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Etude hydrodynamique des mélanges binaires thermosensibles

Abstract : Nanofluidics marks the emergence of promising new technologies for the production of blue energies. These renewable energies with low environmental impact harness the entropy of mixing of fresh and salt water, for example at the estuary of a river, to generate electricity. Diffusio-osmosis (which flow is associated with diffusiophoretic displacement) is a serious candidate for the generation of electric currents. This phenomenon stems from osmotic effects inside the nanopores of the membrane and its intensity is directly linked to the surface charge of the material. Waterionic liquid thermoresponsive binary mixtures are an alternative to rivers and oceans to generate a salt gradient. The monophasic or biphasic state of the mixture is controlled by temperature; in the present case the LCST nature of the fluid induces a demixing by heating. Our work focuses on the phase separation of the mixture in a microfluidic cavity, where we show that a confinement or temperature gradient is a precious help to selectively isolate the two phases. We also measure the intensity of diffusio-osmotic currents with these solutions of ionic liquids in single nanopores and multi-pore membranes.
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  • HAL Id : tel-03128661, version 1

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Marc Pascual. Etude hydrodynamique des mélanges binaires thermosensibles. Science des matériaux [cond-mat.mtrl-sci]. Université Paris sciences et lettres, 2020. Français. ⟨NNT : 2020UPSLS009⟩. ⟨tel-03128661⟩

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