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

Patrice Bacchin (1) , Kirill Glavatskiy (2) , Vincent Gerbaud (1)

1 LGC - Laboratoire de Génie Chimique
2 The University of Sydney

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).

Mots clés: Interface; Colloids; Marangoni; Osmosis; Diffusion; Diffusio-phoresis

Domaines: Génie chimique; Génie des procédés

Patrice Bacchin, Kirill Glavatskiy, Vincent Gerbaud. Interfacially driven transport theory: a way to unify Marangoni and Osmotic flows. Physical Chemistry Chemical Physics, 2019, pp.1-11. ⟨10.1039/c9cp00999j⟩. ⟨hal-02134681⟩