Home | My Profile | Contact Us
Research Trends Products  |   order gateway  |   author gateway  |   editor gateway  
Register | Forgot Password

Author Resources
 Author Gateway
 Article submission guidelines

Editor Resources
 Editor/Referee Gateway

 Regional Subscription Agents/Distributors
Trends in Physical Chemistry   Volumes    Volume 16 
Effect of cooling on order parameter of phase transitions of 8CB applying JMA and MS models
Dipti Sharma, Kimberly Farah, John C. MacDonald, Ashok Kumar
Pages: 63 - 69
Number of pages: 7
Trends in Physical Chemistry
Volume 16 

Copyright © 2016 Research Trends. All rights reserved

This study explores the effect of cooling rates on order parameter of phase transitions of octylcyanobiphenyl (8CB) liquid crystal applying Johnson-Mehl-Avrami (JMA) and Matusita & Sakka (MS) models. The sample of 8CB was first heated and then cooled with various cooling rates from 5 K/min to 20 K/min to see the effect of cooling rate on phase transitions of 8CB. The 8CB liquid crystal shows three phase transitions namely isotropic to nematic (I-N), nematic to smectic A (N-SmA) and smectic A to crystalline (SmA-K) on cooling at 312.2 K, 305.3 K and 267 K, respectively. The appearance of transition peaks follows the transition behavior discussed and given by JMA theory and Ozawa model. JMA theory was then used to find the activation energy of each transition on cooling. Further, the MS model was used to find the order parameter (n) of each transition of 8CB on cooling when molecules of 8CB tends to move from completely disordered state to completely ordered state from isotropic phase to crystalline phase. The order parameter (n) of all phase transitions was found in the range of 0.30 to 0.82 for I-N to SmA-K phase transition and the activation energy (ΔEc) of the transitions was found in the range of 0.30 to 60 kJ/mol. The effect of cooling rates brings significant effect on order parameter “n” and activation energy “ΔEc” of phase transitions of 8CB, which shows the importance of phase transitions of 8CB liquid crystal applying JMA and MS models.
Buy this Article


Buy this article
Buy this volume
Subscribe to this title
Shopping Cart

Quick Links
Search Products
Browse in Alphabetical Order : Journals
Browse by Subject Classification : Journals

Ordering Information Ordering Information
Downloadable forms Downloadable Forms