Manipulation of the Wettability of Surfaces on the 0.1 to 1 Micrometer Scale Through Micromachining and Molecular Self-Assembly
HARVARD UNIV CAMBRIDGE MA DEPT OF CHEMISTRY
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Micromachining allows the formation of micrometer-sized regions of bare gold on the surface of a gold film supporting a self-assembled monolayer SAM of alkanethiolate. A second SAM forms on the micromachined surfaces on exposing the entire system--the remaining undisturbed gold-supported SAM and the micromachined features of bare gold--to a solution of dialkyldisulfide. By preparing an initial hydrophilic SAM from HS CH2 15COOH, micromachining features into this SAM, and covering these features with a hydrophobic SAM formed from CH3CH211S2, it is possible to construct micrometer-scale hydrophobic lines in a hydrophilic surface. These lines provide new structures with which to manipulate the shapes of liquid drops.
- Inorganic Chemistry