COLL 363 |
| Amelia R. Shillingsburg1, Robert J. Waltman2, Jane E. Frommer1, and George W. Tyndall1. (1) IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, (2) IBM Storage and Technology Division, 5600 Cottle Road, San Jose, CA 95193 |
| The wetting of a liquid on a surface proceeds in a manner to minimize the free energy of the system. Competition between two liquids for a surface would involve the additional dynamics of a three-body system. We have studied such a system in a polymer-covered amorphous carbon film upon exposure to water. In our experiments, perfluoropolyethers, configured as 1nm thick films on amorphous carbon surfaces, have been subjected to elevated temperature and humidity conditions. The exposure of this hydrophobic fluorinated surface to an aqueous environment results in formation of microscopic drop-like features whose geometry, as determined by AFM, depends on the chemical structure of the polymer's endgroups. To account for this behavior we attempt to correlate the chemical structures of the various fluoroethers with a kinetic scheme for the competition for active sites on the amorphous carbon substrate. Our investigation takes into account confinement effects and previous dewetting studies. |
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Adsorption of Macromolecules at Liquid-Solid Interfaces
Division of Colloid and Surface Chemistry |