title: Drying of colloidal droplets on superhydrophobic surfaces.
abstract: 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.
authors.affiliation: Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
authors.forename: Lifeng
authors.initials: L
authors.lastname: Chen
authors.forename: Julian R G
authors.initials: JR
authors.lastname: Evans
mesh_terms: 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
chemical_list: D003102:Colloids; D012828:Silicones; D012996:Solutions; D014867:Water; D003300:Copper; D000537:Aluminum Oxide