Dean, David S.
Overview
Works:  38 works in 61 publications in 2 languages and 185 library holdings 

Genres:  Academic theses Instructional films Nonfiction films Conference papers and proceedings 
Roles:  Editor, Author, Thesis advisor, Other, Opponent 
Publication Timeline
.
Most widely held works by
David S Dean
Electrostatics of soft and disordered matter by
David S Dean(
)
12 editions published between 2013 and 2014 in English and held by 130 WorldCat member libraries worldwide
Annotation
12 editions published between 2013 and 2014 in English and held by 130 WorldCat member libraries worldwide
Annotation
A ballistic technique for accurate measurement of total impulse and thrust of rocket motors with short burning times by
David Stanley Dean(
Book
)
3 editions published in 1976 in English and held by 5 WorldCat member libraries worldwide
A method is described whereby a rocket motor impulse lasting a few milliseconds may be spread over a longer period to allow it to be recorded by conventional methods with an accuracy of plus/minus 0.2%. Instantaneous thrust is also recorded with an accuracy of plus/minus 2%. Most of the problems encountered with a ballistic pendulum are avoided and only the static calibration of a load cell is required before use. (Author)
3 editions published in 1976 in English and held by 5 WorldCat member libraries worldwide
A method is described whereby a rocket motor impulse lasting a few milliseconds may be spread over a longer period to allow it to be recorded by conventional methods with an accuracy of plus/minus 0.2%. Instantaneous thrust is also recorded with an accuracy of plus/minus 2%. Most of the problems encountered with a ballistic pendulum are avoided and only the static calibration of a load cell is required before use. (Author)
The design of a stand to measure thrust alignment in solid propellent rocket motors by
D. S Dean(
Book
)
4 editions published in 1971 in English and held by 4 WorldCat member libraries worldwide
A thrust stand and calibration system is described by which the direction of the thrust vector of a rocket motor can be resolved over consecutive 50 msec intervals to within 0.7 milliradian. The angle of the overall impulse vector can be measured to better than 0.5 milliradian. Methods of improving the accuracy of the system are discussed
4 editions published in 1971 in English and held by 4 WorldCat member libraries worldwide
A thrust stand and calibration system is described by which the direction of the thrust vector of a rocket motor can be resolved over consecutive 50 msec intervals to within 0.7 milliradian. The angle of the overall impulse vector can be measured to better than 0.5 milliradian. Methods of improving the accuracy of the system are discussed
Stochastic dynamics by
David Stanley Dean(
)
3 editions published in 1993 in English and held by 3 WorldCat member libraries worldwide
3 editions published in 1993 in English and held by 3 WorldCat member libraries worldwide
Etats métastables dans les systèmes vitreux : des verres de spins aux milieux granulaires by
Alexandre Lefevre(
Book
)
2 editions published in 2003 in French and held by 2 WorldCat member libraries worldwide
2 editions published in 2003 in French and held by 2 WorldCat member libraries worldwide
Aspects of onedimensional Coulomb gases(
)
1 edition published in 2014 in English and held by 2 WorldCat member libraries worldwide
1 edition published in 2014 in English and held by 2 WorldCat member libraries worldwide
Optimal leastsquares estimators of the diffusion constant from a single Brownian trajectory by
Denis Boyer(
)
1 edition published in 2013 in English and held by 2 WorldCat member libraries worldwide
1 edition published in 2013 in English and held by 2 WorldCat member libraries worldwide
Transport and dispersion across wiggling nanopores by
Sophie Marbach(
)
1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide
1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide
Dynamique de marcheurs aléatoires en interaction : applications aux particules browniennes autogravitantes, à la condensation
de BoseEinstein, à la turbulence en déclin et aux marcheurs aléatoires en présence de pièges by
Julien Sopik(
Book
)
2 editions published in 2007 in French and held by 2 WorldCat member libraries worldwide
