Abstract
A spreading mechanism of nonfunctional perfluoropolyalkylehter (PFPE) on carbon surfaces is proposed. For the thin thin-film regime, 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 on film thickness.
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Kim, M.C., Jhon, M.S. Microscopic spreading of nonreactive perfluoropolyalkylether film on amorphous carbon surfaces. Korean J. Chem. Eng. 17, 444–448 (2000). https://doi.org/10.1007/BF02706858
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DOI: https://doi.org/10.1007/BF02706858