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Langmuir. 2004 Nov 9;20(23):9893-6.

Fast directed motion of "fakir" droplets.

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1
Department of Chemistry and Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA.

Abstract

In this Letter, we report on the motion of water droplets on surfaces decorated with molecular gradients comprising semifluorinated (SF) organosilanes. SF molecular gradients deposited on flat silica substrates facilitate faster motion of water droplets relative to the specimens covered with an analogous hydrocarbon gradient. Further increase in the drop speed is achieved by advancing it along porous substrates coated with the SF wettability gradients. The results of our experiments are in quantitative agreement with a simple scaling theory that describes the faster liquid motion in terms of reduced friction at the liquid/substrate interface.

PMID:
15518468
DOI:
10.1021/la048612a
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