Search

Your search keyword '"Laboratoire de Physique de la Matière Condensée ( LPMC )"' showing total 6 results
Start Over Author "Laboratoire de Physique de la Matière Condensée ( LPMC )" Journal europhysics letters (epl)
6 results on '"Laboratoire de Physique de la Matière Condensée ( LPMC )"'

1. Inhomogeneous losses and complexness of wave functions in chaotic cavities

Author

Dmitry V. Savin, Fabrice Mortessagne, Olivier Legrand, Fachbereich Physik [Duisburg], Universität Duisburg-Essen [Essen], Department of Mathematical Sciences (DEPARTMENT OF MATHEMATICAL SCIENCES), Brunel University London [Uxbridge], Laboratoire de physique de la matière condensée (LPMC), Université Nice Sophia Antipolis (... - 2019) (UNS), and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
05.45.Mt, 05.60.Gg, 03.65.Nk, Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Scattering theory, Chaotic, FOS: Physical sciences, General Physics and Astronomy, Link (geometry), 01 natural sciences, 010305 fluids & plasmas, Quantum transport, Character (mathematics), Semiclassical chaos, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Biorthogonal system, Quantum mechanics, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, 010306 general physics, Wave function, Ohmic contact, Quantum chaos, Microwave
Abstract

In a two-dimensional microwave chaotic cavity ohmic losses located at the contour of the cavity result in different broadenings of different modes. We provide an analytic description and establish the link between such an inhomogeneous damping and the complex (non-real) character of biorthogonal wave functions. This substantiates the corresponding recent experimental findings of Barthelemy et al. [Europhys. Lett. 70, 162 (2005)]., 6 pages; published version (minor changes)

Published
2006
Full Text
View/download PDF

2. Bouncing transitions on microtextured materials

Author

A. Pépin, Frederic Marty, David Quéré, M. Reyssat, Yong Chen, Laboratoire de Physique de la Matière Condensée (LPMC), Collège de France (CdF (institution))-Centre National de la Recherche Scientifique (CNRS), Laboratoire de photonique et de nanostructures (LPN), Centre National de la Recherche Scientifique (CNRS), and ESIEE Paris

Subjects
[PHYS]Physics [physics], Surface (mathematics), Materials science, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Mechanics of the fluids [physics.class-ph], business.industry, General Physics and Astronomy, [PHYS.MECA]Physics [physics]/Mechanics [physics], 02 engineering and technology, Mechanics, 010402 general chemistry, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, 0104 chemical sciences, Optics, Wetting, 0210 nano-technology, business, ComputingMilieux_MISCELLANEOUS
Abstract

A drop of water thrown on a super-hydrophobic solid will often bounce off. Here we discuss the conditions to be fulfilled on the surface design (which provides super-hydrophobicity) to observe such a behavior. This allows us to precise how a material can be made water-repellent. We show in particular how the reduction of the scale of the microstructure provides a robust water repellency, and describe some peculiarities of violent shocks on such surfaces.

Published
2006
Full Text
View/download PDF

3. Dewetting of thin viscoelastic polymer films on slippery substrates

Author

Elie Raphaël, Thomas Vilmin, Laboratoire de Physique de la Matière Condensée (LPMC), and Collège de France (CdF (institution))-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, polymer, FOS: Physical sciences, General Physics and Astronomy, Nanotechnology, 02 engineering and technology, Substrate (electronics), Condensed Matter - Soft Condensed Matter, film, 68.60.-p, 68.15.+e, 68.55.-a, 83.10.-y, 01 natural sciences, Viscoelasticity, chemistry.chemical_compound, Residual stress, 0103 physical sciences, Dewetting, Composite material, 010306 general physics, chemistry.chemical_classification, Polymer, 021001 nanoscience & nanotechnology, Reptation, chemistry, dewetting, Soft Condensed Matter (cond-mat.soft), Slippage, Polystyrene, 0210 nano-technology, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract

Dewetting of thin polystyrene films deposited onto silicone wafers at temperatures close to the glass transition exhibits unusual dynamics and front morphologies. Here, we present a new theoretical approach of these phenomena taking into account both the viscoelastic properties of the film and the non-zero velocity of the film at the interface with the substrate (due to slippage). We then show how these two ingredients lead to : (a) A very asymmetric shape of the rim as the film dewetts, (b) A decrease of the dewetting velocity with time like $t^{-{1/2}}$ for times shorter than the reptation time (for larger times, the dewetting velocity reaches a constant value). Very recent experiments by Damman, Baudelet and Reiter [Phys. Rev. Lett. {\bf 91}, 216101 (2003)] present, however, a much faster decrease of the dewetting velocity. We then show how this striking result can be explained by the presence of residual stresses in the film., Comment: Submitted to PRL

