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Planar nematic anchoring on SiO-coated substrates

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Il Nuovo Cimento D

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.

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Authors and Affiliations

  1. Unità INFM di Consenza, Dipartimento di Fisica, Università della Calabria, I-87036, Rende (CS), Italy

    R. Barberi, M. Giocondo & G. V. Sayko

  2. Istituto di Chimica, Facoltà di Ingegneria, Università di Reggio Calabria, Via Cuzzocrea, I-89100, Reggio Calabria, Italy

    R. Barberi

  3. Theoretical Department, General Physics Institute, 117942, Moskow, Russia

    G. V. Sayko

Authors
  1. R. Barberi
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  2. M. Giocondo
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  3. G. V. Sayko
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Barberi, R., Giocondo, M. & Sayko, G.V. Planar nematic anchoring on SiO-coated substrates. Il Nuovo Cimento D 16, 895–900 (1994). https://doi.org/10.1007/BF02456740

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  • DOI: https://doi.org/10.1007/BF02456740

PACS 61.30

PACS 68.10.Et

PACS 68.90

PACS 01.30.Cc

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