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Title: Strengthening of columnar hexagonal phase of a room temperature discotic liquid crystalline material by using ferroelectric barium titanate nanoparticles
Authors: Uttam, Rahul
Yadav, Neelam
Kumar, Sandeep
Dhar, Ravindra
Keywords: Discotic liquid crystal
Barium titanate nanoparticles
Dielectric relaxation
Small angle XRD
Differential Scanning Calorimetry
Issue Date: 15-Nov-2019
Publisher: Elesvier B.V.
Citation: Journal of Molecular Liquids, 2019, Vol.294, p111609
Abstract: A discotic liquid crystalline (DLC) material possessing a wide room temperature columnar hexagonal phase has been used as a polymeric matrix to disperse ferroelectric barium titanate nanoparticles at the concentrations of 0.5 wt% and 1.0 wt% respectively. The influence of nanoparticles on the discotic liquid crystal has been studied with the help of Differential Scanning Calorimetry, impedance spectroscopy, polarizing optical microscopy and Ultraviolet-Visible spectroscopy. Small angle X-ray scattering (SAXS) measurements have also been performed. Thermal measurements reveal stabilization of the columnar hexagonal phase due to the addition of ferroelectric nanoparticles in the discotic system. Permittivity is decreasing due to the formation of anti-dipolar ordering in the presence of ferroelectric nanoparticles. A relaxation mode is visible in the high kHz to low MHz region. The relaxation frequency has been found to decrease with the incarceration of barium titanate nanoparticles in DLC. A shift in UV–Vis absorption/transmittance spectra indicates modification in the electronic structure and hence physical property of the nanocomposites. SAXS explains the variation of different hexagonal lattice parameters with respect to the temperature.
Description: Restricted Access
ISSN: 0167-7322
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Copyright: 2019 Elsevier B.V.
Appears in Collections:Research Papers (SCM)

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