Please use this identifier to cite or link to this item:
|Enhanced stability of the columnar matrix in a discotic liquid crystal by insertion of ZnO nanoparticles
liquid crystal–nanoparticle composites
|Taylor & Francis
|Liquid Crystals, 2013, Vol.40, p 228-236
|An experimental characterisation of dispersions of ZnO nanoparticles (NPs) in the columnar matrix of a discotic liquid crystal has been carried out. Thermophysical properties have been investigated by absorbance spectroscopy, differential scanning calorimetry, polarising optical microscopy, dielectric measurements, dc conductivity, X-ray diffraction and infrared (IR) dichroism technique. The experimental results show that inclusion of ZnO NPs into the columnar matrix enhances the orientational order in the columnar phase and does not affect the two-dimensional hexagonal lattice. The alignment in homeotropic samples is also found to be better with the addition of the NPs. The real (ϵ′) and imaginary parts (ϵ′′) of the permittivity increase by a small amount in the dispersions. The order parameter measured using the IR dichroism technique in the face-on geometry (homeotropic alignment) shows an enhancement for the composite system. The dc conductivity is also found to increase by an order of magnitude by addition of the NPs. These results suggest an improved stacking of the disc-like molecules within the columns by the insertion of the ZnO NPs possessing high charge mobility. Such composite systems would be highly beneficial for potential applications such as organic conductors.
|2013 Taylor & Francis
|Appears in Collections:
|Research Papers (SCM)
Files in This Item:
|View/Open Request a copy
Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.