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

  • Raj Kumar Khan
  • Srikanth Turlapati
  • Nandiraju V. S. Rao
  • Sharmistha Ghosh
Regular Article

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.

Graphical abstract

Keywords

Soft Matter: Liquid crystals 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Raj Kumar Khan
    • 1
  • Srikanth Turlapati
    • 2
  • Nandiraju V. S. Rao
    • 2
  • Sharmistha Ghosh
    • 1
  1. 1.Department of PhysicsUniversity of CalcuttaKolkataIndia
  2. 2.Chemistry DepartmentAssam UniversitySilcharIndia

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