Steady states of thin film droplets on chemically heterogeneous substrates

Published

Journal Article

Abstract We study steady-state thin films on chemically heterogeneous substrates of finite size, subject to no-flux boundary conditions. Based on the structure of the bifurcation diagram, we classify the 1D steady-state solutions that exist on such substrates into six different branches and develop asymptotic estimates for the steady states on each branch. Using perturbation expansions, we show that leading-order solutions provide good predictions of the steady-state thin films on stepwise-patterned substrates. We show how the analysis in one dimension can be extended to axisymmetric solutions. We also examine the influence of the wettability contrast of the substrate pattern on the linear stability of droplets and the time evolution for dewetting on small domains. Results are also applied to describe 2D droplets on hydrophilic square patches and striped regions used in microfluidic applications.

Full Text

Duke Authors

Cited Authors

  • Liu, W; Witelski, TP

Published Date

  • November 25, 2020

Published In

Volume / Issue

  • 85 / 6

Start / End Page

  • 980 - 1020

Published By

Electronic International Standard Serial Number (EISSN)

  • 1464-3634

International Standard Serial Number (ISSN)

  • 0272-4960

Digital Object Identifier (DOI)

  • 10.1093/imamat/hxaa036

Language

  • en