This thesis is dedicated to the study of the dynamical properties of various systems of interacting random walkers. In the first part of this manuscript, we study a model of selfgravitating Brownian particles. In this model, the particles evolve at fixed temperature. This corresponds to a canonical description of selfgravitating systems. When the temperature is above a certain critical temperature, metastable equilibrium states exist. By contrast, below this critical temperature, the system collapses and forms a Dirac peak. It has been shown that the model of selfgravitating Brownian particles shares numerous analogies with the chemotaxis of biological populations. In this thesis, we generalize these results to the multicomponent case, in which the particles can have different masses. In addition, we study the phase transitions between gaseous states and condensed states for a model of selfgravitating Brownian particles (or its biological analog) around a central body. Moreover, we show that the model of selfgravitating Brownian particles exhibits many analogies with the BoseEinstein condensation of free bosons strongly coupled with a thermal bath. This model corresponds to a canonical description (fixed temperature) of the BoseEinstein condensation. The coupling between a thermal bath and a system of free bosons induces a effective interaction between the bosons. This one forces them to condensate in their fundamental state when the temperature is less than a certain critical temperature. We then study the solutions of the bosonic FokkerPlanck equation of this problem which leads to the formation of a Dirac peak, modeling the condensate. In the second part of this thesis, we study the freely decaying twodimensional turbulence. Twodimensional turbulence has the striking property to generate a set of coherent structures called vortices. If the turbulent system evolves freely (without any external forcing), the turbulent fluid decays due to the merging processes of likesign vortices. Some studies have shown that twobody merging processes are dominant for large vortex densities whereas there are inefficient at very low density: in this case, the evolution is dominated by threebody processes
2 editions published in 2007 in French and held by 2 WorldCat member libraries worldwide
This thesis is dedicated to the study of the dynamical properties of various systems of interacting random walkers. In the first part of this manuscript, we study a model of selfgravitating Brownian particles. In this model, the particles evolve at fixed temperature. This corresponds to a canonical description of selfgravitating systems. When the temperature is above a certain critical temperature, metastable equilibrium states exist. By contrast, below this critical temperature, the system collapses and forms a Dirac peak. It has been shown that the model of selfgravitating Brownian particles shares numerous analogies with the chemotaxis of biological populations. In this thesis, we generalize these results to the multicomponent case, in which the particles can have different masses. In addition, we study the phase transitions between gaseous states and condensed states for a model of selfgravitating Brownian particles (or its biological analog) around a central body. Moreover, we show that the model of selfgravitating Brownian particles exhibits many analogies with the BoseEinstein condensation of free bosons strongly coupled with a thermal bath. This model corresponds to a canonical description (fixed temperature) of the BoseEinstein condensation. The coupling between a thermal bath and a system of free bosons induces a effective interaction between the bosons. This one forces them to condensate in their fundamental state when the temperature is less than a certain critical temperature. We then study the solutions of the bosonic FokkerPlanck equation of this problem which leads to the formation of a Dirac peak, modeling the condensate. In the second part of this thesis, we study the freely decaying twodimensional turbulence. Twodimensional turbulence has the striking property to generate a set of coherent structures called vortices. If the turbulent system evolves freely (without any external forcing), the turbulent fluid decays due to the merging processes of likesign vortices. Some studies have shown that twobody merging processes are dominant for large vortex densities whereas there are inefficient at very low density: in this case, the evolution is dominated by threebody processes
Etude de systèmes de spins complexes ou désordonnés : analogies avec la transition vitreuse structurelle by
Raphaël Cherrier(
Book
)
2 editions published in 2003 in French and held by 2 WorldCat member libraries worldwide
2 editions published in 2003 in French and held by 2 WorldCat member libraries worldwide
Interactions induites par un environnement fluctuant by
Vincent Démery(
Book
)
2 editions published in 2012 in French and held by 2 WorldCat member libraries worldwide
