1H Nuclear Magnetic Resonance Study of an Incommensurate-Commensurate Phase Transition in a Dimesogenic Liquid Crystal

被引：0
|
作者：
Kim, Kyung Oh [1 ]
Choi, Dong Min [1 ]
Lee, Cheol Eui [1 ]
Jin, Jung-Il [2 ]
机构：
[1] Korea Univ, Dept Phys, Seoul 02841, South Korea
[2] Korea Univ, Dept Chem, Seoul 02841, South Korea
来源：
JOURNAL OF THE KOREAN PHYSICAL SOCIETY | 2018年 / 72卷 / 07期
基金：
新加坡国家研究基金会;
关键词：
Dimesogenic liquid crystal; H-1 nuclear magnetic resonance; Commensurate-incommensurate phase transition; RELAXATION; KH2PO4;
D O I：
10.3938/jkps.72.838
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
H-1 nuclear magnetic resonance (NMR) was employed in order to probe an incommensuratecommensurate phase transition in a dimesogenic liquid crystal, N-[4-(6-cholesteryloxycarbonyl) pentyloxy]-4-n-butylazobenzene (KI5A). The recrystallization and the isotropic phase transitions exhibited a discontinuous first-order nature in the H-1 NMR spin-lattice (T (1)) and in the spin-spin relaxation time (T (2E) ) measurements, and an incommensurate smectic A (S (Ainc)) to commensurate helical smectic C (S* (C) ) liquid crystalline phase transition was marked by a discontinuity in the NMR line splitting representing the orientational order. Furthermore, T (1) and T (2E) showed distinct temperature dependencies in the S (Ainc) phase and in the S* (C) phase.
引用
收藏
页码：838 / 840
页数：3
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