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- W2992728613 abstract "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, rests 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." @default.
- W2992728613 created "2019-12-13" @default.
- W2992728613 creator A5004541301 @default.
- W2992728613 date "2019-09-20" @default.
- W2992728613 modified "2023-10-03" @default.
- W2992728613 title "Mediated interactions in soft matter and surface tension of active fluids" @default.
- W2992728613 hasPublicationYear "2019" @default.
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