The interaction between two objects is, most of the time, carried by their environment. The properties of the environment allow one to compute the features of the interaction felt between the objects. This computation is presented in this thesis in two different situations. The first part deals with the effect of a fluctuating environment on a moving object. The mean force is computed for an object moving at constant speed and coupled linearly or quadratically to its environment. In the last case, the drag force is only due to fluctuations and is thus a Casimir drag. The diffusion coefficient is then computed for a weak linear coupling, generalising known results for diffusion in a quenched potential. The computations are valid for a very general form of environment, and can be applied to proteins diffusing in fluctuating lipid membranes. The second part is about systems of ions between two charged plates. The first studied system is a onedimensionnal model of ionic liquid on a lattice for which the pressure and the charge density can be computed exactly. The second system contains polarizable ions; the effects of polarisability on the pressure and the charge density are looked at in two limiting cases
2 editions published in 2012 in French and held by 2 WorldCat member libraries worldwide
The interaction between two objects is, most of the time, carried by their environment. The properties of the environment allow one to compute the features of the interaction felt between the objects. This computation is presented in this thesis in two different situations. The first part deals with the effect of a fluctuating environment on a moving object. The mean force is computed for an object moving at constant speed and coupled linearly or quadratically to its environment. In the last case, the drag force is only due to fluctuations and is thus a Casimir drag. The diffusion coefficient is then computed for a weak linear coupling, generalising known results for diffusion in a quenched potential. The computations are valid for a very general form of environment, and can be applied to proteins diffusing in fluctuating lipid membranes. The second part is about systems of ions between two charged plates. The first studied system is a onedimensionnal model of ionic liquid on a lattice for which the pressure and the charge density can be computed exactly. The second system contains polarizable ions; the effects of polarisability on the pressure and the charge density are looked at in two limiting cases
Electroperméabilisation de systèmes modèles by
Thomas Portet(
Book
)
2 editions published in 2010 in French and held by 2 WorldCat member libraries worldwide
L'électroperméabilisation est un procédé fondé sur l'application d'impulsions électriques qui peuvent induire une perméabilisation réversible de la membrane plasmique de cellules vivantes. En d'autres termes: si vous soumettez une cellule à des impulsions électriques d'amplitude et de durée judicieusement choisies, vous serez alors en mesure d'introduire dans son cytoplasme des molécules d'intérêt autrement incapables de traverser son enveloppe externe, et ce sans affecter sa viabilité. Cette technique a donné lieu à diverses applications, notamment dans le cadre de la lutte contre le cancer ou des thérapies géniques. Comportant moins de risques que les méthodes de transfection virales ou chimiques, son usage est de plus en plus répandu dans la communauté médicale. Cependant, les processus de réorganisation de la membrane, au niveau microscopique, sont encore méconnus et sujets à débat. Une meilleure description de ces phénomènes permettrait d'améliorer l'efficacité et la sécurité des protocoles de traitement. Une stratégie possible pour accroître notre compréhension de l'électroperméabilisation consiste en la réalisation d'expériences sur des systèmes modèles. Cette thèse aborde l'étude de l'effet d'impulsions électriques perméabilisantes de longue durée (quelques millisecondes) sur des systèmes lipidiques artificiels, des vésicules unilamellaires géantes. Il est décrit comment ce travail sur systèmes modèles a contribué à améliorer notre compréhension fondamentale de l'électroperméabilisation, mais aussi comment il a donné lieu à deux catégories d'applications: le chargement de vésicules avec des macromolécules et la mesure de grandeurs physiques caractéristiques des bicouches lipidiques, les tensions de bord. Ces recherches comportent aussi un aspect de modélisation de l'entrée dans des cellules électroperméabilisées de différentes molécules, via la résolution numérique d'équations aux dérivées partielles gouvernant l'évolution de leur concentration. Cette partie apporte des éléments de réponse visant à expliquer les différences observées expérimentalement entre le transfert de petites et de macromolécules
2 editions published in 2010 in French and held by 2 WorldCat member libraries worldwide
