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Diffusiophoretic manipulation of particles in a drop deposited on a hydrogel

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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.

Graphical abstract: Diffusiophoretic manipulation of particles in a drop deposited on a hydrogel

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Publication details

The article was received on 07 May 2017, accepted on 20 Jun 2017 and first published on 20 Jun 2017


Article type: Paper
DOI: 10.1039/C7SM00915A
Citation: Soft Matter, 2017, Advance Article
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    Diffusiophoretic manipulation of particles in a drop deposited on a hydrogel

    F. Boulogne, S. Shin, J. Dervaux, L. Limat and H. A. Stone, Soft Matter, 2017, Advance Article , DOI: 10.1039/C7SM00915A

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