期刊
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
卷 41, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colcom.2021.100368
关键词
Double-diffusive convection; Colloidal fingering; Salt fingering; Bio-convection in biofilms
资金
- Department of Science and Technology (DST) , Government of India, through a special IRHPA grant
- IIT Bombay and Industrial Research and Consultancy Centre (IRCC)
When a liquid is forced through a second liquid with different density or viscosity, the interface can become unstable, resulting in finger-like patterns. Specifically, colloidal fingers form when a colloidal suspension is placed above a miscible liquid of higher mass density.
When a liquid is forced through a second liquid with a differing density or viscosity, the interface can become unstable resulting in finger-like patterns that grow and bifurcate. A similar in appearance, though of a different origin, salt fingers develop when a warm salty solution is placed above colder fresh water of a higher mass density. Here, we report the discovery of colloidal fingers that form spontaneously when a colloidal suspension is placed above a miscible liquid of higher mass density in an isothermal situation. Eliminating other possibilities, we argue that the instability is due to double mass-diffusive convection resulting from the large difference between the mass diffusivity of the miscible liquids and the colloidal-mass diffusivity in the mixed medium. The principle is general and this kind of fingering should be observable in a variety of colloidal systems and biofilms, including where it can rise upwards.
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