WIAS Preprint No. 993, (2004)

New slip regimes and the shape of dewetting thin liquid films



Authors

  • Konrad, Renate
  • Jacobs, Karin
  • Münch, Andreas
  • Wagner, Barbara
  • Witelski, Thomas

2010 Mathematics Subject Classification

  • 76A55 76E17 76E17

2008 Physics and Astronomy Classification Scheme

  • 68.15.+e, 47.20.Ma, 47.54.+r, 68.37.Ps

Keywords

  • slippage, lubrication approximation, interfacial instability

Abstract

We compare the dewetting behavior of liquid polymer films on silicon/silicon oxide wafers that have been coated with either Octadecyltrichlorosilane (OTS) or Dodecyltrichlorosilane (DTS). Our experiments show that the dewetting rates for DTS are significantly larger than for OTS. We also compare the profile of the rim that forms as the film dewets and find that it develops a spatially decaying oscillatory structure on the side facing the undisturbed film if an OTS coated wafer is used, but is monotonically decaying for DTS. We argue that for this situation only the friction coefficient can be different, suggesting that slippage plays a role in this transition. For the first time, we show here that this transition is in fact captured by a lubrication model that can be derived from the Navier-Stokes equations with a Navier-slip boundary condition at the liquid/solid interface, and accounts for large slip lengths.

Appeared in

  • Phys.Rev. Lett., 95 (2005), pp. 127801/1--127801/4.

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