skip to main content

SciTech ConnectSciTech Connect

Title: A charge transfer complex nematic liquid crystalline gel with high electrical conductivity

We describe the rheological, dielectric and elastic properties of a nematic liquid crystal gel created using an anthrylidene derivative of arjunolic acid, a chiral triterpenoid, obtained from the extracts of the wood of Terminalia arjuna. In this novel gel, having the electron-donor and acceptor components as minority constituents, the gelation and strengthening of charge-transfer complex (CTC) formation are seen to be occurring concomitantly. In addition to being mechanically strong with a large storage modulus, the gel with the maximized CTC exhibits Frank bend elastic constant values that approach nanonewton levels. The highlight of the study is the observation of 4–5 orders of magnitude increase in electrical conductivity for this gel, a value that is higher than even in the CT complexes of 2-d ordered columnar structures. A further important advantage of the present system over the columnar complex is that the high conductivity is seen for ac probing also, and owing to the nematic nature can be switched between its anisotropic limits. Some of these features are ascribed to a specific molecular packing architecture, which reduces the trapping of the charge carriers.
Authors:
; ;  [1] ; ;  [2]
  1. Centre for Nano and Soft Matter Sciences, Jalahalli, Bangalore 560013 (India)
  2. Department of Chemistry and Chemical Technology, Vidyasagar University, Midnapore (W) 721 102 (India)
Publication Date:
OSTI Identifier:
22305851
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; BINDING ENERGY; CHARGE CARRIERS; CHARGE TRANSPORT; CHIRALITY; DIELECTRIC MATERIALS; ELASTICITY; ELECTRIC CONDUCTIVITY; LIQUID CRYSTALS; SWITCHES; TRAPPING; VALENCE