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Calorimetric study of smectic x* and validation of dynamic memory in ferroelectric binary complexes

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Abstract

Calorimetric studies of ferroelectric liquid crystalline binary mesogens obtained by mixing precursors namely Acid-Dextro Tartaric (ADT) with either benzoic acid-heptyloxy (7BAS) or benzoic acid-octyloxy (8BAE) abbreviated as ADT + 7BAS and ADT + 8BAE, respectively, in predetermined molar ratios to develop 10 binary mesogens. ADT + 8BAE and ADT + 7BAS are treated as X and Y, and 10 proportions of the binary complexes studied are X = 95: Y = 5, X = 90: Y = 10, X = 80: Y = 20, X = 70: Y = 30, X = 60: Y = 40, X = 50: Y = 50, X = 40: Y = 60, X = 30: Y = 70, X = 20: Y = 80 and X = 10:Y = 90, respectively. The objective of this research was to investigate the enhancement in the growth of sm X* phase thermal width as the molar ratio of Y is altered progressively in the binary complexes. In the above binaries, the phases namely cholesteric, smectic (C*, X* and G*) are confirmed by corresponding optical textural studies. Phase diagram is constructed with polarizing optical microscopic study coupled with DSC phase analysis. Dielectric hysteresis with applied field yielded information about dynamic memory in ferroelectric binary complexes. Specific heat across various phase transitions in selected mesogens is presented.

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Acknowledgements

The authors acknowledge Science and Engineering Research Board, (SERB) Department of Science and Technology (DST), Government of India for their financial support (EMR / 2017 / 001075).

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  1. Liquid Crystal Research Laboratory, Bannari Amman Institute of Technology, Sathyamangalam, Tamilnadu, 638 401, India

    Muchenedi Hari Kishor & M. L. N. Madhu Mohan

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Kishor, M.H., Madhu Mohan, M.L.N. Calorimetric study of smectic x* and validation of dynamic memory in ferroelectric binary complexes. J Therm Anal Calorim 147, 3553–3566 (2022). https://doi.org/10.1007/s10973-021-10797-0

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