WorldCat Identities

Bartolo, Denis

Works: 20 works in 26 publications in 2 languages and 55 library holdings
Roles: Thesis advisor, Opponent, Other, Author
Publication Timeline
Most widely held works by Denis Bartolo
L'eau à découvert by Luc Abbadie( )

2 editions published in 2017 in French and held by 27 WorldCat member libraries worldwide

Indispensable à la régulation du climat, au développement de la vie sur Terre, au maintien des écosystèmes, aux populations, au développement de l'agriculture, de l'industrie comme à la production d'énergie, l'eau est un élément vital. Il convient donc, dans un contexte de changement global, d'analyser dans toute sa diversité la place et le rôle de l'eau et de se donner ainsi les moyens de mieux la préserver. Autour de cet enjeu qui engage toute l'humanité, Agathe Euzen, Catherine Jeandel et Rémy Mosseri ont réuni près de cent cinquante contributions, visant à apporter un éclairage sur chacun des domaines et des approches que couvre cette thématique. Quelle est l'origine de l'eau? Son rapport avec l'apparition de la vie? Quel rôle a-t-elle joué dans l'histoire de la planète et dans le développement de la vie végétale, animale et humaine? Quel est son cycle? Quelles sont ses propriétés chimiques? Comment les sociétés se sont-elles emparées de cet élément précieux? Allons-nous manquer d'eau? L'eau est-elle source de conflits? Comment l'eau est-elle gérée? Comment recycle-t-on une eau polluée? Quels sont les risques pour la santé mondiale? Quels sont les grands enjeux liés à l'eau au xxie siècle? Comprendre et proposer des solutions à ces défis majeurs est l'intention de cet ouvrage
Forces et fluctuations : forces induites par l'agitation et réponse d'adhésifs moléculaires by Denis Bartolo( Book )

2 editions published in 2003 in French and held by 3 WorldCat member libraries worldwide

Dynamique collective de colloïdes auto-propulsés by Antoine Bricard( Book )

2 editions published in 2014 in French and held by 2 WorldCat member libraries worldwide

This Since 1995 and the introduction of the Vicsek model, the physicist community has shown a growing interest for active matter and particularly polar active matter. There has been a lot of theoretical and numerical works, but few physical experimental systems which display a flocking dynamic. In 2011, none of them aliows both to handle a very large number of particules and to identify and deeply understand the details of the interactions and the propulsion mechanism. With this thesis, we hoped to fil this void. We achieved this goal by propelling colloids with a electrohydrodynamic effect known as Quincke electro-rotation. We studied these colloids, which we named Quincke rollers, in different geometries. Studying them in a stadium-shaped potential with periodic boundary conditions, we found a flocking phenomenology similar to one emerging from the Vicsek model. We observed and fully characterized three phases, a disordered isotropic gas, ordered, inhomogeneous, anisotropie bands and an ordered, homogeneous, isotropic polar liquid. This polar liquid is the very first to be observed in a laboratory. Then we studied an assembly of Quincke rollers in a circular confinement, and observed an characterized the transition between an isotropic gas and an inhomogeneous and partially ordered vortex. Finally, we shortly describe the phases and the transition that occur in more complex confinements. Each time we used our full understanding of microscopic mechanisms of the propulsion and the interactions to successfully confront the experimental results to relevant theoretical models
Etude des propriétés de transport de mousse dans des modèles de milieux poreux by Alexis Mauray( )

1 edition published in 2017 in French and held by 2 WorldCat member libraries worldwide

In enhanced oil recovery (EOR), foams are injected in porous media to improve oil recovery efficiency. The objective is to limit viscous fingering thanks to the high effective viscosity of the foam at low capillary number Ca. Foam is produced by the co-injection of a gas and a solution of surfactants. This thesis focuses on foam formation and transport mechanisms in model porous media using a heterogeneous micromodel made in NOA. Foam formation is studied using two different approaches. The first one consists in studying a co-injection of two fluids thanks to a jet flowing in the center of the system. This experiment shows that the less wetting fluids is dispersed in the other one when the capillary number is higher than 10-5. A second set of experiments is conducted by injected a pre-formed train of big bubbles in model a porous media. The bubbles divide until they reach a diameter of the order of to the pore size, for high enough capillary numbers Ca. Besides, we studied the transport properties of foam in similar model porous media. Direct measurements show that the pressure drop induces by the flow can be at Ca=10-6 as high as 3000 times the pressure corresponding to water injected at the same injection flow rate. This ratio decreases with capillary number. An analysis of the preferential paths by direct observations shows that, for low relative gas flow rate, only a few paths are active. However, an increase of the capillary number or if relative gas flow rate leads to a homogenization of the flow in the medium. Thanks to different simple models of straight or wavy channels, we measure that the pressure drop induced by a single bubble is in good agreement with Bretherton's law, and scales as Ca2/3. However, in wavy channels the pressure drop due to a single bubble deviates from this prediction and exhibits a plateau at Ca lower than 10-4. In this regime, the motion of the bubble is usually intermittent. Finally, we focus on foam formation and transport properties in presence of oil. Our observations lead to the conclusion that for our setup and surfactant formulations, oil has a negligible influence
Auto-organisation, écho et trafic microfluidique by Raphaël Jeanneret( Book )

