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Microscopic Spreading of Nonreactive Perfluoropolyalkylether Film on Amorphous Carbon Surfaces
Department of Chemical Engineering, Cheju National University, Cheju 690-756, Korea 1Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, Pa 15213, USA
mckim@cheju.cheju.ac.kr
Korean Journal of Chemical Engineering, July 2000, 17(4), 444-448(5), 10.1007/BF02706858
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Abstract
A spreading mechanism of nonfunctional perfluoroopolyalkylether (PFPE) on carbon surfaces is proposed. For the thin thin-film regine, adsorption-desorption is a main driving force for spreading, and the surface diffusion coefficients increase as the film thickness increases. A two-dimensional virial equation is employed to explain the dependency of surface diffusion coefficient on the film thickness. For the thick thin-film regime, the spreading characteristic is determined by the disjoining pressure gradient. We adopt a slip boundary condition to analyze the thick thin-film regime. This modification of the boundary condition reasonably explains the dependence of surface diffusion coefficients of film thickness.
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Fraysse F, Valignant MP, Cazabat AM, Heslot F, Livingson P, J. Colloid Interface Sci., 158, 27 (1993)
Heslot F, Fraysse N, Cazabat AM, Nature, 338, 640 (1989)
Ma X, "Spreading of Perfluoropolyalkylther Films on Amorphous Carbon Surfaces," Ph.D. Thesis, Carnegie Mellon University, PA (1998)
Marchionni G, Cinquina AG, Tampelini E, Pezzin G, Polym. Eng. Sci., 30, 829 (1990)
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Mate M, J. Appl. Phys., 72, 3084 (1992)
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Teletzke GF, Davis HT, Scriven LE, Chem. Eng. Commun., 55, 41 (1987)
Valignant MP, Fraysee N, Cazabat AM, Heslot F, Langmuir, 9, 601 (1993)
