@article {837601,
	title = {Dynamics of evaporative colloidal patterning},
	journal = {Physics of Fluids},
	volume = {27},
	year = {2015},
	note = {This research was supported by the Air Force Office of Scientific Research (AFOSR) under Award No. FA9550-09-1-0669-DOD35CAP, the Harvard-MRSEC DMR-1420570, and the Kavli Institute for Bionano Science and Technology at Harvard University.},
	pages = {092105},
	abstract = {<p>Drying\&nbsp;suspensions\&nbsp;often leave behind complex patterns of particulates, as might be seen in the coffee stains on a table. Here, we consider the\&nbsp;dynamics\&nbsp;of periodic band or uniform solid\&nbsp;film\&nbsp;formation on a vertical plate suspended partially in a drying\&nbsp;colloidal\&nbsp;solution.\&nbsp;Direct observations allow us to visualize the\&nbsp;dynamics\&nbsp;of band and\&nbsp;film\&nbsp;deposition, where both are made of multiple layers of close packed particles. We further see that there is a transition between banding and filming when the\&nbsp;colloidal\&nbsp;concentration is varied. A minimal theory of the\&nbsp;liquid\&nbsp;meniscus\&nbsp;motion along the plate reveals the\&nbsp;dynamics\&nbsp;of the banding and its transition to the filming as a function of the ratio of\&nbsp;deposition\&nbsp;and\&nbsp;evaporation\&nbsp;rates. We also provide a complementary multiphase\&nbsp;model\&nbsp;of\&nbsp;colloids\&nbsp;dissolved in the\&nbsp;liquid,\&nbsp;which couples the inhomogeneous\&nbsp;evaporation\&nbsp;at the evolving\&nbsp;meniscus\&nbsp;to the fluid and particulate flows and the transition from a dilute\&nbsp;suspension\&nbsp;to a porous plug. This allows us to determine the concentration dependence of the bandwidth and the\&nbsp;deposition\&nbsp;rate. Together, our findings allow for the control of drying-induced patterning as a function of the\&nbsp;colloidal\&nbsp;concentration and\&nbsp;evaporationrate.</p>},
	doi = {10.1063/1.4930283},
	url = {http://nrs.harvard.edu/urn-3:HUL.InstRepos:23670482},
	author = {C.N. Kaplan and N. Wu and S. Mandre and Aizenberg, J. and L. Mahadevan}
}
