiate the effects caused by graphene flakes and surfactant. The surfactant reduced the surface tension of the nanofluid, but the change was smaller than in case of surfactant addition to pure water.

Published
2021
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2. Thermal and Physical Characterization of PEG Phase Change Materials Enhanced by Carbon-Based Nanoparticles

Author

Gaweł Żyła, Samah Hamze, Marco A. Marcos, David Cabaleiro, Jacek Fal, Patrice Estellé, University of Vigo [ Pontevedra], Laboratoire de Génie Civil et Génie Mécanique (LGCGM), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Rzeszow University of Technology, Universidade de Vigo, Research was partially supported by EU COST Action CA15119: Overcoming Barriers to Nanofluids Market Uptake. David Cabaleiro was a recipient of a postdoctoral fellowship from Xunta de Galicia (Spain) and acknowledges EU COST for the STSM Grant Ref. COST-STSM-CA15119-42918. Samah Hamze acknowledges EU COST for the STMS grant ref. COST-STSM-CA15119-45590. Marco Antonio Marcos acknowledges EU COST for the STMS grant ref. COST-STSM-CA15119-45123. Patrice Estellé acknowledges the European Union through the European Regional Development Fund (ERDF), the Ministry of Higher Education and Research and the French region of Brittany and Rennes Métropole for the financial support of surface tension experimental device. This work was also supported by the Ministerio de Economía y Competitividad (Spain) and FEDER program through ENE2017-86425-C2-1-R project., Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)

Subjects
nano-diamond, Materials science, PEG400, carbon black, 020209 energy, General Chemical Engineering, chemistry.chemical_element, 02 engineering and technology, engineering.material, Article, [SPI.MAT]Engineering Sciences [physics]/Materials, Surface tension, lcsh:Chemistry, Nanofluid, Differential scanning calorimetry, Thermal conductivity, 2213.02 Física de la Transmisión del Calor, 2210.18 Física del Estado Liquido, surface tension, 0202 electrical engineering, electronic engineering, information engineering, General Materials Science, thermal conductivity, Graphite, density, graphite, Diamond, Carbon black, 021001 nanoscience & nanotechnology, solid-liquid phase change, NePCM, chemistry, Chemical engineering, lcsh:QD1-999, 2303.12 Grafito, engineering, [SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph], dynamic viscosity, 0210 nano-technology, Carbon
Abstract

This paper presents the preparation and thermal/physical characterization of phase change materials (PCMs) based on poly(ethylene glycol) 400 g&middot, mol&minus, 1 and nano-enhanced by either carbon black (CB), a raw graphite/diamond nanomixture (G/D-r), a purified graphite/diamond nanomixture (G/D-p) or nano-Diamond nanopowders with purity grades of 87% or 97% (nD87 and nD97, respectively). Differential scanning calorimetry and oscillatory rheology experiments were used to provide an insight into the thermal and mechanical changes taking place during solid-liquid phase transitions of the carbon-based suspensions. PEG400-based samples loaded with 1.0 wt.% of raw graphite/diamond nanomixture (G/D-r) exhibited the lowest sub-cooling effect (with a reduction of ~2 K regarding neat PEG400). The influences that the type of carbon-based nanoadditive and nanoparticle loading (0.50 and 1.0 wt.%) have on dynamic viscosity, thermal conductivity, density and surface tension were also investigated in the temperature range from 288 to 318 K. Non-linear rheological experiments showed that all dispersions exhibited a non-Newtonian pseudo-plastic behavior, which was more noticeable in the case of carbon black nanofluids at low shear rates. The highest enhancements in thermal conductivity were observed for graphite/diamond nanomixtures (3.3&ndash, 3.6%), while nano-diamond suspensions showed the largest modifications in density (0.64&ndash, 0.66%). Reductions in surface tension were measured for the two nano-diamond nanopowders (nD87 and nD97), while slight increases (within experimental uncertainties) were observed for dispersions prepared using the other three carbon-based nanopowders. Finally, a good agreement was observed between the experimental surface tension measurements performed using a Du No&uuml, y ring tensiometer and a drop-shape analyzer.

Published
2020
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3. Current trends in surface tension and wetting behavior of nanofluids

Author

S. M. Sohel Murshed, Gaweł Żyła, David Cabaleiro, Luis Lugo, Patrice Estellé, Laboratoire de Génie Civil et Génie Mécanique (LGCGM), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Dipartimento Fisica Aplicada (DPTO FISICA APLICADA), Universidad de Huelva, Rzeszow University of Technology, EGU, European Geosciences Union, COST-STSM-CA15119-34906, COST-STSM-CA15119-35961, MESR, Ministère de l'Education Nationale, de l'Enseignement Superieur et de la Recherche, CA15119, COST, European Cooperation in Science and Technology, Xunta de Galicia, FEDER, European Regional Development Fund, ENE2014-55489-C2-2-R, FEDER, Federación Española de Enfermedades Raras, Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)