L'électroperméabilisation est un procédé fondé sur l'application d'impulsions électriques qui peuvent induire une perméabilisation réversible de la membrane plasmique de cellules vivantes. En d'autres termes: si vous soumettez une cellule à des impulsions électriques d'amplitude et de durée judicieusement choisies, vous serez alors en mesure d'introduire dans son cytoplasme des molécules d'intérêt autrement incapables de traverser son enveloppe externe, et ce sans affecter sa viabilité. Cette technique a donné lieu à diverses applications, notamment dans le cadre de la lutte contre le cancer ou des thérapies géniques. Comportant moins de risques que les méthodes de transfection virales ou chimiques, son usage est de plus en plus répandu dans la communauté médicale. Cependant, les processus de réorganisation de la membrane, au niveau microscopique, sont encore méconnus et sujets à débat. Une meilleure description de ces phénomènes permettrait d'améliorer l'efficacité et la sécurité des protocoles de traitement. Une stratégie possible pour accroître notre compréhension de l'électroperméabilisation consiste en la réalisation d'expériences sur des systèmes modèles. Cette thèse aborde l'étude de l'effet d'impulsions électriques perméabilisantes de longue durée (quelques millisecondes) sur des systèmes lipidiques artificiels, des vésicules unilamellaires géantes. Il est décrit comment ce travail sur systèmes modèles a contribué à améliorer notre compréhension fondamentale de l'électroperméabilisation, mais aussi comment il a donné lieu à deux catégories d'applications: le chargement de vésicules avec des macromolécules et la mesure de grandeurs physiques caractéristiques des bicouches lipidiques, les tensions de bord. Ces recherches comportent aussi un aspect de modélisation de l'entrée dans des cellules électroperméabilisées de différentes molécules, via la résolution numérique d'équations aux dérivées partielles gouvernant l'évolution de leur concentration. Cette partie apporte des éléments de réponse visant à expliquer les différences observées expérimentalement entre le transfert de petites et de macromolécules
David Dean : the spread offense quick passing game(
Visual
)
1 edition published in 2015 in English and held by 2 WorldCat member libraries worldwide
Coach David Dean shows how to make offense look complex and score
1 edition published in 2015 in English and held by 2 WorldCat member libraries worldwide
Coach David Dean shows how to make offense look complex and score
Interactions induites par un environnement fluctuant by
Vincent Démery(
)
1 edition published in 2012 in French and held by 1 WorldCat member library worldwide
L'interaction entre deux objets est, le plus souvent, transportée par leur environnement. Les caractéristiques de ce dernier permettent de calculer les propriétés de l'interaction ressentie entre ces objets. Cette thèse présente ce calcul dans deux situations différentes. La première partie concerne l'effet d'un environnement fluctuant sur le mouvement d'un seul objet. La force moyenne est calculée pour un objet avançant à vitesse constante et couplé linéairement puis quadratiquement à son environnement. Dans ce dernier cas le frottement ressenti est entièrement dû aux fluctuations : il s'agit d'un frottement de Casimir. Le coefficient de diffusion est calculé pour un couplage linéaire faible, généralisant au passage des résultats connus pour la diffusion dans un potentiel gelé. Ces calculs sont faits pour une classe très générale d'environnements, et peuvent être appliqués à la diffusion de protéines dans des membranes lipidiques fluctuantes. La deuxième partie traite de systèmes contenant des ions entre deux plaques chargées. Le premier système étudié est un modèle unidimensionnel de liquide ionique sur réseau pour lequel la pression et la densité de charge peuvent être calculées exactement. Le deuxième système est composé d'ions polarisables ; les effets de la polarisabilité sur la pression et la densité de charge y sont étudiés dans deux limites distinctes
1 edition published in 2012 in French and held by 1 WorldCat member library worldwide
L'interaction entre deux objets est, le plus souvent, transportée par leur environnement. Les caractéristiques de ce dernier permettent de calculer les propriétés de l'interaction ressentie entre ces objets. Cette thèse présente ce calcul dans deux situations différentes. La première partie concerne l'effet d'un environnement fluctuant sur le mouvement d'un seul objet. La force moyenne est calculée pour un objet avançant à vitesse constante et couplé linéairement puis quadratiquement à son environnement. Dans ce dernier cas le frottement ressenti est entièrement dû aux fluctuations : il s'agit d'un frottement de Casimir. Le coefficient de diffusion est calculé pour un couplage linéaire faible, généralisant au passage des résultats connus pour la diffusion dans un potentiel gelé. Ces calculs sont faits pour une classe très générale d'environnements, et peuvent être appliqués à la diffusion de protéines dans des membranes lipidiques fluctuantes. La deuxième partie traite de systèmes contenant des ions entre deux plaques chargées. Le premier système étudié est un modèle unidimensionnel de liquide ionique sur réseau pour lequel la pression et la densité de charge peuvent être calculées exactement. Le deuxième système est composé d'ions polarisables ; les effets de la polarisabilité sur la pression et la densité de charge y sont étudiés dans deux limites distinctes
