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Effect of the interaction strength and anisotropy on the diffusio-phoresis of spherical colloids

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Abstract

Gradients in temperature, concentration or electrostatic potential cannot exert forces on a bulk fluid; they can, however, exert forces on a fluid in a microscopic boundary layer surrounding a (nano)colloidal solute, resulting in so-called phoretic flow. Here we present a simulation study of phoretic flow around a spherical colloid held fixed in a concentration gradient. We show that the resulting flow velocity depends non-monotonically on the strength of the colloid–fluid interaction. The reason for this non-monotonic dependence is that solute particles are effectively trapped in a shell around the colloid and cannot contribute to diffusio-phoresis. We also observe that the flow depends sensitively on the anisotropy of solute–colloid interaction.

Graphical abstract: Effect of the interaction strength and anisotropy on the diffusio-phoresis of spherical colloids

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Article information


Submitted
15 Oct 2019
Accepted
14 Feb 2020
First published
17 Feb 2020

Soft Matter, 2020, Advance Article
Article type
Paper

Effect of the interaction strength and anisotropy on the diffusio-phoresis of spherical colloids

J. Wei, S. Ramírez-Hinestrosa, J. Dobnikar and D. Frenkel, Soft Matter, 2020, Advance Article , DOI: 10.1039/C9SM02053E

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