Drying of colloidal droplets on superhydrophobic surfaces.
Recent research on the flow patterns during the drying of droplets of solutions or suspensions has revealed a characteristic flow of dissolved or suspended material to the droplet periphery to produce the 'coffee ring' phenomenon. This effect was used to make ceramic well-plates by spontaneous manufacturing. Here we demonstrate that when a colloidal droplet dries on a superhydrophobic surface, the effect is rather different. Evaporation from the region adjacent to the three phase line becomes so restricted that the interior flows, and hence the final destination of particles, changes and the characteristic bowl-shape becomes inverted.
Chen
Lifeng
L
Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
Evans
Julian R G
JR
D000537:Aluminum Oxide / Q000737:chemistry; D003102:Colloids / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D010316:Particle Size; D012828:Silicones / Q000737:chemistry; D012996:Solutions; D013499:Surface Properties; D014867:Water / Q000737:chemistry
D003102:Colloids; D012828:Silicones; D012996:Solutions; D014867:Water; D003300:Copper; D000537:Aluminum Oxide