Surface free energies for nematic shells

Details Surface free energies for nematic shells Surface free energies for nematic shells

2011-12-03

arxiv.org/abs/1112.0641v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

We propose a continuum model to describe the molecular alignment in thin nematic shells. By contrast with previous accounts, the two-dimensional free energy, aimed at describing the physics of thin films of nematics deposited on curved substrates, is not postulated but it is deduced from the conventional three-dimensional theories of nematic liquid crystals. Both the director and the order-tensor theories are taken into account. The so-obtained surface energies exhibit extra terms compared to earlier models. These terms reflect the coupling of the geometry of the shell with the nematic order parameters. As expected, the shape of the shell plays a key role in the equilibrium configurations of nematics coating it.

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