Diffusiophoretic manipulation of particles in a drop deposited on a hydrogel (bibtex)
by , , , ,
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.
Reference:
F. Boulogne, S. Shin, J. Dervaux, L. Limat, H. A. Stone, "Diffusiophoretic manipulation of particles in a drop deposited on a hydrogel", Soft Matter, vol. 13, 2017, pp. 5122-5129.
Bibtex Entry:
@Article{Boulogne2017c,
  author   = {Boulogne, F. and Shin, S. and Dervaux, J. and Limat, L. and Stone, H. A.},
  title    = {Diffusiophoretic manipulation of particles in a drop deposited on a hydrogel},
  journal  = {Soft Matter},
  year     = {2017},
  volume   = {13},
  issue    = {30},
  pages    = {5122-5129},
  doi      = {10.1039/C7SM00915A},
  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.},
  arxiv    = {1706.06307},
  hal = {01629949},
  keywords = {absorption},
}
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