2 editions published in 2014 in English and held by 2 WorldCat member libraries worldwide

This research deals with the collective dynamics of particles advected by low Reynolds flows in confined geometry. The particles interact with each other via long-range hydrodynamic couplings which originate from the geometry or the topology of the system. This long-range coupling induces highly non-trivial dynamics that are studied via two main experiments. These two studies are related through the well-known property of hydrodynamic reversibility. This PhD-thesis combines tools from three main domains of physics : hydrodynamic, soft-matter and dynamical systems. The first system is composed of a 2D monodisperse emulsion confined in a Hele-Shaw cell and submitted to a periodic drive in order to probe the reversibility of the dynamics. This echo-experiment characterized by a reversible dynamics at the microscopic level exhibit a very clear first order transition between a macroscopic reversible state at low drive and a macroscopic irreversible state at large drive. Furthermore, it is shown that this transition is not merely dynamical but also structural. The second study is about the traffic dynamics of three droplets travelling in large microfluidic-loop networks. Combining numerical, analytical and experimental tools, it is shown that the asymptotic dynamics is Hamiltonian and reversible
Impact dynamics of surfactant laden drops: dynamic surface tension effects by Mounir Aytouna( )

1 edition published in 2009 in English and held by 2 WorldCat member libraries worldwide

Dynamique de trafic dans des réseaux microfluidiques modèles : embouteillages, chocs et avalanches by Nicolas Champagne( Book )

2 editions published in 2011 in French and held by 2 WorldCat member libraries worldwide

This thesis is devoted to the transport of particles in confined geometries. An original approach is developed, based on new home-made microfluidic tools. First, we study the traffic of particles in microfluidic obstacles networks. Due to hydrodynamics interactions between particles, we show that the traffic dynamics is a nonlinear process: the particle current does not scale with the particle density, We also establish that there exists a maximal current above which no stationary particle flow can be sustained. Then, we study the dynamic response of 1D droplet streams to finite-amplitude longitudinal perturbations. We experimentally and theoretically show that the nonlinear constitutive equation relating particle current to particle density leads to Burgers equation for the droplet stream density, Afterwards, we focus on the flow resulting from high current values in a 2D obstacles network, We observe an intermittent dynamics with avalanche phenomena. To rationalize this, we develop a numerical code close to a cellular automaton. This numerical model turns out to be effective to represent the flow of confined particles in a network of pipes. To conclude, we present the start of an experimental work, It consists in flowing a 2D crystal of solid particles. In such a configuration, hydrodynamic interactions seem to destabilize the lattice of any 2D crystals
Sounds and hydrodynamics of polar active fluids by Delphine Geyer( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Battement de flagelles artificiels : dynamique individuelle et collective by Naïs Coq( Book )

2 editions published in 2010 in French and held by 2 WorldCat member libraries worldwide

This work focuses on three microhydrodynamics problems, in which one or several soft structures interact with a viscous fluid. These structures are flexible filaments, inspired from biological flagella. In each case, a quantitative experimental study is combined with a minimal theoretical model, in order to capture the main features of the physics involved. The first system is a macroscopic elastic filament, rotating in a viscous fluid. As the rotation frequency increases, the filament undergoes a continuous but sharp transition, from an almost straight state to a helical shape, tightly wrapped around the rotation axis. Depending on the anchoring conditions, this shape transition may be associated with an unstable branch in the force/torque characteristic. The second system consists in magnetic artificial microcilia, made of self-assembled superparamagnetic colloids. We present the fabrication of these microfilaments, and their spatial organization into arrays of tunable geometry in microfluidic channels. The filaments precess around the vertical axis. We find a critical inclination between the magnetic field and the precession axis, above which the high-frequency response of a filament becomes asynchronous. This dynamic transition is due to a purely geometrical criterium, arising from the nature of the magnetic dipolar interaction. Last, due to long-range hydrodynamical coupling, the trajectories of the free ends of an array of precessing microfilaments show an unexpected shape transition. A minimal, two-body model brings physical insight, in semi-quantitative agreement with the experimental data
Hydrodynamics of polarized crowds : experiments and theory by Nicolas Bain( )

