TGB Phases in the Binary Mixtures of Nematic and Cholesteric Compounds

Nagappa, N. and Mahadeva, J. and Mohyeddine, S. and Yalemaggad, C. V. and Nagami, S. Anitha and Herimath, Uma S. and Revannasiddaiah, D. and Krishnaswamy, M. V. (2009) TGB Phases in the Binary Mixtures of Nematic and Cholesteric Compounds. MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 508. pp. 242-248.

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We report here some interesting optical textures and phase behavior exhibited by the binary mixtures of Cholestryl 5-(4-((4-hexylphenylimino) methyl)-3-hydroxyphenoxy) pentanoate (C74) and n-Butyloxybenzylidene- p-pentylaniline (BBPA). The samples with 1% to 30% of BBPA exhibit smectic and cholesteric phases. The intermediate concentrations ranging from 30% to 70% of BBPA exhibit smectic A, smectic C*, smectic G, smectic F and smectic B phases. The mixtures with higher concentrations from 71% to 99% of BBPA show Blue phase - N* - TGBA - TGBC - TGBC* - UTGBC* - Sm A phases, Sequentially. The phase behavior exhibited by the samples of different concentrations of BBPA has been studied using polarizing microscope and from the DSC recordings.

Item Type: Article
Uncontrolled Keywords: liquid crystals; phase transition; TGB; TGBC*; UTGBC*
Subjects: Physical Sciences > Physics
Divisions: PG Campuses > Manasagangotri, Mysore > Physics
Depositing User: Users 1 not found.
Date Deposited: 03 Apr 2013 07:28
Last Modified: 24 Jun 2013 11:36

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