|Table of Contents|

Biaxial Nematic Liquid Crystal Phase Transition of V-Shaped Molecules Connected by Flexible Chain(PDF)

《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:
2010年02期
Page:
31-37
Research Field:
物理学
Publishing date:

Info

Title:
Biaxial Nematic Liquid Crystal Phase Transition of V-Shaped Molecules Connected by Flexible Chain
Author(s):
Zhai Xueya; Liu Hong
School of Physics and Technology,Nanjing Normal University,Nanjing 210097,China
Keywords:
b iax ia l nem a tics;  phase transition;  bent co re liqu id cry sta l
PACS:
O753.2
DOI:
-
Abstract:
The phase transitions in V-shaped m o lecular system where the tw om o lecu lar arm s a re connected by a flex ible chain are stud ied. Based on a sim ple interaction energy be tw een mo lecu les and the approx ima tion o fm ean- fie ld theory, o rder param ete rs of equ ilibrium state as functions of reduced temperature, and phase diagram s in the p lane o fm o lecu lar structure and temperature are obta ined. The resu lts show tha t the phase transition temperatures are re lated to the elastic streng th o f flex ible cha in k and ratio of tw o arm s length r. When |k|>, or k< but |k|>, as the tem pera ture decreases, system undergoes a first orde r transition from iso trop ic phase to un iax ia l phase. W henk<, r< and |k|>, system has a first order phase trans ition from iso trop ic to uniax ia l phase, then a second o rder phase transition from un iax ial to biax ia l phase. When |k|> continues to inc rease, the first o rderw ill change into aw eak first order or a con tinuous trans ition. When |k|> and|k|> r= 1, system has a first o rder phase transition from iso trop ic to b iax ia l phase. A s | k | inc reases, the first order changes into a second orde r phase transition.

References:

[ 1] Yu L J, Saupe A. Observ ation o f a biax ia l nem atic phase in po tass ium Laurate-1-Decano-lW a ter m ixtures[ J] . Phys Rev Lett, 1980, 45( 12): 1 000-1 003.
[ 2] DeM a tte is G, V irg a E G. T ricr itical po ints in b iax ia l liquid crysta l phases[ J]. Phys Rev E, 2005, 71: 061703 1-8.
[ 3] M adsen L A, D ing em ans T J, N akataM, et a .l Therm otropic biax ia l nema tic liqu id crysta ls[ J] . Phys Rev Le tt, 2004, 92 ( 14): 145505 1-4.
[ 4] NeupaneK, Kang SW, Sharm a S, et a.l Dynam ic light scatter ing study o f biax ia l orde ring in a erm otropic liqu id c rysta l[ J]. Phys Rev Lett, 2006, 97: 207802 1-4.
[ 5] BatesM A, Luckhurst G R. B iax ial nem a tic phases and V- shaped m o lecules: aM onte Car lo sim ulation study[ J] . Phys Rev E, 2005, 72: 051702 1-15.

Memo

Memo:
-
Last Update: 2013-04-08