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Fast directed motion of "fakir" droplets.

Authors
  • Petrie, Randall J
  • Bailey, Tiffani
  • Gorman, Christopher B
  • Genzer, Jan
Type
Published Article
Journal
Langmuir : the ACS journal of surfaces and colloids
Publication Date
Nov 09, 2004
Volume
20
Issue
23
Pages
9893–9896
Identifiers
PMID: 15518468
Source
Medline
License
Unknown

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.

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