Subjects
Materials science, Surface tension, Nanoparticle influence, Renewable Energy, Sustainability and the Environment, Nanoparticle, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Nanomaterials, Nanofluids, [SPI]Engineering Sciences [physics], Effect of temperature, Nanofluid, Pulmonary surfactant, Heat transfer, Wettability, Wetting, Composite material, 0210 nano-technology, Dispersion (water waves)
Abstract

International audience; Nanofluids are recent nanomaterials with improved thermophysical properties that could enhance the efficiency and reliability of heat transfer systems. Relevant properties for heat transfer calculation, thin film flows, droplet impingements or microfluidic are surface tension and wettability. However, to date, the understanding of those properties in nanofluids field is at the beginning compared to transport properties. At this stage, this review focus on the effect of nanoparticles and base fluid nature, temperature, use of surfactant, nanoparticle concentration, size and shape as well on the surface tension and wettability of nanofluids. After the presentation of heat transfer processes involving the influence of surface tension and wettability, this paper is organized according to the nature of the nanoparticles dealing with oxide, carbon-based and metallic nanofluids as well as unusual or less considered nature of nanoparticles. The factors affecting the surface tension of nanofluids are relatively well identified, but concentration and surfactant effects present some inconsistent outcomes. In any case, the dispersion of nanoparticles have an effect on the surface tension of base fluid significantly lower than that on transport properties. Based on results available in the literature and existing empirical correlations, a comprehensive assessment, challenges and future works are suggested. © 2018 Elsevier Ltd

Published
2018
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4. Optical and thermal properties of Sb/Bi-modified mixed Ge-Ga-Se-Te glasses

Author

Andrzej Kozdras, Ya. Shpotyuk, J. Szlęzak, Catherine Boussard-Plédel, Bruno Bureau, T. Hodge, Roman Golovchak, Austin Peay State University, University of Technology (Opole), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Rzeszow University of Technology, DMR-1409160, NSF, National Stroke Foundation, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Thermodynamics, 02 engineering and technology, Activation energy, 01 natural sciences, DSC, law.invention, Crystallization kinetics, Differential scanning calorimetry, law, 0103 physical sciences, Thermal, Materials Chemistry, [CHIM]Chemical Sciences, Thermal stability, Crystallization, 010306 general physics, Optical properties, Mechanical Engineering, Metals and Alloys, 021001 nanoscience & nanotechnology, Kinetics, Mechanics of Materials, Chalcogenide glass, Exponent, 0210 nano-technology
Abstract

International audience; The non-isothermal crystallization kinetics of novel BixGa5Ge20Sb10-xSe45Te20 (x = 1,3,5,10) glasses are studied with differential scanning calorimetry method, and analyzed using Frazer-Suzuki fitting function. The applicability of Johnson-Mehl-Avrami (JMA) model to describe the crystallization kinetics in these materials is verified, and JMA exponent is determined for the relevant crystallization processes. It is found, that substitution of Sb with Bi in glass composition leads to a decrease in optical gap and thermal stability of the glass, and increase in the density and crystallization activation energy for glass-ceramics formation.

Published
2018
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5. Skills management in the optimization of aircraft maintenance processes

Author

Dmitry I. Arkhipov, R. M. Chandima Ratnayake, Dorota Stadnicka, Olga Battaïa, Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE), Rzeszow University of Technology - PLZ (POLAND), Trapeznikov Institute of Control Sciences (RUSSIA), and University of Stavanger - UIS (NORWAY)

Subjects
Optimization, Service (business), 0209 industrial biotechnology, 021103 operations research, Scheduling, Airworthiness, Process (engineering), Computer science, 0211 other engineering and technologies, 02 engineering and technology, Maintenance processes, Skills management, 020901 industrial engineering & automation, Quality management system, Risk analysis (engineering), Control and Systems Engineering, Management system, Aircraft maintenance, Recherche opérationnelle, Lead time
Abstract

The aircraft maintenance processes play an important role in a safe operation of an aircraft. Maintenance services organizations take responsibility for the maintenance process and approve the airworthiness of an aircraft after undertaking the maintenance activities. International law determines the quality of aircraft maintenance processes by setting requirements concerning, among other, a quality management system, a safety management system and operators’ competences. As a consequence of the rising number of aircraft in operation, the volume of maintenance activities grows. However, the customers increasingly pose requirements concerning the minimization of the maintenance service lead time. In order to remain competitive, the maintenance service organizations have to reduce the lead time of their services. However, this objective in not easy to attain, since the complexity of aircraft maintenance operations require specific skills and pose a number of organisational and technical constraints to be respected during the maintenance process. In the paper, a mathematical programming model is developed in order to help decision makers in managing the operators’ skills during the operators assignment to the activities to be performed. In particular, the Hall’s marriage theorem is used to formalise complex restrictions of operators assignment to maintenance activities. The objective of the optimization problem is to minimize total makespan time. The model is applied to a case study.

