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Article Dans Une Revue Soft Matter Année : 2017

Diffusiophoretic manipulation of particles in a drop deposited on a hydrogel

Résumé

We report an experimental study on the manipulation of colloidal particles in a drop sitting on a hydrogel. The manipulation is achieved by diffusiophoresis, which describes a directed motion of particles induced by solute gradients. By letting the solute concentrations for the drop and the hydrogel be different, we control the motion of particles in a stable suspension, which is otherwise difficult to achieve. We show that diffusiophoresis can cause the particles to move either toward or away from the liquid-air interface depending on the direction of the solute gradient and the surface charge of the particles. We measure the particle adsorption experimentally and rationalize the results with a one-dimensional numerical model. We show that diffusiophoretic motion is significant at the lengthscale of a drop deposited on a hydrogel, which suggests a simple method for the deposition of particles on hydrogels.
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Dates et versions

hal-01629949 , version 1 (20-03-2024)

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François Boulogne, Sangwoo Shin, Julien Dervaux, Laurent Limat, Howard A. Stone. Diffusiophoretic manipulation of particles in a drop deposited on a hydrogel. Soft Matter, 2017, 13 (30), pp.5122 - 5129. ⟨10.1039/C7SM00915A⟩. ⟨hal-01629949⟩
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