Étude de modèles dynamiques pour la transition vitreuse by
Clément Touya(
Book
)
in French and held by 1 WorldCat member library worldwide
This thesis details the study of dynamical models in the framework of the glass transition. A full understanding of this phenomenon is still eluding modern physics. By means of toy model's, we thus study some properties which are typical of this transition. For example, when you come close to the transition, the relaxation dynamic of the system slows down dramatically. In order to study those systems, truly out of equilibrium, the main paradigm we use in this thesis is the disordered systems. Indeed, under some circumstances, an analogie exists between a model with disorder, and a real system which exhibit a true structural glass transition. If the interaction is short ranged, the relaxation time can be linked to the diffusion constant of the medium. If it vanishes, we have then a crossover between a diffusive and a subdiffusive regime. This dynamical transition is then similar to the glass transition. In this spirit, we focused on the study of dipoles diffusing in a random electrical field. In this model, the disorder is given by the random electrical potential which gives birth to the field, and the most natural choice is then to take a Gaussian statistic for the potential. In an adiabatique limit, where the dipole adapt instantaneously to the local field, the model just reduces to a particle diffusing in a squared Gaussian effective potential. we show here, exactly in one dimension, and through a renormalization group analysis in higher dimension, that the diffusion constant vanishes for a critical nonzero temperature where the dynamic get frozen like in real glass. We show also that beyond this adiabatique approximation, the transition remain at the same critical temperature in one dimension
in French and held by 1 WorldCat member library worldwide
This thesis details the study of dynamical models in the framework of the glass transition. A full understanding of this phenomenon is still eluding modern physics. By means of toy model's, we thus study some properties which are typical of this transition. For example, when you come close to the transition, the relaxation dynamic of the system slows down dramatically. In order to study those systems, truly out of equilibrium, the main paradigm we use in this thesis is the disordered systems. Indeed, under some circumstances, an analogie exists between a model with disorder, and a real system which exhibit a true structural glass transition. If the interaction is short ranged, the relaxation time can be linked to the diffusion constant of the medium. If it vanishes, we have then a crossover between a diffusive and a subdiffusive regime. This dynamical transition is then similar to the glass transition. In this spirit, we focused on the study of dipoles diffusing in a random electrical field. In this model, the disorder is given by the random electrical potential which gives birth to the field, and the most natural choice is then to take a Gaussian statistic for the potential. In an adiabatique limit, where the dipole adapt instantaneously to the local field, the model just reduces to a particle diffusing in a squared Gaussian effective potential. we show here, exactly in one dimension, and through a renormalization group analysis in higher dimension, that the diffusion constant vanishes for a critical nonzero temperature where the dynamic get frozen like in real glass. We show also that beyond this adiabatique approximation, the transition remain at the same critical temperature in one dimension
Phase diagram of a bulk 1d lattice Coulomb gas(
)
1 edition published in 2016 in English and held by 1 WorldCat member library worldwide
1 edition published in 2016 in English and held by 1 WorldCat member library worldwide
Sampletosample fluctuations of electrostatic forces by generated by quenched charge disorder by
David S Dean(
)
1 edition published in 2011 in English and held by 1 WorldCat member library worldwide
1 edition published in 2011 in English and held by 1 WorldCat member library worldwide
Sampletosample torque fluctuations in a system of coaxial randomly charged surfaces(
)
1 edition published in 2012 in English and held by 1 WorldCat member library worldwide