Published
2017
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6. The influence of ash content on thermophysical properties of ethylene glycol based graphite/diamonds mixture nanofluids

Author

Patrice Estellé, Jacek Fal, Gaweł Żyła, Rzeszow University of Technology, Laboratoire de Génie Civil et Génie Mécanique (LGCGM), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Research was partially supported by EU COST ActionCA15119: Overcoming Barriers to Nanofluids Market Uptake., Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)

Subjects
Materials science, 020209 energy, Nanoparticle, 02 engineering and technology, Nanofluid, Nanodiamonds, [SPI.MAT]Engineering Sciences [physics]/Materials, chemistry.chemical_compound, Thermal conductivity, Rheology, Electrical resistivity and conductivity, Heat exchanger, Electrical conductivity, 0202 electrical engineering, electronic engineering, information engineering, Materials Chemistry, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], Graphite, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Electrical and Electronic Engineering, Composite material, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Mechanics of the fluids [physics.class-ph], Mechanical Engineering, Ash content, General Chemistry, 021001 nanoscience & nanotechnology, Electronic, Optical and Magnetic Materials, chemistry, 13. Climate action, [PHYS.MECA.THER]Physics [physics]/Mechanics [physics]/Thermics [physics.class-ph], 0210 nano-technology, Ethylene glycol
Abstract

Authors wish to thank Dr. Magdalena Gizowska from Department of Nanotechnology, Institute of Ceramics and Building Materials, Warsaw, Poland for measurements of density of nanopowders. The authors acknowledge also Loïc Joanny from CMEBA, Université Rennes 1 and Mathieu Pasturel from the Institut des Sciences Chimiques de Rennes, Université Rennes 1 for performing respectively SEM and XRD characterization.; International audience; Since the second half of the twentieth century, nanofluids are very promising engineering materials that can find numerous applications in the processes of heat exchange. Scientist and engineers are developing new and more advanced nanosuspensions which may differ from their physical properties, production costs and practical use. The aim of this paper is to study the differences between two nanofluids containing a mixture of graphite and nanodiamonds with various ash content. Here, ethylene glycol was used as a base fluid. Rheological properties, thermal and electrical conductivities at a constant temperature 298.15K were investigated for nanoparticle volume content ranging from 0.004 to 0.023. It was presented that ash content in nanofluids changes significantly rheological properties of nanofluids containing graphite/nanodiamonds mixture nanoparticles. While the variation in ash content does not affect thermal conductivity of nanofluids, a big impact on electrical conductivity is reported.

Published
2017
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7. Effect of high-energy mechanical milling on the medium-range ordering in glassy As-Se

Author

Zdenka Bujňáková, Pavlo Demchenko, Oleh Shpotyuk, Catherine Boussard-Plédel, Peter Baláž, Bruno Bureau, Yaroslav Shpotyuk, Ivan Franko National University of Lviv, Rzeszow University of Technology, Slovak Academy of Science [Bratislava] (SAS), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Jan Dlugosz University in Czestochowa, Vlokh Institute of Physical Optics, APVV‐18‐0357, Agentúra na Podporu Výskumu a Vývoja, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
High energy, Materials science, Mechanical milling, medium-range ordering, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, high-energy mechanical milling, arsenoselenide glasses, Medium range, X-ray powder diffraction, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, intermediate-range ordering, [CHIM]Chemical Sciences, Composite material, 010306 general physics, 0210 nano-technology
Abstract

International audience; Effect of high-energy mechanical milling on glassy AsxSe100 - x (5

Published
2020
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8. Carbon Nanomaterial-Based Nanofluids for Direct Thermal Solar Absorption

Author

Nguyen Trong Tam, Gaweł Żyła, Nguyen Viet Phuong, Masoud Afrand, Patrice Estellé, Bui Hung Thang, Pham Van Trinh, Phan Ngoc Minh, Phan Hong Khoi, Institute of Materials Sciences, Vietnam Academy of Science and Technology (VAST), Vietnam Maritime University [Hai Phon] (VMU), Duy Tan University (DTU), Rzeszow University of Technology, Laboratoire de Génie Civil et Génie Mécanique (LGCGM), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)

Subjects
Materials science, 020209 energy, General Chemical Engineering, Solar absorption, Nanotechnology, Review, 02 engineering and technology, 7. Clean energy, [SPI.MAT]Engineering Sciences [physics]/Materials, lcsh:Chemistry, Nanofluid, Thermal conductivity, Thermal, 0202 electrical engineering, electronic engineering, information engineering, Heat transfer fluid, General Materials Science, thermal conductivity, Absorption (electromagnetic radiation), Carbon nanomaterials, carbon nanomaterials, nanofluids, 021001 nanoscience & nanotechnology, lcsh:QD1-999, direct thermal solar absorption, viscosity, [SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph], 0210 nano-technology
Abstract

International audience; Recently, many scientists have been making remarkable efforts to enhance the efficiency of direct solar thermal absorption collectors that depends on working fluids. There are a number of heat transfer fluids being investigated and developed. Among these fluids, carbon nanomaterial-based nanofluids have become the candidates with the most potential by the heat absorbing and transfer properties of the carbon nanomaterials. This paper provides an overview of the current achievements in preparing and exploiting carbon nanomaterial-based nanofluids to direct thermal solar absorption. In addition, a brief discussion of challenges and recommendations for future work is presented.

