Dynamics of Evaporative Colloidal Patterning

September 30, 2015

Fig. 2: Periodic bands and uniform films of colloidal deposits on a silicon substrate placed vertically, as a function of the colloidal volume fraction*. [reprinted by permission from AIP]

Drying suspensions often leave behind complex patterns of particulates, as might be seen in the coffee stains on a table. But how does the transition between different types of patterning occur? Can we control patterning by altering the dynamics of evaporation - the type of dissolving liquid, the concentration of particles, or changing their size and shape? Prof. L. Mahadevan and colleagues from SEAS, Colorado School of Mines, and Brown University, explored these questions and describes their findings in the journal Physics of Fluids*.

Read more at: http://phys.org/news/2015-09-drying-induced-deposition.html

*see C.N. Kaplan, N. Wu, S. Mandre, J. Aizenberg, and L. Mahadevan, "Dynamics of evaporative colloidal patterning," Physics of Fluids 27, 092105 (2015); http://dx.doi.org/10.1063/1.4930283