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Interfacially driven transport theory: a way to unify Marangoni and Osmotic flows

Abstract : We show that the solvent behaviour in both diffusio-osmosis and Marangoni flow can be derived from a simple model of colloid-interface interactions. We demonstrate that the direction of the flow is regulated by a single value of the attractive parameter covering the purely repulsive and attractive – repulsive interaction cases. The proposed universality between diffusio-osmosis and Marangoni flow is extended further to include diffusio-phoresis. In particular, an object immersed to a colloidal solution moves towards the low concentration of the colloidal particles in the case of colloid-interface repulsion and towards the high concentration of the colloidal particles in the case of colloid-interface attraction. The approach combines the methods of fluid dynamics, molecular physics and transport phenomena and provides a tractable explanation of how the colloid-interface interactions affect the momentum balance and the transport phenomena (interfacially driven transport).
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Submitted on : Monday, May 20, 2019 - 4:39:23 PM
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Patrice Bacchin, Kirill Glavatskiy, Vincent Gerbaud. Interfacially driven transport theory: a way to unify Marangoni and Osmotic flows. Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2019, pp.1-11. ⟨10.1039/c9cp00999j⟩. ⟨hal-02134681⟩

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