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Optical studies of a binary liquid crystal mixture exhibiting induced smectic A phase

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Abstract

A binary liquid crystalline mixture of a monotropic polar compound 4-cyanophenyl 4′-n-pentyl benzoate (CPPB) and an enantiotropic non-polar compound 4-n-hexyl phenyl 4-n′-pentyloxy benzoate (ME5O.6) shows the presence of an induced smectic A phase in the region 0.1 ≤ x CPPB ≤ 0.82, where x CPPB is the mole fraction of CPPB. The results of texture study, density study and refractive index measurements of the eutectic mixture along with those of the pure samples are reported in this paper. The density values of the eutectic mixture are found to be much higher than that of the pure samples. The determination of order parameters of the pure samples and eutectic mixture has been carried out. In order to determine the order parameters of the samples, we have used different methods, Vuks’, Neugebauer’s, modified Vuks’ and direct extrapolation method. The results of order parameters obtained from the different approaches are compared and analysed in detail.

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Acknowledgments

One of the authors (Kiranmala Thingujam) acknowledges the financial assistance from NIT Silchar, Assam, India.

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Authors and Affiliations

  1. Department of Physics, National Institute of Technology Agartala, Agartala, Tripura, 799046, India

    Kiranmala Thingujam

  2. Department of Physics, National Institute of Technology Silchar, Silchar, Assam, 788010, India

    Kiranmala Thingujam, Ayon Bhattacharjee & Basana Choudhury

  3. Department of Physics, National Institute of Technology Meghalaya, Shillong, 793003, India

    Ayon Bhattacharjee

  4. Department of Physics, Karimganj College, Karimganj, Assam, India

    S. D. Sarkar

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  1. Kiranmala Thingujam
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  2. Ayon Bhattacharjee
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  4. S. D. Sarkar
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Correspondence to Kiranmala Thingujam.

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Thingujam, K., Bhattacharjee, A., Choudhury, B. et al. Optical studies of a binary liquid crystal mixture exhibiting induced smectic A phase. Appl. Phys. A 122, 737 (2016). https://doi.org/10.1007/s00339-016-0271-9

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  • DOI: https://doi.org/10.1007/s00339-016-0271-9

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