1 edition published in 2018 in English and held by 1 WorldCat member library worldwide

Modelling crowd motion is central to situations as diverse as risk prevention in mass events and visual effects rendering in the motion picture industry. The difficulty to perform quantitative measurements in model experiments, and the lack of reference experimental system, have however strongly limited our ability to model and control pedestrian flows. The aim of this thesis is to strengthen our understanding of human crowds, following two distinct approaches.First, we designed a numerical model to study the lane formation process among bidirectional flows of motile particles. We first evidenced the existence of two distinct phases: one fully laned and one homogeneously mixed, separated by a critical phase transition, unique to active systems. We then showed with a hydrodynamic approach that the mixed phase is algebraically correlated in the direction of the flow. We elucidated the origin of these strong correlations and proved that they were a universal feature of any system of oppositely moving particles, active of passive.Second, we conducted a substantial experimental campaign to establish a model experiment of human crowds. For that purpose we performed systematic measurements on crowds composed of tens of thousands of road-race participants in start corrals, a geometrically simple setup. We established that speed information propagates through polarized crowds over system spanning scales, while orientational information is lost in a few seconds. Building on these observations, we laid out a hydrodynamic theory of polarized crowds and demonstrated its predictive power
Colloidal flocks in challenging environments by Alexandre Morin( )

1 edition published in 2018 in English and held by 1 WorldCat member library worldwide

Le déplacement cohérent dirigé au sein de troupeaux, d'essaims, de nuées, prend place à toutes les échelles du vivant. En cherchant à rationaliser l'émergence de tels mouvements collectifs, les physiciens ont décrit ces assemblées comme des matériaux actifs. Ces matériaux sont formés de constituants auto-propulsés qui se déplacent spontanément dans une direction commune. Cette thèse expérimentale s'appuie sur la réalisation de troupeaux synthétiques pour explorer les propriétés de la matière active polaire dans des situations défavorables à son auto-organisation : leur dynamique en milieux désordonnés et leur réponse à des perturbations externes. Des rouleurs colloïdaux aux interactions d'alignement sont confinés au sein de dispositifs microfluidiques. Au-delà d'une densité seuil, ils forment un troupeau caractérisé par l'émergence d'un ordre en orientation de longue portée. Ces troupeaux colloïdaux font office de prototypes de la matière active polaire. Nous avons étudié la réponse d'un liquide actif polaire assemblé à partir de rouleurs colloïdaux. Nous avons montré que face à une perturbation longitudinale leur réponse est hystérétique. Nous avons expliqué théoriquement ce comportement non-linéaire et l'avons exploité pour réaliser des oscillateurs microfluidiques autonomes. Nous avons également étudié la dynamique de troupeaux colloïdaux qui se propagent dans des environnements hétérogènes. La présence d'obstacles distribués aléatoirement focalise les troupeaux le long de chemins privilégiés qui forment un réseau épars et tortueux. Augmenter le désordre conduit à la destruction du troupeau. Nous avons démontré que la suppression du mouvement collectif consiste en une transition discontinue, générique à tous les matériaux actifs polaires
Imbibition forcée en milieu poreux by Céleste Odier( )

1 edition published in 2017 in French and held by 1 WorldCat member library worldwide

Understanding two-phase flow in heterogeneous media is of great importance for a number of industrial processes. One of the most prominent examples is enhanced oil recovery which has driven fundamental and applied research in this fieldfor decades. However our understanding has remained extremely unbalanced. The case of spontaneous imbibition of a fluid in a porous medium is fairly well understood,whereas quantitative descriptions of forced imbibition in the presence of anunfavorable viscosity ratio is still lacking. Combining large-scale observations and confocal imaging of microfluidic experiments, we studied the morphology and dynamicsof forced imbibition in homogeneous porous media. We identify four classesof three-dimensional patterns resulting from different dynamics at the pore-scale, and having a clear signature on the macroscopic observables. By means of confocalmicroscopy allowing us to visualize three dimensional features of the local dynamics,we show that the transitions between the four imbibition scenarios result from two dynamical wetting transitions and one interfacial instability. In addition,unlike previous studies, we investigate the evolution of those patterns undercontinuous injection over long time scales. We evidence their aging according to acapillary-coarsening process
Effets collectifs dans la dynamique d'émulsions confinées : transition de dépiégeage et fonte hydrodynamique by Marine Le Blay( )

