COLL 350 |
| C. Mathew Mate, Hitachi San Jose Research Center, 650 Harry Rd., San Jose, CA 95120 |
| We have all noticed the intricate wave patterns that wind generates on liquid surfaces. On these macroscopic surfaces, the driving force for wave formation is wind shear, while gravity, surface tension, and viscosity work to smooth the surfaces. Here, I show how wind shear can generate and manipulate wave patterns on the surfaces of molecularly thin liquid films of perfluoropolyether lubricants. These films are susceptible to dewetting, indicating repulsive intermolecular forces help promote wind-induced-roughening. The wave patterns are pinned to the substrate surface, indicating a heterogenous interface interaction. These results hightlight the role of chemical heterogeneity in nucleating dewetting phenomena and in the no-slip boundary condition at liquid-solid interfaces. |
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Friction, Lubrication, and Adhesion in Micro- and Nano-Scale Devices
2:00 PM-5:10 PM, Tuesday, March 30, 2004 Marriott -- Orange County 5, Oral
Division of Colloid and Surface Chemistry |