Polarizable randomly charged dielectric objects have been recently shown to exhibit longrange lateral and normal interaction forces even when they are effectively netneutral. These forces stem from an interplay between the quenched statistics of random charges and the induced dielectric image charges. This type of interaction has recently been evoked to interpret measurements of Casimir forces in vacuo, where a precise analysis of such disorderinduced effects appears to be necessary. Here we consider the torque acting on a randomly charged dielectric surface (or a sphere) mounted on a central axle next to another randomly charged surface and show that although the resultant mean torque is zero, its sampletosample fluctuation exhibits alongrange behavior with the separation distance between the juxtaposed surfaces and that, in particular, its rootmeansquare value scales with the total area of the surfaces. Therefore, the disorderinduced torque between tworandomly charged surfaces is expected to be much more pronounced than the disorderinduced lateral force and may provide an effective way to determine possible disorder effects in experiments, in a manner that is independent of the usual normal force measurement
1 edition published in 2012 in English and held by 1 WorldCat member library worldwide
Polarizable randomly charged dielectric objects have been recently shown to exhibit longrange lateral and normal interaction forces even when they are effectively netneutral. These forces stem from an interplay between the quenched statistics of random charges and the induced dielectric image charges. This type of interaction has recently been evoked to interpret measurements of Casimir forces in vacuo, where a precise analysis of such disorderinduced effects appears to be necessary. Here we consider the torque acting on a randomly charged dielectric surface (or a sphere) mounted on a central axle next to another randomly charged surface and show that although the resultant mean torque is zero, its sampletosample fluctuation exhibits alongrange behavior with the separation distance between the juxtaposed surfaces and that, in particular, its rootmeansquare value scales with the total area of the surfaces. Therefore, the disorderinduced torque between tworandomly charged surfaces is expected to be much more pronounced than the disorderinduced lateral force and may provide an effective way to determine possible disorder effects in experiments, in a manner that is independent of the usual normal force measurement
Tracking nonequilibrium in living matter and selfpropelled systems by
Etienne Fodor(
)
1 edition published in 2016 in English and held by 1 WorldCat member library worldwide
Living systems operate far from equilibrium due to the continuous injection of energy provided by ATP supply. The dynamics of the intracellular components, such as proteins, organelles and cytoskeletal filaments, are driven by both thermal equilibrium fluctuations, and active stochastic forces generated by the molecular motors. Tracer particles are injected in living cens to study these fluctuations. To sort out genuine nonequilibrium fluctuations from purely thermal effects, measurements of spontaneous tracer fluctuations and of response are combined. We theoretically rationalize the observed fluctuations with a phenomenological model. This model, in turn, allows us to quantify the time, length and energy scales of the active fluctuations in three different experimental systems: living melanoma cells, living mouse oocytes, and epithelial tissues. Selfpropelled particles are able to extract energy from their environment to perform a directed motion. Such a dynamics lead to a rich phenomenology that cannot be accounted for by equilibrium physics arguments. A striking example is the possibility for repulsive particles to undergo a phase separation, as reported in both experimental and numerical realizations. On a specific model of selfpropulsion, we explore how far from equilibrium the dynamics operate. We quantify the breakdown of the irreversibility of the dynamics, and we delineate a bona fide effective equilibrium regime. Our insight into this regime is based on the analysis of fluctuations and response of the particles
1 edition published in 2016 in English and held by 1 WorldCat member library worldwide