1 edition published in 2020 in French and held by 1 WorldCat member library worldwide

This thesis, motivated by the industrial challenges of the understanding of the mecanisms of enhanced oil recovery, sheds new light on the more fondamental problem of the transport of suspensions inconfined environments. Our goal is to understand how the interplays between structure, drive anddisorder shape the large-scale dynamics of driven two dimensional suspensions. By developing microfluidic model experiments, we adress the two following fundamental questions: the plastic depinning transition of an emulsion driven in a disordered media and the melting transition of cristalline emulsions induced by hydrodynamic fluctuations.On a first hand, we demonstrate that the mobilization of an emsulsion driven through a quenched disordered environment is a critical depinning transition. The criticality of the transition emerges fromthe interplay between the contact interactions and the focusing of the hydrodynamic drive in the mobilization pattern that takes the shape of a smectic river network. This transition shares common features with classical depinning transitions observed in systems such as Abrikosov vortex lattices orcharged colloïds in two dimensions. But it also displays strong differences which can be explained bythe strong coupling between the hydrodynamic drive and the mobilization structure that it induceslocally.On a second hand, we investigate the melting of crystals in two dimensions. While the stability ofcrystalline phases regarding thermal fluctuations has been elucidated recently, stability regarding outof-equilibrium fluctuations remains an open question. We established the melting of crystals driven by homogeneous hydrodynamic flow. We demonstrate experimentally that the flow does not only lead toa trivial translation of the crystal. The fluctuations of the fluid velocity field induce a first-order transition between a crystal and a disordered liquid. This melting is radically different from the two-steps melting scenario of Kosterlitz, Thouless, Halperin, Nelson and Young at equilibrium. The hydrodynamic fluctuations enable the coexistence between a liquid disordered phase and a cristalline phase withtout the intermediate hexatic one
Du mouvement au blocage collectif dans des assemblées de rouleurs colloïdaux : hydrodynamique et solidification des liquides polaires actifs by Delphine Geyer( )

1 edition published in 2019 in French and held by 1 WorldCat member library worldwide

Des mouvements collectifs dirigés émergent dans des systèmes très variés, depuis les assemblées synthétiques de grains vibrés jusqu'aux nuées d'oiseaux dans la nature. En essayant de comprendre le caractère générique de ces comportements dynamiques collectifs, les physiciens ont décrit les populations d'individus motiles comme des matériaux ordonnés.Dans cette thèse, nous réalisons expérimentalement des troupeaux synthétiques en laboratoire et nous explorons leurs propriétés hydrodynamiques.Nous tirons avantage du mécanisme d'électro rotation de Quincke pour motoriser des millions de colloïdes. Ces rouleurs de Quincke sont capables de s'auto-organiser pour former un troupeau appelé liquide polaire où toutes les particules se déplacent en moyenne dans la même direction.Nous montrons que la dynamique de ce liquide polaire est très bien décrite par des prédictions théoriques laissées sans preuves expérimentales depuis vingt-cinq ans. En particulier,nous démontrons que deux modes sonores s'y propagent et nous montrons que l'étude de leur spectre fournit une méthode non invasive pour mesurer ses constantes hydrodynamiques.Finalement, nous montrons que le mouvement dirigé peut être supprimé collectivement dans un troupeau dense. Un solide actif peut nucléer et se propager à contre-courant dans le liquide polaire. Nous établissons que cette solidification est une transition du premier ordre et qu'il s'agit de la première démonstration expérimentale complète d'une séparation de phase induite par la motilité des particules actives (aussi appelée MIPS)
Dynamique collective de particules auto-propulsées : ondes, vortex, essaim, tressage by Jean-Baptiste Caussin( )

1 edition published in 2015 in English and held by 1 WorldCat member library worldwide

