Instability patterns in ultrathin nematic films: comparison between theory and experiment

Details Instability patterns in ultrathin nematic films: comparison between theory and experiment Instability patterns in ultrathin nematic films: comparison between theory and experiment

2010-10-05

arxiv.org/abs/1010.0832v1

Eur. Phys. Lett. 92, 16005 (2010)

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 3 figures, LaTeX macros EPL draft, accepted for publication in EPL

Scientific paper

10.1209/0295-5075/92/16005

Motivated by recent experimental observations [U. Delabre et al, Langmuir 24, 3998, 2008] we reconsider an instability of ultrathin nematic films, spread on liquid substrates. Within a continuum elastic theory of liquid crystals, in the harmonic approximation, we find an analytical expressions for the critical thickness as well as for the critical wavenumber, characterizing the onset of instability towards the stripe phase. Comparing theoretical predictions with experimental observations, we establish the utility of surface-like term such as an azimuthal anchoring.

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