Published
2020
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9. Free-volume structure of polyvinylpyrrolidone-capped glassy As 2 Se 3 nanocomposites prepared by mechanical milling

Author

Peter Baláž, Yaroslav Shpotyuk, Mariusz Woźny, Oleh Shpotyuk, Bruno Bureau, Adam Ingram, Catherine Boussard-Plédel, D. P. Slobodzyan, Zdenka Bujňáková, Jan Dlugosz University in Czestochowa, Opole University of Technology, University of Technology (Opole), Slovak Academy of Sciences (SAS), Ivan Franko National University of Lviv, Rzeszow University of Technology, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Polymers and Plastics, Plastic products, Volume elements, Mechanical milling, Electrons, 02 engineering and technology, Water solutions, 010402 general chemistry, 01 natural sciences, Selenium compounds, Nanocomposites, High-energy mechanical milling, Polyvinyl pyrrolidone, Positrons, Decomposition algorithm, Materials Chemistry, medicine, [CHIM]Chemical Sciences, ComputingMilieux_MISCELLANEOUS, Positron lifetime, Nanocomposite, Polyvinylpyrrolidone, General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Positron annihilation lifetime spectroscopy, Chemical engineering, Volume (thermodynamics), Free volume, Glass, Mechanical alloying, 0210 nano-technology, Milling (machining), medicine.drug
Abstract

International audience

Published
2019
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10. Thermophysical profile of ethylene glycol based nanofluids containing two types of carbon black nanoparticles with different specific surface areas

Author

Samah Hamze, Patrice Estellé, Jacek Fal, Jolanta Sobczak, Javier P. Vallejo, Julian Traciak, Luis Lugo, Gaweł Żyła, Rzeszow University of Technology, Universidade de Vigo, Laboratoire de Génie Civil et Génie Mécanique (LGCGM), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), UPB.FE.20.001Ministère de l'Education Nationale, de l'Enseignement Superieur et de la Recherche, MESREuropean Commission, ECMinisterio de Economía y Competitividad, MINECOEuropean Regional Development Fund, FEDERMinisterio de Economía, Industria y Competitividad, Gobierno de España, MINECOEuropean Regional Development Fund, FEDER: COST-STSM-CA15119-46214, ENE2017-86425-C2-1-R, COST-STSM-CA15119-46737, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)

Subjects
Heat capacity, Materials science, Nanoparticle, 02 engineering and technology, Nanofluid, 010402 general chemistry, 01 natural sciences, Surface tension, [SPI]Engineering Sciences [physics], chemistry.chemical_compound, Thermal conductivity, Carbon black, Electrical resistivity and conductivity, Specific surface area, Materials Chemistry, Physical and Theoretical Chemistry, Spectroscopy, Viscosity, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Chemical engineering, chemistry, 0210 nano-technology, Ethylene glycol
Abstract

International audience; The paper summarizes results of experimental studies on thermophysical and electrical properties of ethylene glycol based nanofluids containing carbon black nanoparticles. Two types of nanoparticles differing in size and specific surface area were used to develop nanofluids. During the examination thermal conductivity, isobaric heat capacity, mass density, nanofluid-air surface tension, dynamic viscosity, refractive index and electrical conductivity were measured in strict controlled temperature 298.15 K. Obtained results indicate that the specific surface area has great influence on these fundamental properties of nanofluids developed with carbon nanoparticles. Finally, the enhancement of electrical conductivity described in the paper is one of the highest reported for the nanofluids in available literature.

Published
2021
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11. PAL spectroscopy of rare-earth doped Ga–Ge–Te/Se glasses

Author

Adam Ingram, Yaroslav Shpotyuk, Oleh Shpotyuk, Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Rzeszow University of Technology, Opole University of Technology, University of Technology (Opole), Jan Dlugosz University, ShYa acknowledges support for this research funded by Marie-Curie ActionFP7-PEOPLE-2010-ITN under the GlaCERCo project., Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Jan Dlugosz University in Czestochowa

Subjects
Materials science, Chalcogenide, Analytical chemistry, positron annihilation spectroscopy, 02 engineering and technology, Trapping, 01 natural sciences, Spectral line, Positron annihilation spectroscopy, chemistry.chemical_compound, Chalcogen, Positron, 0103 physical sciences, [CHIM]Chemical Sciences, General Materials Science, Spectroscopy, Microstructure, 010302 applied physics, Condensed matter physics, Glasses, Doping, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, chemistry, chalcogenides, Defects, 0210 nano-technology
Abstract

Positron annihilation lifetime (PAL) spectroscopy was applied for the first time to study free-volume void evolution in chalcogenide glasses of Ga–Ge–Te/Se cut-section exemplified by glassy Ga 10 Ge 15 Te 75 and Ga 10 Ge 15 Te 72 Se 3 doped with 500 ppm of Tb 3+ or Pr 3+ . The collected PAL spectra reconstructed within two-state trapping model reveal decaying tendency in positron trapping efficiency in these glasses under rare-earth doping. This effect results in unchanged or slightly increased defect-related lifetimes τ 2 at the cost of more strong decrease in I 2 intensities, as well as reduced positron trapping rate in defects and fraction of trapped positrons. Observed changes are ascribed to rare-earth activated elimination of intrinsic free volumes associated mainly with negatively-charged states of chalcogen atoms especially those neighboring with Ga-based polyhedrons.

