Pattern formation in spontaneous dewetting of thin apolar films

Khanna, Rajesh ; Sharma, Ashutosh (1997) Pattern formation in spontaneous dewetting of thin apolar films Journal of Colloid and Interface Science, 195 (1). pp. 42-50. ISSN 0021-9797

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Various stages of evolution of surface instability leading to dewetting are investigated for thin (<100 nm) fluid films subjected to the long range van der Waals interactions on a nonwettable solid. The problems of pattern selection and complete three-dimensional morphology are resolved based on numerical solutions of the nonlinear two-dimensional thin film equation. The initial small scale random nonhomogeneities are quickly reorganized into a large scale coherent bicontinuous structure consisting of "hills" and "valleys," which is reminiscent of the classical picture of the spinodal decomposition in the linear approximation. On the level of a "unit-cell," the bicontinuous structure slowly evolves into an increasingly axisymmetric circular pattern, and eventually a growing circular hole (dry spot) is formed. Scaling arguments, as well as the simulations give the characteristic mean area of a unit-cell containing a single hole to be proportional to (h04γ/|S|), where h0 is mean thickness, γ is surface tension, andSis the spreading coefficient.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Thin Films; Nonlinear Stability of; Pattern Formation in Thin Films; Dewetting
ID Code:46900
Deposited On:06 Jul 2011 10:49
Last Modified:06 Jul 2011 10:49

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