Observance of Multiple Melting and Nematic Phase Transitions in A Next Generation “Quaternary Liquid Crystal System” (QLCS)

Seide M and Sharma D

Published on: 2023-05-31

Abstract

This paper explores the details of a Liquid Crystal (LC) system made by mixing four liquid crystals from the Alkyl Cyanobiphenyl (nCB) family with different molecular weights with different sizes of different sizes CH tails. These four nCB liquid crystals are 4CB, 5CB, 6CB, and 7CB, and they are added in a 3:2:1:3 ratio. We call this liquid crystal system a “Quaternary Liquid Crystal System” (QLCS). After preparing this system, they are used for study using the Differential Scanning Calorimetry (DSC) technique. This QLCS is heated from - 40 °C to 80 °C with a 20 °C/min ramp rate and then cooled from 80 °C to -40 °C in DSC with the same ramp rate. This experimental method brings some unique phase transitional behavior in this QLCS that is not observed in its parent LCs as a single LC. The QLCS shows double melting and double nematic phase transitions in heating and double phase transitions in cooling in nematic. It does not show any crystallization in cooling. This unique result draws our attention toward detailed research and makes this sample significant in the research and science field. This study may bring some significant possibilities for the use of mixed LCs in the Liquid Crystal Display (LCD) world.