Surface transitions in nematic liquid crystals oriented with Langmuir-Blodgett films |
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| Authors: | A. L. Alexe-Ionescu G. Barbero A. Ignatov E. Miraldi |
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| Affiliation: | (1) Physics Department, Polytechnical Institute of Bucharest, Splaiul Independentei 313, R-77216 Bucharest, Romania;(2) Dipartimento di Fisica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 1-10129 Torino, Italy;(3) Laboratoire de Physique des Solides, Université de Paris-Sud, Bât. 510, F-91405 Orsay, France;(4) General Physics Institute of the Academy of Sciences, Vavilova St.38, 117942 Moscow, Russia |
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| Abstract: | In this paper two types of surface transitions in nematic liquid crystals are theoretically analyzed with a simple model in which the anchoring energy is the result of both steric and electric interactions. The physical model is proper to explain both the transition temperature experimentally observed in homeotropically aligned nematic liquid crystals, and the change in the mean molecular direction due to the variation of the number of surfactant films, piled on the boundary surfaces with the Langmuir-Blodgett technique.Partially supported by the TEMPUS program |
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| Keywords: | 61.30.– v 61.30.Gd 64.70.Md |
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