Asynchronous Time-Resolved FT-IR Study of the Dynamical Behavior of Ferroelectric Liquid Crystal with a Tolane Ring
Asynchronous Time-Resolved FT-IR Study of the Dynamical Behavior of Ferroelectric Liquid Crystal with a Tolane Ring
复制标题
具有 Tolane 环的铁电液晶动态行为的异步时间分辨 FT-IR 研究
DOI：
10.1366/0003702971940756
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
Y. Ozaki
中科院分区：
文献类型：
--
作者：
N. Katayama;M. Czarnecki;M. Satoh;T. Watanabe;Y. Ozaki
用非同步时间分辨傅里叶变换红外光谱方法，测量了近晶C相中含甲苯环的铁电液晶(S)-4-methylhexyl-4-[4-(decyloxy)phenylethynyl]-2-fluorobenzate，在不同温度和电压下的瞬时红外光谱。研究了温度和电压对分子电场诱导重定向的速率和倾角的影响。观察到的光强变化的绝对值及其符号可以用样品的静态性质来解释。在不同实验条件下得到的光谱表明，温度和外加电压分别改变了液晶的倾斜角和重新取向的角速度。在不同的条件下，红外主带显示出非常相似的随时间变化的强度变化，表明整个分子同时重新定向，而不考虑温度和外加磁场强度，就像分子是一个刚性棒一样。
Transient infrared spectra of a ferroelectric liquid crystal with a tolane ring, (S)-4-methylhexyl-4-[4-(decyloxy)phenylethynyl]-2-fluorobenzate, in the smectic C phase have been measured under various temperatures and voltages by use of an asynchronous time-resolved FT-IR method. The effects of temperature and voltage on the rate and tilt angle of the electric field-induced reorientation of the molecule have been studied. The absolute values of the observed intensity changes and their sign during the switching can be explained by the static properties of the sample. The spectra obtained under the different experimental conditions suggest that the temperature and applied voltage alter the tilt angle and angular velocity of reorientation of the liquid crystal, respectively. Dominant infrared bands show very similar time-dependent intensity changes under various conditions, indicating that the whole molecule reorients simultaneously irrespective of temperature and the applied field strength as though the molecule were a rigid rod.