D. Roux

Académie de Paris

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A. M. Bellocq

Centre National de la Recherche Scientifique

Frédéric Nallet

Université de Bordeaux

M. E. Cates

University of Cambridge

Scott T. Milner

Pennsylvania State University

Cyrus R. Safinya

University of California, Santa Barbara

David Andelman

Tel Aviv University

S. A. Safran

Weizmann Institute of Science

C. Coulon

Center for Research in Psychopathology and Clinical Psychology

Olivier Diat

CEA Marcoule

Annie Colin

ESPCI Paris

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Centre National de la Recherche Scientifique

119

Paul Pascal Research Center

Université de Bordeaux

Center for Research in Psychopathology and Clinical Psychology

Inserm

Sorbonne Université

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Institut thématique Santé Publique

Santé Publique France

Centre Hospitalier Universitaire Pointe-à-Pitre

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Rheophysics of Lamellar Phases

Revue de l Institut Français du Pétrole (1997)

D. Roux

We have developed several techniques to study the effect of shear on complex fluids. These techniques are based on shear cells specially adapted to scattering techniques or transport properties. A brief description of the cells will be given together with the results that can be obtained using these techniques. Exemples on lyotropic systems will be detailed. The effect of shear on lyotropic lamellar phases is studied by light scattering, neutron scattering and microscopic observations. We found three different states of orientation separated with out-of-equilibrium transitions. In the state at very low shear rate, the lamellar phase is, in average, oriented with the layers in the shear plane and a few dislocations remains in the direction of the flow. In the intermediate state, the layers organize themselves into monodisperse multilayer vesicles (MLV) whose size is controlled by the shear rate. The last state corresponds to the same orientation than the first one but with no dislocations in the flow direction. The second state of orientation : leading to the MLV structure, is more precisely studied. It is shown that the size of the MLV is fixed by a balance between the viscous and elastic stresses and varies as the inverse square root of the shear rate. A possible mechanism for the formation of this structure is proposed. We show that this structure can be swollen in a solvent leading to a monodisperse emulsion of a lamellar structure in an isotropic liquid. Linear and nonlinear rheological properties are measured and discussed. It is shown that the viscosity is sensitive to the structure and varies of several order of magnitude depending in which phase of orientation the system is. Both shear thickening and shear thinning are described and explanations in terms or orientation transitions are given. The discovery of the oriented to MLV instability is the basis a very efficient process leading to well controlled microcapsules made of surfactant. Many applications of MLV produced by this technique are described including biological ones. In particular we will present results on enzymes and DNA encapsulation.

Lyotropic

10.2516/ogst:1997013

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Citations (2)

Flow Behavior and Shear Induced Transition near an Isotropic/Nematic Transition in Equilibrium Polymers

Langmuir (1994)

Véronique Schmitt François Lequeux A. Pousse D. Roux

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlow Behavior and Shear Induced Transition near an Isotropic/Nematic Transition in Equilibrium PolymersV. Schmitt, F. Lequeux, A. Pousse, and D. RouxCite this: Langmuir 1994, 10, 3, 955–961Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994https://pubs.acs.org/doi/10.1021/la00015a057https://doi.org/10.1021/la00015a057research-articleACS PublicationsRequest reuse permissionsArticle Views377Altmetric-Citations142LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

10.1021/la00015a057

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Citations (148)

Amplification of Antibody Responses to Antigen Using Small Multilamellar Vesicles for Delivery System

Drug Delivery (2005)

Sophie Gaubert Emmanuelle Bayer Brigitte Delord D. Roux Joëlle Amédée

New vaccines based on subunits, synthetic peptides, or DNA need innovative adjuvants or antigen delivery systems: Spherulites® are multilamellar vesicles made of biocompatible lipid bilayers without any aqueous core. In this study, we evaluated their ability to induce immune responses against human serum albumin (HSA). Mice were immunized by the intraperitoneal/intravenous route or subcutaneously with HSA without any adjuvant or in its encapsulated form. We showed that Spherulites® strongly enhanced the seric antibody responses and lead to a mixed isotypic distribution characterized by an IgG2a potentiation. This demonstrated that Spherulites® can improve the presentation of weak antigens to the immune system.

Human serum albumin

Bovine serum albumin

Delivery system

10.1080/10717540490446026

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Citations (9)

Introduction and General Theory of Lyotropic Liquid Crystals

NATO ASI series. Series B : Physics (1992)

D. Roux

Lyotropic

Lamellar phase

Lyotropic liquid crystal

Columnar phase

10.1007/978-1-4684-9151-7_26

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Citations (2)

Microemulsions

Advances in Colloid and Interface Science (1984)

A. M. Bellocq J. Biais P. Bothorel B. Clin Georges Fourche

Microemulsion

Critical point (mathematics)

Brine

10.1016/0001-8686(84)80005-6

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Citations (130)

Time- and Angle-triggered Real-time Kernel

Design, Automation & Test in Europe Conference & Exhibition (DATE), 2015 (2013)

Damien Chabrol D. Roux David Vernon Mathieu Jan Moha Ait Hmid

Powertrain controllers are automotive applications that bring real-time constraints on software treatments based on the angular position of tooth in the motor. Theses constraints depend on the engine speed and can be as short as 100µsec. A time-triggered approach provides a predictable and reproducible execution of real-time systems but cannot cope with so tight constraints and does not allow to directly specifying the temporal behavior of the system based on angles. The contribution of this work is to present how the ability of the PharOS technology to combine several time domains (time and angle triggered) allows designing and executing powertrain controllers in a deterministic way on multi-core architectures. To this end, we present a prototype of a subset of a powertrain controller from Delphi based on PharOS.

Powertrain

Kernel (algebra)

Position (finance)

10.7873/date.2013.223

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Citations (3)

Lamellar phase under shear : SANS measurements

Journal de Physique IV (Proceedings) (1993)

Olivier Diat D. Roux Frédéric Nallet

Lamellar phase

10.1051/jp4:1993839

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Citations (16)

Le verre : un matériau éternel

Reflets de la physique (2022)

D. Roux

L’ambition de cet article est d’illustrer, à travers quelques faits historiques et propriétés du verre, les liens entre science, technologie et innovation. En décrivant ce matériau aux propriétés extraordinaires, on en profitera pour présenter de façon très simple les principes physiques permettant de comprendre sa nature et ses propriétés. À chaque fois, on donnera une illustration prise dans la vie courante ou liée à une histoire des propriétés du verre. Les riches documentations des archives des sociétés Saint-Gobain et Corning apportent un complément illustratif : www.saint-gobain350ans.com/#!/fr , www.cmog.org/francais .

10.1051/refdp/202274010

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Observation of a Topological Relaxation Mode in Microemulsions

Physical Review Letters (2001)

U. Peter D. Roux Anil K. Sood

We report the observation of two diffusive relaxation modes in a very swollen microemulsion, measured by quasielastic light scattering experiments. In addition to a short-time diffusion process, we observe a long-time diffusive relaxation mode with unusual scaling behavior: the diffusion constant D is an exponential function of the characteristic length scale xi, D~exp(-xi). This observation provides experimental evidence for thermally activated topological relaxation of random fluid phases, as predicted by Milner et al. [J. Phys. (Paris) 51, 2629 (1990)]. We describe the activation energy of such a process by some simple microscopic model for the surfactant layer and give an estimation of the membrane elastic and Gaussian moduli kappa and kappa;, and its spontaneous curvature.

10.1103/physrevlett.86.3340

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Citations (29)

Transfection of DNA Using Small Multilamellar Vesicles Prepared Under Shear

APS March Meeting Abstracts (1997)

D. Roux

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