Flow triggered by instabilities at the contact line of a drop containing nanoparticles

TitleFlow triggered by instabilities at the contact line of a drop containing nanoparticles
Publication TypeJournal Article
Year of Publication2011
AuthorsLi H, Fowler N, Struck C, Sivasankar S
Journal TitleSoft Matter
Volume7
Pages5116-5119
Date Published05
Type of ArticleArticle
ISBN Number1744-683X
Accession NumberISI:000290937300006
Keywordscolloidal suspension, evaporating sessile droplet, GEOMETRY, glass-surface, patterns, ring
Abstract

Mass transport in an evaporating colloidal drop is believed to occur via two flow mechanisms: capillary flow due to evaporation and Marangoni flow due to surface tension gradients. We describe a new mechanism for inward mass transport: circulatory fluid flow triggered by a series of pinning-depinning events at the contact line of a drop containing nanoparticles. This flow can be controlled by varying the nanoparticle concentration, and by tuning the solution surface tension.

URL<Go to ISI>://000290937300006
DOI10.1039/c1sm05097d
Alternate JournalSoft Matter