Living systems operate far from equilibrium due to the continuous injection of energy provided by ATP supply. The dynamics of the intracellular components, such as proteins, organelles and cytoskeletal filaments, are driven by both thermal equilibrium fluctuations, and active stochastic forces generated by the molecular motors. Tracer particles are injected in living cens to study these fluctuations. To sort out genuine nonequilibrium fluctuations from purely thermal effects, measurements of spontaneous tracer fluctuations and of response are combined. We theoretically rationalize the observed fluctuations with a phenomenological model. This model, in turn, allows us to quantify the time, length and energy scales of the active fluctuations in three different experimental systems: living melanoma cells, living mouse oocytes, and epithelial tissues. Selfpropelled particles are able to extract energy from their environment to perform a directed motion. Such a dynamics lead to a rich phenomenology that cannot be accounted for by equilibrium physics arguments. A striking example is the possibility for repulsive particles to undergo a phase separation, as reported in both experimental and numerical realizations. On a specific model of selfpropulsion, we explore how far from equilibrium the dynamics operate. We quantify the breakdown of the irreversibility of the dynamics, and we delineate a bona fide effective equilibrium regime. Our insight into this regime is based on the analysis of fluctuations and response of the particles
Écoulements au voisinage d'interfaces molles : les rôles de l'élasticité, la capillarité & les fluctuations by
Vincent Bertin(
)
1 edition published in 2021 in English and held by 1 WorldCat member library worldwide
In this manuscript, we study flows in the vicinity of soft interfaces through various systems. In a first part, we focus on elastohydrodynamic lubrication, and analyze the confined motion of a rigid sphere moving close to a soft surface. The hydrodynamic interactions between an oscillating sphere and the deformation of the surface allow us to characterize without contact the complex mechanical response of materials, such as viscoelasticity, poroelasticity or capillarity. Theoretical results are confronted with colloidalprobe atomic force microscopy experiments, allowing us to measure the rheology of elastomers and the surface tension of liquidair interfaces in the presence of impurities. Then, we calculate the forces and torques that apply on spheres that are free to move and rotate in all directions. The elastohydrodynamic lift force, measured experimentally, is in agreement with theoretical predictions for small surface deformations. In a second part, we focus on the dynamics of thin films. Through theoretical and experimental work on the capillary leveling of thin polymer films, we analyze the dynamics of films resting on an elastic substrate, bilayer films and freestanding films. A last part is dedicated to the diffusion of spheres in shear flows and near a wall. We analyze the enhancement of the effective diffusion coefficient induced by the coupling between diffusion and advection. Particular interest is given to the dynamics at short times compared with the diffusion time and to the interactions of the particles with the wall
1 edition published in 2021 in English and held by 1 WorldCat member library worldwide
In this manuscript, we study flows in the vicinity of soft interfaces through various systems. In a first part, we focus on elastohydrodynamic lubrication, and analyze the confined motion of a rigid sphere moving close to a soft surface. The hydrodynamic interactions between an oscillating sphere and the deformation of the surface allow us to characterize without contact the complex mechanical response of materials, such as viscoelasticity, poroelasticity or capillarity. Theoretical results are confronted with colloidalprobe atomic force microscopy experiments, allowing us to measure the rheology of elastomers and the surface tension of liquidair interfaces in the presence of impurities. Then, we calculate the forces and torques that apply on spheres that are free to move and rotate in all directions. The elastohydrodynamic lift force, measured experimentally, is in agreement with theoretical predictions for small surface deformations. In a second part, we focus on the dynamics of thin films. Through theoretical and experimental work on the capillary leveling of thin polymer films, we analyze the dynamics of films resting on an elastic substrate, bilayer films and freestanding films. A last part is dedicated to the diffusion of spheres in shear flows and near a wall. We analyze the enhancement of the effective diffusion coefficient induced by the coupling between diffusion and advection. Particular interest is given to the dynamics at short times compared with the diffusion time and to the interactions of the particles with the wall
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Related Identities
 Podgornik, Rudolf Editor
 Najʻī, ʻAlī Contributor Editor
 Dobnikar, Jure Contributor Editor
 Université Toulouse 3 Paul Sabatier (1969....). Degree grantor
 École doctorale des sciences physiques et de l'ingénieur (Talence, Gironde) Other
 Laboratoire Ondes et Matière d'Aquitaine Other
 Université de Bordeaux (2014....). Degree grantor
 SpringerLink (Online service) Other
 Cayssol, Jérôme (1975....). Other Opponent Thesis advisor
 Démery, V. Author