Published
2005
Full Text
View/download PDF

4. Sliding friction between an elastomer network and a grafted polymer layer: The role of cooperative effects

Author

Elie Raphaël, Thomas Vilmin, 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, Quantitative Biology::Biomolecules, Materials science, Friction force, Solid surface, friction, FOS: Physical sciences, General Physics and Astronomy, Penetration (firestop), Polymer, Condensed Matter - Soft Condensed Matter, Elastomer, Condensed Matter::Soft Condensed Matter, surgical procedures, operative, chemistry, Soft Condensed Matter (cond-mat.soft), Composite material, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], elastomer
Abstract

We study the friction between a flat solid surface where polymer chains have been end-grafted and a cross-linked elastomer at low sliding velocity. The contribution of isolated grafted chains' penetration in the sliding elastomer has been early identified as a weakly velocity dependent pull-out force. Recent experiments have shown that the interactions between the grafted chains at high grafting density modify the friction force by grafted chain. We develop here a simple model that takes into account those interactions and gives a limit grafting density beyond which the friction no longer increases with the grafting density, in good agreement with the experimental data, Submitted to Europhys. Letters

Published
2005
Full Text
View/download PDF

5. Self-trapping of a single bacterium in its own chemoattractant

Author

Yoav Tsori, Pierre-Gilles de Gennes, Arxiv, Import, Laboratoire de Physique de la Matière Condensée (LPMC), and Collège de France (CdF (institution))-Centre National de la Recherche Scientifique (CNRS)

Subjects
Coupling constant, Physics, education.field_of_study, biology, Capillary action, Population, Populations and Evolution (q-bio.PE), General Physics and Astronomy, Chemotaxis, Trapping, biology.organism_classification, 01 natural sciences, [PHYS.COND.CM-SCM] Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], 010305 fluids & plasmas, Chemical physics, FOS: Biological sciences, 0103 physical sciences, Strong coupling, Diffusion (business), Quantitative Biology - Populations and Evolution, 010306 general physics, education, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], Bacteria
Abstract

Bacteria (e.g. E. Coli) are very sensitive to certain chemoattractants (e.g. asparate) which they themselves produce. This leads to chemical instabilities in a uniform population. We discuss here the different case of a single bacterium, following the general scheme of Brenner, Levitov and Budrene. We show that in one and two dimensions (in a capillary or in a thin film) the bacterium can become self-trapped in its cloud of attractant. This should occur if a certain coupling constant $g$ is larger than unity. We then estimate the reduced diffusion D_eff of the bacterium in the strong coupling limit, and find D_eff ~ 1/g., Comment: 4 pages, absolutely no figures

Published
2004
Full Text
View/download PDF

6. Water spring: A model for bouncing drops

Author

Denis Richard, Ko Okumura, Frédéric Chevy, Christophe Clanet, David Quéré, Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Laboratoire Kastler Brossel (LKB (Lhomond)), Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), CHU Clermont-Ferrand, Laboratoire d'hydrodynamique (LadHyX), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Physique et mécanique des milieux hétérogenes (UMR 7636) (PMMH), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Laboratoire de Physique de la Matière Condensée (LPMC), Collège de France (CdF (institution))-Centre National de la Recherche Scientifique (CNRS), Department of Physics, Ochanomizu University-Graduate School of Humanities and Sciences, Institut de Recherche sur les Phénomènes Hors Equilibre (IRPHE), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X), Physique et mécanique des milieux hétérogenes (PMMH), and Centre National de la Recherche Scientifique (CNRS)-ESPCI ParisTech-Université Paris Diderot - Paris 7 (UPD7)-Université Pierre et Marie Curie - Paris 6 (UPMC)

Subjects
Contact time, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Drop (liquid), Fluid Dynamics (physics.flu-dyn), PACS 68.03.Cd - Surface tension and related phenomena, 68.08.Bc - Wetting, 47.85.Dh - Hydrodynamics, hydraulics, hydrostatics, FOS: Physical sciences, General Physics and Astronomy, Physics - Fluid Dynamics, 02 engineering and technology, Mechanics, Condensed Matter - Soft Condensed Matter, 021001 nanoscience & nanotechnology, 01 natural sciences, 010305 fluids & plasmas, Physics::Fluid Dynamics, [SPI]Engineering Sciences [physics], 0103 physical sciences, Soft Condensed Matter (cond-mat.soft), 0210 nano-technology, Scaling, ComputingMilieux_MISCELLANEOUS, Geology
Abstract

It has been shown that a water drop can bounce persistently, when thrown on a super-hydrophobic substrate. We present here scaling arguments which allow us to predict the maximal deformation and the contact time of the drop. This approach is completed by a model describing the flow inside the drop, and by original experimental data.

Published
2003
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results