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Title: Gold nanoparticles in plastic columnar discotic liquid crystalline material
Authors: Mishra, Mukesh
Kumar, Sandeep
Dhar, Ravindra
Keywords: Thermodynamical parameters
Band gap and refractive Index
Issue Date: 10-May-2016
Publisher: Elsevier B.V
Citation: Thermochimica Acta, 2016, Vol. 631, p 59-70
Abstract: We have studied the effect of gold nanoparticles (GNPs) on the thermodynamical, optical and dielectrical parameters of a discotic liquid crystal (DLC) namely hexabutyloxytriphenylene (HAT4). It has been observed that with the increase of GNPs concentration in DLC, composites shows two different regions. In the first regions i.e. low concentrations (<1 wt%), columnar hexagonal-isotropic (Colhp-IL) transition temperature and enthalpy (ΔH) decrease rapidly while in the second region i.e. higher concentrations (>1 wt%) Colhp-IL transition temperature and ΔH are approximately constant. It has been observed that, in the case of composites having 0.2 and 0.6 wt% of GNPs, conductivity has enhanced but it is poor as compared to the composite having 1.2 wt% of GNPs. For 1.2 wt% of GNPs, conductivity has increased by seven orders of magnitude as compared to the DLC. Optical study suggests that band gap of nanocomposites has decreased due to dispersion of GNPs.
Description: Restricted Access.
ISSN: 00406031
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Copyright: 2016 Elsevier B.V.
Appears in Collections:Research Papers (SCM)

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