Diffusiophoresis in a near-critical binary fluid mixture

We consider placing a rigid spherical particle into a binary fluid mixture in the homogeneous phase near the demixing critical point. The particle surface is assumed to have a short-range interaction with each mixture component and to attract one component more than the other. Owing to large osmotic...

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Bibliographic Details
Published in:Physics of fluids (1994) 2022-04, Vol.34 (4)
Main Author: Fujitani, Youhei
Format: Article
Language:English
Subjects:
Binary fluids
Critical point
Fluid dynamics
Mixtures
Particle motion
Physics
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Summary:We consider placing a rigid spherical particle into a binary fluid mixture in the homogeneous phase near the demixing critical point. The particle surface is assumed to have a short-range interaction with each mixture component and to attract one component more than the other. Owing to large osmotic susceptibility, the adsorption layer, where the preferred component is more concentrated, can be of significant thickness. This causes a particle motion under an imposed composition gradient. Thus, diffusiophoresis emerges from a mechanism which has not been considered so far. We calculate how the mobility depends on the temperature and particle size.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0082991