What is it about?

It addresses an explicit role of the solvent-colloid interaction on the diffusivity and viscosity of colloidal hard-sphere suspensions as a function of colloidal volume fraction up to about 0.60. The statistical mechanical free volume effect is exploited to obtain an analytical expression on the diffusion coefficient and viscosity, respectively, which accounts for the experiment in a good accuracy.

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Why is it important?

The size ratio of particle and solvent of a colloidal suspension ranges up to ~1000. Nevertheless, the dynamics of colloidal particles is not completely independent of that of the solvent molecules due to the solvent-colloid interaction. Such tremendous size and timescale disparities, however, render it difficult to develop a tractable microscopic theory approach to studying the solvent-particle coupling effect on the transport properties such as diffusivity and viscosity. This problem is addressed, indeed, in a reliable accuracy.


I believe that it puts forward a systematic connection between the hydrodynamic interaction and the transport behaviors via the statistical mechanical approach, thanks to the statistical mechanical definition of the free or excluded volume over the entire density range based on the generic van der Waals equation of state.

Kyunil Rah
LG Energy Solution

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This page is a summary of: Coupling effect of solvent–colloid interaction on diffusivity and viscosity of colloidal hard-sphere suspensions: Statistical mechanical free-volume approach, Physics of Fluids, August 2023, American Institute of Physics, DOI: 10.1063/5.0163613.
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