Published
2016
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12. Bulk boundary correspondence and the existence of Majorana bound states on the edges of 2D topological superconductors

Author

Vardan Kaladzhyan, Cristina Bena, Nicholas Sedlmayr, C. Dutreix, Department of Physics, Rzeszów University of Technology, Rzeszow University of Technology, Department of Physics and Astronomy [East Lansing], Michigan State University [East Lansing], Michigan State University System-Michigan State University System, Institut de Physique Théorique - UMR CNRS 3681 (IPHT), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Solides (LPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Ondes et Matière d'Aquitaine (LOMA), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure de Lyon (ENS de Lyon), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), École normale supérieure - Lyon (ENS Lyon), and Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
[PHYS]Physics [physics], Physics, Superconductivity, Chern class, Condensed Matter - Mesoscale and Nanoscale Physics, FOS: Physical sciences, 02 engineering and technology, 021001 nanoscience & nanotechnology, Topology, 01 natural sciences, MAJORANA, Quantum mechanics, Topological index, Topological insulator, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, Bound state, Topological order, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, 0210 nano-technology, Topological quantum number
Abstract

The bulk-boundary correspondence establishes a connection between the bulk topological index of an insulator or superconductor, and the number of topologically protected edge bands or states. For topological superconductors in two dimensions the first Chern number is related to the number of protected bands within the bulk energy gap, and is therefore assumed to give the number of Majorana band states in the system. Here we show that this is not necessarily the case. As an example we consider a hexagonal-lattice topological superconductor based on a model of graphene with Rashba spin orbit coupling, proximity induced s-wave superconductivity, and a Zeeman magnetic field. We explore the full Chern number phase diagram of this model, extending what is already known about its parity. We then demonstrate that despite the high Chern numbers that can be seen in some phases these do not strictly always contain Majorana bound states., Comment: 8 pages, 7 figures

Published
2017
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13. On the glass transition temperature T against molar volume V plotting in arsenoselenide glasses

Author

V. Balitska, Catherine Boussard-Plédel, Bruno Bureau, J. Szlęzak, V. Boyko, Oleh Shpotyuk, Ya. Shpotyuk, M. Shpotyuk, National Polytechnic University of Lviv (LPNU), Rzeszow University of Technology, Ivan Franko National University of Lviv, Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Jan Dlugosz University in Czestochowa, Ministry of Education and Science of Ukraine, MESU, Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)

Subjects
Materials science, Molar volume, Thermodynamics, Chalcogenide glass, 02 engineering and technology, 01 natural sciences, symbols.namesake, 0103 physical sciences, Master equation, Materials Chemistry, Glass transition temperature, Bond energy, 010302 applied physics, Van der Waals interaction, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Glass-forming network, Ceramics and Composites, symbols, Arsenoselenides, van der Waals force, 0210 nano-technology, Glass transition
Abstract

International audience; Dependence of glass transition temperature Tg (K) on overall mean bonding energy E (kJ/mol) in arsenoselenide glass reexamined under per-atom calculations is shown to obey linearized master equation Tg ≅ 418⋅(E–1.13). Compositional variations in Tg against molar volume Vm are plotted for g-AsxSe100- x taken within (0 ≤ x ≤ 65) domain assuming preferential cohesive Van der Waals (VDW) bonding between network-constituting entities. The Tg values are found to vary as inverse-αth power of Vm, attaining distinct values for different networks, in part, 0D-molecular (α=6/3= 2), 1D-chained (α=5/3), 2D-layered (α=4/3), and 3D-spatial (α=3/3=1). These variations originated from macroscopic geometry of VDW interaction are linearized in log-log presentation for networks dominated with chain-like 1D-entities (0 ≤ x

Published
2020
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14. Shot Noise in Epitaxial Double-Barrier Magnetic Tunnel Junctions

Author

Jozef Barnas, Amandine Dulluard, Vitalii K. Dugaev, Coriolan Tiusan, T. Szczepański, Laura Martin, Michel Hehn, Farkhad G. Aliev, Juan Pedro Cascales, Agro-Systèmes Territoires Ressources Mirecourt (ASTER Mirecourt), Institut National de la Recherche Agronomique (INRA), Institut Jean Lamour (IJL), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Technical University of Cluj-Napoca, Department of Physics, Rzeszów University of Technology, Rzeszow University of Technology, and Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Condensed matter physics, Magnetic moment, media_common.quotation_subject, Shot noise, Conductance, 02 engineering and technology, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, 01 natural sciences, Asymmetry, Electronic, Optical and Magnetic Materials, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Ferromagnetism, Condensed Matter::Superconductivity, 0103 physical sciences, Electrode, Electrical and Electronic Engineering, 010306 general physics, 0210 nano-technology, Quantum well, Quantum tunnelling, media_common
Abstract

