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Abstract
The effect of Ultra Violet (UV) irradiation on the high temperature chiral nematic (N*) mesophase has been investigated. The controlled UV exposure produced bending in rod shape molecules. The bending of molecules affects their long molecular axis; therefore, the relaxation mode associated with the rotation of molecules along the long molecular axis shifts toward the higher frequency. The UV irradiation also increases the cholesteric plane spacing of N*LC molecules. The a.c. conductivity of N*LC has been increased enormously after UV irradiation. The efficiency of opto-dielectric effect has also been evaluated with the variation of bias voltage in the present investigation.
Acknowledgments
The authors are thankful to Department of Science and Technology, Government of India for the financial assistance for present work in the form of project. The authors DPS and SKG are thankful to CSIR, India For the grant of SRF fellowship Nos. 09/107(0363)/2012-EMR-I and 09/107(0337)/2010-EMR-I respectively. DPS is also thankful to CEFIPRA for Raman-Charpak fellowship in France. TV is thankful to UGC for BSR fellowship. RM is thankful to UGC for research award.