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Dynamic and instabilities at soft interfaces

Abstract : This thesis is divided into two parts. In the first part, we study several properties of waves at the surface of a liquid; in particular the wake generated at the interface by an object modelled by a pressure field. When an object with constant speed moves atop the surface, it generates a wake. The radiation of these waves results in a loss of energy for the operator putting the object in motion, which results in a resultant force opposite to the motion called the wave resistance, calculated by the Havelock formula. In the stationary regime, we propose here a demonstration of the Havelock formula for any movement on the surface. The wake and wave resistance are also studied using elastohydrodynamic coupling at the surface. We then model the waves generated by a water strider during its propulsion phase.In the second part, we propose a model of cooperative strings inspired by the empirical law of Adam and Gibbs for the glass transition. This model allows us to study glass transition anomalies in a confined environment, in particular the reduction of glass transition temperature in thin films and nanoparticles of polystyrenes. Finally, we consider calculations of chain statistics in confined environments and their exact dependencies on molecular weight.
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Submitted on : Thursday, October 14, 2021 - 3:16:10 PM
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  • HAL Id : tel-03378220, version 1



Maxence Arutkin. Dynamic and instabilities at soft interfaces. Physics [physics]. Université Paris sciences et lettres, 2018. English. ⟨NNT : 2018PSLET044⟩. ⟨tel-03378220⟩



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