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Science 22 October 1993:
Vol. 262. no. 5133, pp. 547 - 550
DOI: 10.1126/science.8211182
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Articles

Science, Vol 262, Issue 5133, 547-550
Copyright © 1993 by American Association for the Advancement of Science

articles

Long-range attractive force between hydrophobic surfaces observed by atomic force microscopy

YH Tsao, DF Evans, and H Wennerstrom

Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis 55455.

There is evidence from atomic force microscopy for a long-range attractive force between hydrophobic surfaces that is virtually identical to that observed with the surface forces apparatus. This force is present in the nonaqueous solvent ethylene glycol. A possible molecular mechanism involves in-plane polarized domains of solid-like monolayers adsorbed on mica, and a theoretical model has been developed that accounts for many of the observations.


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