International audience; We demonstrate that shot noise in Fe/MgO/Fe/MgO/Fe double-barrier magnetic tunnel junctions is determined by the magnetic configuration of the junction-the P-state with the magnetic moments of all three ferromagnetic layers aligned parallel, the AP1 state with the central electrode magnetized opposite to its neighbors, and two different AP2 states with the magnetic moment of the upper or bottom electrode aligned opposite to the other two. We also show that the asymmetry between both MgO barriers is another important factor which affects the shot noise. Some voltages present an enhancement in both conductance and shot noise, which indicates that resonant tunneling through quantum well states formed in the middle magnetic layer is taking place. When the junctions are heated to 60 K, the resonance tunneling anomalies in the shot noise smear out, but they survive in the differential conductance. On the other hand, at low voltages (below 200 mV) and low temperatures (below 4 K) the shot noise tends to decrease, probably due to multi-step tunneling via localized defect states in the tunnel MgO barrier. The theoretical model of sequential tunneling proposed for this system, which takes into account spin relaxation, successfully describes the experimental observations in the bias range between 200 mV and 500 mV, where the influence of tunneling through barrier defects and resonant states inside the central electrode is negligible.

Published
2013
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15. Effect of rare-earth doping on the free-volume structure of Ga-modified Te20As30Se50 glass

Author

Virginie Nazabal, Adam Ingram, Oleh Shpotyuk, Catherine Boussard-Plédel, Bruno Bureau, Ya. Shpotyuk, Ivan Franko National University of Lviv, Rzeszow University of Technology, Opole University of Technology, University of Technology (Opole), Institute of Physics, JAN DLUGOSZ UNIV, Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), This research is supported by POLONIUM common actions program for years 2015-2016 realized in respect to bilateral Agreement on scientific-technical cooperation between Polish and French governments from 1966., Institute of Physics [Jan Dlugosz University in Częstochowa], Jan Dlugosz University in Czestochowa, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Chalcogenide glasses, General Chemical Engineering, Alloy, photonics, 02 engineering and technology, semiconductors, engineering.material, 01 natural sciences, Spectral line, Ion, Positron, active applications, 0103 physical sciences, 010302 applied physics, lifetime, Annihilation, Doping, bond approach, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, positron-annihilation, progress, Covalent bond, engineering, IR, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Physics::Accelerator Physics, Defects, Atomic physics, 0210 nano-technology, Intensity (heat transfer)
Abstract

International audience; By exploring the positron-electron annihilation technique in positron lifetime measuring mode, it is shown that principal rare-earth (RE) induced structural reconfiguration in Ga-codoped TAS-235 glass (that is a glassy Te20As29Ga1Se50 alloy) is related to occupation of intrinsic free-volume voids by embedded RE ions tightly connected with Ga-based tetrahedrons via strong covalent RE-Se/Te-Ga links. A gradual decrease in the intensity of the second component of two-term decomposed lifetime spectra of annihilating positrons accompanied with a detectable increase in the defect-related positron lifetime (thus inducing essentially a depressed rate in positron trapping) is evidenced by the example of Pr3+ ions added homogeneously to Te20As29Ga1Se50 glass in the amount of 500 ppmw. Observed changes in positron lifetime spectra are explained in terms of the competitive contribution of different occupancy positions in Ga-codoped glass available for RE ions and trapped positrons.

Published
2016
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16. Free-Volume Nanostructurization in Ga-Modified As2Se3 Glass

Author

A. Dziedzic, Adam Ingram, Bruno Bureau, Oleh Shpotyuk, Ya. Shpotyuk, Catherine Boussard-Plédel, Ivan Franko National University of Lviv, Rzeszow University of Technology, Opole University of Technology, University of Technology (Opole), Institute of Physics, JAN DLUGOSZ UNIV, Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institute of Physics [Jan Dlugosz University in Częstochowa], Jan Dlugosz University in Czestochowa, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Void (astronomy), Materials science, Scanning electron microscope, Analytical chemistry, Nanochemistry, Nanotechnology, 02 engineering and technology, 01 natural sciences, law.invention, Condensed Matter::Materials Science, Positron, Materials Science(all), law, 0103 physical sciences, Nanotechnology and Microengineering, [CHIM]Chemical Sciences, General Materials Science, Crystallization, Spectroscopy, 010302 applied physics, Nano Express, Nanostructurization, Nanoscale Science and Technology, Doping, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Positron annihilation lifetime spectroscopy, chalcogenides, Molecular Medicine, phase separation, 0210 nano-technology, Powder diffraction
Abstract

