Electric-field-induced patterns and their temperature dependence in a bent-core liquid crystal.
Electric-field-induced patterns and their temperature dependence in a bent-core liquid crystal.
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DOI：
10.1103/physreve.89.012502
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发表时间：
2014-01
期刊：
影响因子：
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通讯作者：
Y. Xiang;Yikun Liu;A. Buka;N. Éber;Zhi‐Yong Zhang;Mingya Xu;Everett Wang
中科院分区：
文献类型：
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作者：
Y. Xiang;Yikun Liu;A. Buka;N. Éber;Zhi‐Yong Zhang;Mingya Xu;Everett Wang
Two kinds of electroconvection patterns in an ether-bridged bent-core nematic liquid crystal material (BCN), which appear in different frequency ranges, are examined and compared. One is a longitudinal pattern with the stripes parallel to the orientation of the BCN and with a periodicity of approximately the cell thickness, occurring in the high-frequency range of several hundreds Hz; the other one is oblique stripes, which results in a zigzag pattern, and appears in the low-frequency range of several tens Hz. In addition, within an intermediate-frequency range, transformations from oblique to longitudinal and then to normal stripes occur at increased ac voltages. In particular, we investigated the temperature behavior of longitudinal and oblique stripes: When the temperature T increases and approaches the clearing temperature Tc, the contrast of the domains is enhanced and the frequency range of existence becomes wider, while the onset voltages increase only moderately instead of diverging, thus suggesting an isotropic mechanism of pattern formation.
