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Issue 21, 2016
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Origins of concentration gradients for diffusiophoresis

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Abstract

Fluid transport that is driven by gradients of pressure, gravity, or electro-magnetic potential is well-known and studied in many fields. A subtler type of transport, called diffusiophoresis, occurs in a gradient of chemical concentration, either electrolyte or non-electrolyte. Diffusiophoresis works by driving a slip velocity at the fluid–solid interface. Although the mechanism is well-known, the diffusiophoresis mechanism is often considered to be an esoteric laboratory phenomenon. However, in this article we show that concentration gradients can develop in a surprisingly wide variety of physical phenomena – imposed gradients, asymmetric reactions, dissolution, crystallization, evaporation, mixing, sedimentation, and others – so that diffusiophoresis is in fact a very common transport mechanism, in both natural and artificial systems. We anticipate that in georeservoir extractions, physiological systems, drying operations, laboratory and industrial separations, crystallization operations, membrane processes, and many other situations, diffusiophoresis is already occurring – often without being recognized – and that opportunities exist for designing this transport to great advantage.

Graphical abstract: Origins of concentration gradients for diffusiophoresis

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Article information


Submitted
08 Jan 2016
Accepted
21 Apr 2016
First published
13 May 2016

Soft Matter, 2016,12, 4686-4703
Article type
Emerging Area

Origins of concentration gradients for diffusiophoresis

D. Velegol, A. Garg, R. Guha, A. Kar and M. Kumar, Soft Matter, 2016, 12, 4686
DOI: 10.1039/C6SM00052E

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