International audience; Different stages of intrinsic nanostructurization related to evolution of free-volume voids, including phase separation, crystalline nuclei precipitation, and growth, were studied in glassy As2Se3 doped with Ga up to 5 at. %, using complementary techniques of positron annihilation lifetime spectroscopy, X-ray powder diffraction, and scanning electron microscopy with energy-dispersive X-ray analysis. Positron lifetime spectra reconstructed in terms of a two-state trapping model testified in favor of a native void structure of g-As2Se3 modified by Ga additions. Under small Ga content (below 3 at. %), the positron trapping in glassy alloys was dominated by voids associated with bond-free solid angles of bridging As2Se4/2 units. This void agglomeration trend was changed on fragmentation with further Ga doping due to crystalline Ga2Se3 nuclei precipitation and growth, these changes being activated by employing free volume from just attached As-rich glassy matrix with higher content of As2Se4/2 clusters. Respectively, the positron trapping on free-volume voids related to pyramidal AsSe3/2 units (like in parent As2Se3 glass) was in obvious preference in such glassy crystalline alloys

Published
2016
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17. Highly Luminous Sky-Blue Organic Light-Emitting Diodes Based on the Bis[(1,2)(5,6)]indoloanthracene Emissive Layer

Author

Bernhard Witulski, Boris F. Minaev, Vladyslav Cherpak, Gleb V. Baryshnikov, Pawel Gawrys, Beata Luszczynska, Richard J. Whitby, Gabriela Wiosna-Salyga, Sigitas Tamulevičius, Juozas V. Grazulevicius, Dmytro Volyniuk, Algirdas Lazauskas, Evgeniy Stromylo, Pavlo Stakhira, Zenon Hotra, Khrystyna Ivaniuk, Mark E. Light, Rzeszow University of Technology, Royal Institute of Technology [Stockholm] (KTH ), Kaunas University of Technology (KTU), Laboratoire de chimie moléculaire et thioorganique (LCMT), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Normandie Université (NU)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Le Havre Normandie (ULH), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), University of Southampton, Łódź University of Technology, European Project: ERDF, Centre National de la Recherche Scientifique (CNRS)-Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), and Normandie Université (NU)

Subjects
Materials science, business.industry, Quantum yield, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Photochemistry, 01 natural sciences, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Active layer, General Energy, Semiconductor, Optics, OLED, Molecule, [CHIM]Chemical Sciences, Physical and Theoretical Chemistry, 0210 nano-technology, business, Luminescence, Isomerization, ComputingMilieux_MISCELLANEOUS, Diode
Abstract

An in-depth analysis of the electro-optical and light emissive properties was carried out with a new fused heteroacene, the bis [(1,2)(5,6)] indoloanthracene. The compound was synthesized in a straightforward bidirectional manner from 1,4-dibromo-2,5-diodobenzene utilizing a reaction cascade of isomerisation and cyclisation sequences. Bis-[(1,2)(5,6)] indoloanthracene exhibits bright luminescence with high quantum yield in solution as well as in the solid state. By using this novel semiconductor as active layer, an efficient OLED has been fabricated for which its emission pattern resembles at least two emitters in a single emissive region originated from the same molecule. One has its origin from the single molecule and is similar to the luminescence spectra in solution, whereas the other functions through the formation of aggregates being similar with the emission pattern found with crystals of bis-[(1,2)(5,6)]indoloanthracene. As a result bright sky-blue OLEDs with very high luminance exceeding 10000 cd/m2 were obtained. Such color pattern and performance has not previously been observed with low molecular weight, electron-rich fused polycyclic aromatic compounds and indicate a promising new class of materials for development.

Published
2016
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18. Multiphase Biomineralization: Enigmatic Invasive Siliceous Diatoms Produce Crystalline Calcite

Author

Iaroslav Petrenko, Krzysztof J. Kurzydłowski, Hartmut Stöcker, Enrico Langer, S. Suski, Andreas Richter, Izabela Zgłobicka, Vasilii V. Bazhenov, Tomasz Płociński, Marcin Pisarek, Teresa Noga, Armin Springer, Mykhailo Motylenko, Anna A. Makarova, Teofil Jesionowski, Juliane Walter, David Rafaja, Andrzej Witkowski, Alexander V. Ereskovsky, Dirk C. Meyer, Elke Niederschlag, Michael Gelinsky, Pallaoor V. Sundareshwar, Denis V. Vyalikh, Serguei L. Molodtsov, Henryk Bilski, Mikhail V. Tsurkan, Elzbieta Wyroba, Marcin Wysokowski, Hermann Ehrlich, Technishe Universität Bergakademie Freiberg, CNR Institute of Atmospheric Sciences and Climate (ISAC), Consiglio Nazionale delle Ricerche (CNR), Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement [IRD] : UMR237-Centre National de la Recherche Scientifique (CNRS), Faculty of Materials Science and Engineering, Warsaw University of Technology [Warsaw], Rzeszow University of Technology, Max Bergmann Centre of Biomaterial Dresden, Leibniz-Institut für Polymerforschung Dresden e.V. (IPF), Leibniz Association-Leibniz Association-Technische Universität Dresden (TUD), Nencki Institute of Experimental Biology, Polska Akademia Nauk (PAN), Technische Universität Dresden (TUD), Institute of Environmental Physics [Bremen] (IUP), University of Bremen, Institute of Physical Chemistry, Physical Chemistry of Materials Center, lnstitute of Marine Sciences and Coastal Research, University of Szczecin, BIOlogie et GEstion des Risques en agriculture (BIOGER), AgroParisTech-Institut National de la Recherche Agronomique (INRA), Poznan University of Technology, Technishe Universität Bergakademie Freiberg (TU Bergakademie Freiberg), Leibniz Association-Leibniz Association-Technische Universität Dresden = Dresden University of Technology (TU Dresden), Polska Akademia Nauk = Polish Academy of Sciences (PAN), Technische Universität Dresden = Dresden University of Technology (TU Dresden), Institute of Experimental Physics [Freiberg], Poznan University of Technology (PUT), and National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR)

