Phase behaviour and birefringence studies of a liquid crystal binary mixture

M Mitra, SS Roy, TP Majumder, SK Roy

    Research output: Contribution to journalArticle

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    Abstract

    The phase diagram of binary system of 4-n-pentyl 4'-cyanobiphenyl (5CB) and 4-pentyl phenyl trans-4 pentyl cyclohexane carboxylate (D55) is presented, which shows the presence of an injected smectic-A phase and a higher order smectic phase (SmG). Refractive indices (n(o),n(e)) and densities for different compositions of this mixture and for one pure compound (D55) are measured. The orientational order parameters <P-2> are determined from the polarizability values (alpha(o),alpha(e)) which are calculated using both Vuks' as well as Neugebauer's internal held models. The experimental order parameter values for the samples having smectic A phase have been compared with McMillan's theory and with Maier-Saupe theory for the nematic cases.
    LanguageEnglish
    Pages363-369
    JournalMolecular Crystals and Liquid Crystals
    Volume301
    Publication statusPublished - 1997

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    binary mixtures
    birefringence
    liquid crystals
    cyclohexane
    carboxylates
    phase diagrams
    refractivity

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    Mitra, M ; Roy, SS ; Majumder, TP ; Roy, SK. / Phase behaviour and birefringence studies of a liquid crystal binary mixture. In: Molecular Crystals and Liquid Crystals. 1997 ; Vol. 301. pp. 363-369.
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    abstract = "The phase diagram of binary system of 4-n-pentyl 4'-cyanobiphenyl (5CB) and 4-pentyl phenyl trans-4 pentyl cyclohexane carboxylate (D55) is presented, which shows the presence of an injected smectic-A phase and a higher order smectic phase (SmG). Refractive indices (n(o),n(e)) and densities for different compositions of this mixture and for one pure compound (D55) are measured. The orientational order parameters <P-2> are determined from the polarizability values (alpha(o),alpha(e)) which are calculated using both Vuks' as well as Neugebauer's internal held models. The experimental order parameter values for the samples having smectic A phase have been compared with McMillan's theory and with Maier-Saupe theory for the nematic cases.",
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    note = "16th International Liquid Crystal Conference, KENT, OH, JUN 24-28, 1996",
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    Mitra, M, Roy, SS, Majumder, TP & Roy, SK 1997, 'Phase behaviour and birefringence studies of a liquid crystal binary mixture', Molecular Crystals and Liquid Crystals, vol. 301, pp. 363-369.

    Phase behaviour and birefringence studies of a liquid crystal binary mixture. / Mitra, M; Roy, SS; Majumder, TP; Roy, SK.

    In: Molecular Crystals and Liquid Crystals, Vol. 301, 1997, p. 363-369.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Phase behaviour and birefringence studies of a liquid crystal binary mixture

    AU - Mitra, M

    AU - Roy, SS

    AU - Majumder, TP

    AU - Roy, SK

    N1 - 16th International Liquid Crystal Conference, KENT, OH, JUN 24-28, 1996

    PY - 1997

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    AB - The phase diagram of binary system of 4-n-pentyl 4'-cyanobiphenyl (5CB) and 4-pentyl phenyl trans-4 pentyl cyclohexane carboxylate (D55) is presented, which shows the presence of an injected smectic-A phase and a higher order smectic phase (SmG). Refractive indices (n(o),n(e)) and densities for different compositions of this mixture and for one pure compound (D55) are measured. The orientational order parameters <P-2> are determined from the polarizability values (alpha(o),alpha(e)) which are calculated using both Vuks' as well as Neugebauer's internal held models. The experimental order parameter values for the samples having smectic A phase have been compared with McMillan's theory and with Maier-Saupe theory for the nematic cases.

    M3 - Article

    VL - 301

    SP - 363

    EP - 369

    JO - Molecular Crystals and Liquid Crystals

    T2 - Molecular Crystals and Liquid Crystals

    JF - Molecular Crystals and Liquid Crystals

    SN - 1542-1406

    ER -