WIAS Preprint No. 1887, (2013)

Propagating topological transformations in thin immiscible bilayer films



Authors

  • Hennessy, Mathew G.
  • Burlakov, Victor M.
  • Münch, Andreas
  • Wagner, Barbara
  • Goriely, Alain

2010 Mathematics Subject Classification

  • 76M45 76E17 35B40 35C20

2008 Physics and Astronomy Classification Scheme

  • 64.60.an

Keywords

  • phase separation and segregation in thin films, metastable phases, liquid-liquid interface structure

Abstract

A physical mechanism for the topological transformation of a two-layer system confined by two substrates is proposed. Initially the two horizontal layers, A and B, are on top of each other, but upon a sufficiently large disturbance, they can rearrange themselves through a spontaneously propagating sectioning to create a sequence of vertical alternating domains ABABAB. This generic topological transformation could be used to control the morphology of fabricated nanocomposites by first creating metastable layered structures and then triggering their transformation. The generality is underscored by formulating conditions for this topological transformation in terms of the interface energies between phases and substrates. The theoretical estimate for the width of the domains is confirmed by simulations of a phase-field model and its thin-film/sharp-interface approximation.

Appeared in

  • Europhysics Letters, 105 (2014) pp. 66001/1--66001/6.

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