Subjects
0301 basic medicine, Materials science, 02 engineering and technology, Biogenic silica, Biomaterials, 03 medical and health sciences, chemistry.chemical_compound, Algae, Electrochemistry, [SDV.BBM.BC]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biochemistry [q-bio.BM], Calcite, biology, Carbon fixation, 021001 nanoscience & nanotechnology, Condensed Matter Physics, biology.organism_classification, Didymosphenia geminata, Electronic, Optical and Magnetic Materials, [SDV.BBM.BC]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biomolecules [q-bio.BM], 030104 developmental biology, Calcium carbonate, Diatom, chemistry, Chemical engineering, 0210 nano-technology, Biomineralization
Abstract

International audience; Diatoms are considered unicellular eukaryotic organisms exclusively depositing biogenic silica. Heretofore there has been no report of calcification by these algae. Here it is shown that calcium carbonate within the stalks of Didymosphenia geminata, a nuisance species that has prolifically colonized streams and rivers globally, is biogenic in origin and occurs as a network of calcite nanofibers. The nanofibrous framework in the mineralized polysaccharide matrix imparts mechanical support to the stalks, providing stability in variable flow conditions. The results demonstrate that D. geminata possesses cellular and periplasmic carbonic‐anhydrases that contribute to carbon fixation and biomineralization, respectively. The activity of external carbonic‐anhydrase was more than 50% of the total activity, which points to its role in anchoring this bioeroding diatom on hard surfaces. The first evidence of multiphase biomineralization by diatoms that deposit both biogenic silica and crystalline biogenic calcite which are imparting distinct functional advantage to the organism is provided.

Published
2016
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19. Site-binding model as a basis for numerical evaluation of analytical parameters of capacitance-biosensors for formaldehyde and methylamine detection

Author

Yaroslav I. Korpan, Cherif Dridi, J. Chermiti, Mykhailo Gonchar, M. Ben Ali, Nicole Jaffrezic-Renault, Institut Supérieur des Sciences Appliquées et de Technologie de Sousse (ISSATS), Université de Sousse, Unité de Recherche de Physique des Semi-conducteurs et Capteurs, Université de Carthage - University of Carthage-IPEST, Laboratoire des Interfaces et Matériaux Avancés [Monastir] (LIMA), Faculté des Sciences de Monastir (FSM), Université de Monastir - University of Monastir (UM)-Université de Monastir - University of Monastir (UM), Institute of Cell Biology, National Academy of Science of Ukraine, Institute of Applied Biotechnology and Basic Sciences, Rzeszow University, SIMS - Surfaces-(bio)Interfaces - Micro & Nano Systèmes (2011-2014), Institut des Sciences Analytiques (ISA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine (NASU), NATO Science for Peace (SFP) Project CBP.NUKR.SFP 984173, and FP7-PEOPLE-2012-IRSES No. 318053: SMARTCANCERSENS project.

Subjects
Analyte, Nanotechnology, 02 engineering and technology, Numerical simulation, 01 natural sciences, Capacitance, Buffer (optical fiber), chemistry.chemical_compound, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, Microsystem, Materials Chemistry, Mott-Schottky equation, Electrical and Electronic Engineering, Capacitance structures, Instrumentation, Computer simulation, Methylamine, business.industry, 010401 analytical chemistry, Site-binding model, technology, industry, and agriculture, Metals and Alloys, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Semiconductor, Biosensors, chemistry, 0210 nano-technology, business, Biological system, Biosensor
Abstract

International audience; The development of sensor microsystems, based on the biological recognition of analytes by sensitive molecules, requires numerical tools for the evaluation of sensor analytical characteristics. A digital platform, based on the site-binding model and Mott-Schottky equation, has been developed and used to estimate the responses of semiconductor-based capacitance biosensors for formaldehyde and methylamine determination. It has been demonstrated that the classical site-binding model cannot be applied for the analysis of the sensor behaviour and should be adjusted taking into account the effect of buffer type and its concentration and type as well as membrane composition on the capacitance biosensor response.

Published
2013
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