The emergence of coherent motion at large scale has been widely observed in animal populations (bird flocks, fish schools, bacterial swarms...) and more recently in artificial systems. Such ensembles of self-propelled individuals, capable of aligning their velocities, are commonly referred to as polar active materials. They display unique physical properties, which we investigate in this theoretical thesis.We first describe a population of self-propelled colloids. In strong connection with the experiments, we model the dynamics from the individual level to the macroscopic scale. The theoretical results account for the emergence and the structure of coherent patterns: (i)~transition to collective motion, (ii)~propagation of polar spatial structures, (iii)~damping of density fluctuations in a polar liquid, (iv)~heterogeneous vortex in confined geometries.We then follow a more formal perspective, and study the non-linear excitations which propagate in polar active systems. We analyze the hydrodynamic theories of active matter using a dynamical-system framework. This approach makes it possible to rationalize the experimental and numerical observations reported so far.Finally, we propose a complementary approach to characterize active populations. Combining numerical and analytical results, we study the geometric properties of the individual trajectories and their entanglement within three-dimensional flocks. We suggest that these observables should provide powerful tools to describe animal flocks in the wild
Dynamiques d'imbibition en milieu confiné by Bertrand Levaché( )

1 edition published in 2014 in French and held by 1 WorldCat member library worldwide

This experimental thesis deals with imbibition in confined media. This situation occurs when a fluid which preferentially wets the solid displaces another immiscible fluid. The divergence of the viscous stress at the contact line with the solid complicates the description of both the shape and the invasion dynamic of the meniscus that can no longer be described, even at the macroscopic length scale of the solid confinement, by only the displacement of a homogeneous liquid front. The absence of any intrinsic fluids length scale requires to take into account the coupling between the interface shape and the flow at all scales, from nanometers (molecular interaction) to solid confinement scale (hundred micrometers in our experiments). Multi-scale behavior will be the central point of this thesis. Using new microfluidics tools, we first made a quantitative study of imbibitions in Hele-Shaw geometry. We demonstrate a new class of liquid entrainment transition both experimentally and numerically. In addition, an extensive analysis of our numerical model shows that it consistently describes all scenarios that have been reported so far. We then study imbibitions in model porous media. We demonstrate a new invasion process, where the flow occurs along the corner of the porous? obstacles, that generalizes the previous entrainment. We finally propose a geometric criterion that discriminates between the different invasion scenarios
Fast Prototyping of Silica Glass Microfluidic Chips: The Sol-Gel Route( )

1 edition published in 2018 in English and held by 1 WorldCat member library worldwide

Abstract: A combination of material, patterning, and sealing method is introduced to replicate and assemble monolithic microfluidic chips made of hybrid silica glass (HSG). First, it is shown how to prepare sols suited to the replication of complex geometries out of range of conventional etching methods. Second, it is shown how to tailor the surface properties of HSG devices. The performances and the simplicity of this fast prototyping method are demonstrated using quantitative mechanical, optical, and physicochemical characterization techniques and benchmark microfluidic experiments. Finally, the high potential of HSG microfluidics to oil-recovery and chemistry applications in benchmark experiments on crude oils is established. Abstract : A new prototyping method in hybrid silica glass for microfluidic applications is presented--a unique combination of sol-gel chemistry, patterning, and sealing methods that overcomes the complexities of glass etching and the typical scale limitation of sol-gel based microfabrication. Micropatterns with submicron resolution and outstanding optical properties are implemented in complex microfluidic networks that are compatible with high-pressure applications in the presence of organic solvents
Interactions médiées dans la matière molle et tension de surface des fluides actifs. by Ruben Zakine( )

1 edition published in 2019 in English and held by 1 WorldCat member library worldwide

This thesis focuses on two topics ubiquitous in soft matter: first, mediated interactions between nano-to-micrometer sized objects, second, surface tension in out-of-equilibrium systems. The first part of this thesis is devoted to the properties of a system of particles whose interactions are mediated by a fluctuating background. We start with a nonequilibrium study and we show that the combination of mediated interactions and of the nonequilibrium drive leads to complex structures. Our predictions, beyond statistical mechanical methods, rest on extending the methods of nonlinear dynamics in pattern forming systems, to systems with a local conservation law. The second study of this part is dedicated to an equilibrium experimental system of colloidal particles embedded in lyotropic lamellar phases. Relying on a bottom-up approach, we implement the details of the interaction between each colloidal particle and each lamella to come up with an exact description of the effective force emerging between colloids. These analytical results are then used to discriminate between two types of interaction, both being possibly encountered in experiments. The second part of this thesis focuses on the notion of surface tension for interfaces involving active fluids. We will come up with a definition relating macroscopic forces to microscopic ones, either between particles or, when applicable, between particles and a confining medium. When the active fluid is in contact with a solid boundary, the solid-fluid surface tension is, in general, a more complex quantity than its equilibrium counterpart. By this we mean that its value may depend on the geometry or other details of the measuring device. We will also show that a carefully designed probe allows us to access an equation-of-state-abiding surface tension akin to its equilibrium counterpart. Liquid-vapor interfaces can also be encountered in assemblies of self-propelled particles when these undergo a motility-induced phase separation. We show also that the surface tension associated to a liquid-vapor interface possesses a mechanical definition that echoes the equilibrium one
Matière active polaire : ordre, désordre et défauts topologiques by Amélie Chardac( )

