Planar nematic anchoring on SiO-coated substrates |
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Authors: | R Barberi M Giocondo G V Sayko |
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Institution: | (1) Unità INFM di Consenza, Dipartimento di Fisica, Università della Calabria, I-87036 Rende (CS), Italy;(2) Istituto di Chimica, Facoltà di Ingegneria, Università di Reggio Calabria, Via Cuzzocrea, I-89100 Reggio Calabria, Italy;(3) Theoretical Department, General Physics Institute, 117942 Moskow, Russia |
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Abstract: | Summary The nematic planar anchoring is usually explained by using simple elastic models: the surface easy axis corresponds to the
surface direction that minimizes the excess of nematic elastic energy. When anisotropic rough substrates are used to align
nematic liquid crystals, due to the complex surface morphology, usual elastic models are not directly applicable. This paper
presents quantitative topographical data of rough substrates, obtained with oblique SiO evaporation under vacuum for nematic
planar anchoring. Experimental data are obtained by means of Atomic Force Microscopy and they are used to demonstrate the
self-affine nature of these substrates and to relate the nematic anchoring with the anisotropy of the local fractal properties
of the substrate itself.
Paper presented at the I International Conference on Scaling Concepts and Complex Fluids, Copanello, Italy, July 4–8, 1994. |
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Keywords: | Liquid crystals |
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