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Diffusiophoretic manipulation of particles in a drop deposited on a hydrogel

Author(s): Boulogne, F; Shin, S; Dervaux, J; Limat, L; Stone, Howard A

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Abstract: 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.
Publication Date: 2017
Citation: Boulogne, F, Shin, S, Dervaux, J, Limat, L, Stone, HA. (2017). Diffusiophoretic manipulation of particles in a drop deposited on a hydrogel. Soft Matter, 13 (5122 - 5129. doi:10.1039/c7sm00915a
DOI: doi:10.1039/c7sm00915a
Pages: 5122 - 5129
Type of Material: Journal Article
Journal/Proceeding Title: Soft Matter
Version: Author's manuscript

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