1 edition published in 2021 in French and held by 1 WorldCat member library worldwide

A host of collective dynamics are observed at all scales in Nature when living creatures and cells interact, forming swarms, herds and flocks. From a physicists' perspective, assemblies of self propelled bodies propelling along a common direction can be either thought as ordered condensed matter or as spontaneously flowing fluids. This experimental thesis is based on the realization ofsynthetic active liquids flowing spontaneously in microfluidic geometries. I use this model system toaddress the self-organisation of polar active matter and its robustness to geometric disorder. Inert colloids are motorized taking advantage of the Quincke rotation mechanism. When confined in microfluidic devices, interacting colloidal particules self-organize into synthetic flockswhere millions of rollers propel coherently and display long-range orientational order. I first show how the coupling between topological defects and active flows control theordering dynamics of polar liquids. To do so I provide a quantitative description of the geometry and dynamics of topological defects in polar active matter. I demonstrate the atypical existence of domainwalls emanating from -1 topological charges and explain their stabilisation as a result of a competition between density gradients and self-advection. I explain how topological defects annihilate along adomain wall network and account for the self-similar kinetics leading to the emergence of an ordered liquid devoid of any topological singularity or geometric distortions. I then address the flow of active liquids in heterogeneous environments. How is collectivemotion destabilized when challenged by geometric disorder ? To answer this question, I combine active-microfluidic experiments based on a colloidal polar liquid flowing through microfluidic devices patterned with controlled but random distributions of repelling isotropic obstacles Beyond a critical fraction of obstacles, long-range orientational order is destroyed: the stationary flows are tortuous and organized around a finite density of frozen topological defects. I reveal a new emerging state of active matter with no counterpart in equilibrium: a dynamic vortex glass, analogous to vortex glasses in dirty superconductors
Emulsions microfluidiques et rouleurs colloïdaux : effets collectifs en matière molle forcée hors-équilibre by Nicolas Desreumaux( )

1 edition published in 2015 in French and held by 1 WorldCat member library worldwide

Emulsions, suspensions colloïdales, solutions polymères, suspensions bactériennes, ... Les propriétés dynamiques de ces systèmes dispersés reposent sur l'interaction entre la structure microscopique de la phase dispersée et l'écoulement de la phase continue.Le travail présenté dans cette thèse porte sur la dynamique collective de telles suspensions forcées hors-équilibre. Le forçage peut avoir lieu à l'échelle macroscopique (advection, force uniforme, ...) ou à l'échelle microscopique (auto-propulsion).Le dénominateur commun à toutes mes études est de chercher à comprendre la dynamique grande échelle des suspensions sur la base des symétries des interactions, principalement hydrodynamiques, entre les particules.Notre approche est expérimentale et repose sur l'utilisation d'outils microfluidiques pour réaliser des expériences modèles quantitatives.Dans la première partie du manuscrit, j'étudie la dynamique de suspensions de particules passives rigidement confinées au sein d'un film fluide. En particulier, je présente nos résultats expérimentaux et théoriques sur la propagation d'ondes de densité linéaires au sein de telles suspensions. Dans la seconde partie du manuscrit, je m'intéresse à la dynamique d'assemblées bidimensionnelles de particules auto-propulsées en mouvement dans un fluide globalement au repos. Je présente notre système expérimental, basé sur un mode de propulsion original des particules, et qui permet d'étudier et de comprendre l'émergence du mouvement collectif sur la base des interactions de paires. J'étudie ensuite la propagation des excitations non linéaires de ces assemblées de particules dans des milieux hétérogènes
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Alternative Names
Denis Bartolo onderzoeker

French (17)

English (9)