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Thickness dependence of the anchoring strength in dyedoped nematic liquid crystal cell

C. DASCALU1, A. Th. IONESCU2,*

Affiliation

  1. Physics Department, Faculty of Applied Science, University “Politehnica” of Bucharest, 313 Splaiul Independentei, Bucharest, Romania
  2. Faculty of Physics, University of Bucharest, POBox MG-11, Bucharest 077125, Romania

Abstract

Anchoring properties of polymer coated glass surfaces in nematic liquid crystal cells should not depend on the thickness of the cell. Nevertheless, in the case of cells filled with dye-doped nematic liquid crystals the anchoring energy decreases when the cell thickness increases. This experimental fact was explained by considering that adsorption of dye molecules onto the polymer coatings plays the role of defects on the aligning surfaces. A theoretical model, in terms of free energy formalism, was suggested that explains well the experimental results..

Keywords

Nematic liquid crystal, Azo-dye, Unified anchoring strength, Free energy formalism, Surface adsorption.

Submitted at: March 5, 2009
Accepted at: June 28, 2009

Citation

C. DASCALU, A. Th. IONESCU, Thickness dependence of the anchoring strength in dyedoped nematic liquid crystal cell, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 6, pp. 870-874 (2009)