Effects of dispersion forces in the instability of polymer films |
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Authors: | Zhao He-Ping Tsui Ophelia K C and Liu Zheng-You |
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Institution: | Department of Physics, Wuhan University, Wuhan 430072, China; Department of Physics, Jishou University, Jishou 416000, China; Department of Physics, Hong Kong University of Science and Technology, Hong Kong, China |
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Abstract: | Spontaneous rupture of some polymer films upon heating is
commonplace. The very criterion for this instability is the system free
energy possessing a negative curvature. Within the framework of full
frequency-dependent theory of dispersion forces, we have derived the excess
free energy of a typical system---polystyrene film deposited on the silicon
substrate. The excess free energy, wavelengths and growth rates are
calculate and a comparison is made between the accurate results and the
approximate results. It is found that the stability of the film can be tuned
by the variation of the thickness of the coating and the retardation effects
can be significant sometimes. |
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Keywords: | liquid thin film interfacial instability excess free
energy |
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