Origins of concentration gradients for diffusiophoresis

Darrell Velegol, Astha Garg, Rajarshi Guha, Abhishek Kar, Manish Kumar

Research output: Contribution to journalArticlepeer-review

225 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)4686-4703
Number of pages18
JournalSoft matter
Issue number21
StatePublished - 2016

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Condensed Matter Physics


Dive into the research topics of 'Origins of concentration gradients for diffusiophoresis'. Together they form a unique fingerprint.

Cite this