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The Molecular Spreading of Nonpolar Perfluoropolyether Films on Amorphous Carbon Surfaces

โœ Scribed by Min C. Kim; David M. Phillips; Xiaoding Ma; Myung S. Jhon

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
94 KB
Volume
228
Category
Article
ISSN
0021-9797

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โœฆ Synopsis

The spreading mechanism of nonpolar perfluoropolyether films on carbon surfaces is examined in the mesoscopic regime, including both submonolayer and multilayer films. For the submonolayer film, adsorption-desorption is a main mechanism for spreading, and the surface diffusion coefficients increase as the film thickness increases. The driving force for the spreading in the submonolayer regime is the gradient of the disjoining pressure, which is described by the two-dimensional virial equation. For the multilayer film regime, the spreading characteristics are determined by the molecular weight and the disjoining pressure gradient, which is assumed to be purely van der Waals in nature. We adopt a partial slip boundary condition to analyze the multilayer film, which qualitatively explains the dependence of the surface diffusion coefficient on film thickness.

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Experimental techniques used to measure structural parameters of thin films such as thickness, density, and coverage provide important insights into the physical properties of these films. Structural parameters are also often used to predict the eventual performance of thin films. In this study, we