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Elastic and dielectric properties of ferroelectric nanoparticles/bent-core nematic liquid crystal blend

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Abstract.

Bent-core liquid crystals present the first evidence of forming polar superstructures from achiral molecules. The nematic phase is the newest member of the bent-core family and turns out to be extremely interesting owing to its distinct features compared to its calamitic counterpart. Here the investigation of one achiral unsymmetrical 2-methyl-3-amino-benzoic acid (2,6-substituted toluene)-derived four-ring bent-core nematic (BCN) liquid crystals (11-2M-F) is presented after nanodispersion. Ferroelectric nanoparticles significantly affect the phase transition temperature, threshold voltage, dielectric permittivity, elastic constants and splay viscosity of the pristine BCN. In most bent-core nematic liquid crystals the bent elastic constant (K33) is usually lower than the splay elastic constant (K11) owing to the presence of short-range smectic-C-like correlations in the nematic phase. Thus the elastic anisotropy (\( K_{33}-K_{11}\)) is usually negative in bent-core nematics unlike in rod-like nematic liquid crystals where K33 is always greater than K11. Here we report a short-core bent-shaped nematic liquid crystal whose negative elastic anisotropy was turned to positive by minute addition of ferroelectric nanoparticles.

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Authors and Affiliations

  1. Department of Physics, University of Calcutta, 92 Acharya Prafulla Chandra Road, 700 009, Kolkata, India

    Raj Kumar Khan & Sharmistha Ghosh

  2. Chemistry Department, Assam University, 788011, Silchar, India

    Srikanth Turlapati & Nandiraju V. S. Rao

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  1. Raj Kumar Khan
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  2. Srikanth Turlapati
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  3. Nandiraju V. S. Rao
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  4. Sharmistha Ghosh
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Correspondence to Sharmistha Ghosh.

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Khan, R.K., Turlapati, S., Rao, N.V.S. et al. Elastic and dielectric properties of ferroelectric nanoparticles/bent-core nematic liquid crystal blend. Eur. Phys. J. E 40, 75 (2017). https://doi.org/10.1140/epje/i2017-11564-x

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