Optical Rotation and Transmittance of Different Phases of Ferroelectric Liquid Crystal Sample ZLI 3654

Syed Salman Ahmad Warsi; Rajiv Manohar

doi:10.17485/IJST/v15i21.419

Article

Optical Rotation and Transmittance of Different Phases of Ferroelectric Liquid Crystal Sample ZLI 3654

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Indian Journal of Science and Technology

DOI: 10.17485/IJST/v15i21.419

Year: 2022, Volume: 15, Issue: 21, Pages: 1052-1058

Original Article

Optical Rotation and Transmittance of Different Phases of Ferroelectric Liquid Crystal Sample ZLI 3654

Syed Salman Ahmad Warsi^1,*, Rajiv Manohar²

¹ Department of Physics, Integral University, Lucknow, U.P - 226026, India
² Liquid Crystal Research Lab, Physics Department, University of Lucknow, U. P. - 226007, India

*Corresponding author email: [email protected]

Received Date:23 February 2022, Accepted Date:30 April 2022, Published Date:21 June 2022

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

Objectives: The Phase transition scheme of Ferroelectric Liquid Crystal (FLC) sample has been studied in a temperature range 50⁰C to 95⁰C. Methods: The material was procured from Merck, Germany and was used as such without any further purification, and studied for the measurement of optical rotation and transmittance. The Polarizing Optical Microscopy (POM) technique has been used and the different phases existing in the sample were observed by placing the sample having planar alignment under crossed polarizer arrangement. Findings: The sharp variation in the values of optical rotation and transmittance at the phase transition points clearly indicates that the different phases exist in the experimental sample. From the LDR vs Temperature and Optical Rotation vs Temperature study, four different phases for the sample were obtained. The SmC* phase exists in the temperature range 30⁰C – 62⁰C and at 62⁰C, the SmA* occurs. The sample shows SmA* phase in the temperature range 62⁰C – 76⁰C and at 76⁰C sample transit to Nematic phase which occurs in the temperature range 76⁰C – 86⁰C and lastly, Isotropic phase appears at 86⁰C. Novelty: Some researchers have studied the same sample but in the temperature range 30⁰C to 62⁰C where they were able to observe only two initial phases namely SmC* and SmA* whereas the present study reports the four different phases (SmC*, SmA*, nematic and isotropic) of the Ferroelectric Liquid Crystal (FLC). The same study can also be carried out using the other technique like Differential Scanning Calorimetry (DSC) but the technique used in the present study is simpler and cost-effective. The same technique can also be applied to other liquid crystal samples to study their phase transition behaviour.

Keywords: Ferroelectric Liquid Crystal, Optical Rotation, Optical Transmittance, Polarizing Microscope, Phase Transition

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Copyright

© 2022 Warsi & Manohar. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Published By Indian Society for Education and Environment (iSee)