Diffusiophoretic manipulation of particles in a drop deposited on a hydrogel

François Boulogne, Sangwoo Shin, Julien Dervaux, Laurent Limat, Howard A. Stone

Research output: Contribution to journalArticle

5 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)5122-5129
Number of pages8
JournalSoft matter
Volume13
Issue number30
DOIs
StatePublished - 2017

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics

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