The influence of thermodynamic equilibrium state prior to the phase transition on the alignment of ferroelectric liquid crystal
The influence of thermodynamic equilibrium state prior to the phase transition on the alignment of ferroelectric liquid crystal
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相变前热力学平衡状态对铁电液晶取向的影响
DOI：
10.7498/aps.59.6261
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发表时间：
2010-09
期刊：
影响因子：
--
通讯作者：
Lu Xing-Hai
中科院分区：
文献类型：
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作者：
Liu Yong-Gang;Tang Xian-Zhu;Xuan Li;Peng Zeng-Hui;Lu Xing-Hai
本实验选用ZLI-3654铁电液晶和SE-3140取向材料制备了铁电液晶器件。为了研究相变前的热力学平衡状态对FLC取向的影响，通过改变相变过程中的冷却速率和相变前的热力学平衡状态，进行了10组实验。通过比较器件的静态对比度，从实验上得出结论：手性向列相-近晶相A（N * -SmA）相变前的热力学平衡状态对实现FLC器件的均匀取向起着重要作用。样品的静态对比度可达620 ∶1，N * -SmA相变前的热力学平衡状态有利于形成高对比度FLC器件。该结论对I <$→N *<$→SmA <$→S * mC <$→Cr相序FLC器件的制备具有理论和实际指导意义。
In this experiment, devices of ferroelectric liquid crystal (FLC) were prepared by selecting ZLI-3654 FLC and SE-3140 alignment material. In order to study the influence of thermodynamic equilibrium state before the phase transition on the alignment of FLC, ten sets of experiments were carried out by changing the cooling rate during phase transition and thermodynamic equilibrium state before the phase transition. From experiments, a conclusion that the thermodynamic equilibrium state prior to chiral nematic-smectic A (N * -SmA) phase transition play an important role in realizing a uniform alignment of FLC devices, was obtained by comparing static contrasts of the devices. The static contrast ratio of our samples reached 620 ∶1 and the thermodynamic equilibrium state before N * -SmA phase transition was conducive to the formation of high contrast ratio FLC devices. The conclusion can provides a theoretical and practical guidance for the fabrication of FLC devices with I←→N * ←→SmA←→S * mC←→Cr phase sequence.