Xiang Ying, Zhou Meng-jie, Xu Ming-Ya, Salamon Péter, Éber Nándor, Buka Ágnes
School of Information Engineering, Guangdong University of Technology, Guangzhou 510006, People's Republic of China.
Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1121 Budapest, Konkoly Thege Miklós út 29-33, Hungary.
Phys Rev E Stat Nonlin Soft Matter Phys. 2015 Apr;91(4):042501. doi: 10.1103/PhysRevE.91.042501. Epub 2015 Apr 2.
Electric-field-induced patterns of diverse morphology have been observed over a wide frequency range in a recently synthesized bent-core nematic (BCN) liquid crystal. At low frequencies (up to ∼25 Hz), the BCN exhibited unusual polarity-dependent patterns. When the amplitude of the ac field was enhanced, these two time-asymmetrical patterns turned into time-symmetrical prewavylike stripes. At ac frequencies in the middle-frequency range (∼50-3000 Hz), zigzag patterns were detected whose obliqueness varied with the frequency. Finally, if the frequency was increased above 3 kHz, the zigzag pattern was replaced by another, prewavylike pattern, whose threshold voltage depended on the frequency; however, the wave vector did not. For a more complete characterization, material parameters such as elastic constants, dielectric permittivities, and the anisotropy of the diamagnetic susceptibility were also determined.
在最近合成的弯曲核向列相（BCN）液晶中，已在很宽的频率范围内观察到了各种形态的电场诱导图案。在低频（高达约25Hz）时，BCN呈现出异常的极性依赖图案。当交流电场的幅度增强时，这两种时间不对称图案转变为时间对称的预波状条纹。在中频范围（约50 - 3000Hz）的交流频率下，检测到了之字形图案，其倾斜度随频率变化。最后，如果频率增加到3kHz以上，之字形图案被另一种预波状图案取代，其阈值电压取决于频率；然而，波矢则不然。为了更全面地表征，还确定了诸如弹性常数、介电常数和抗磁磁化率各向异性等材料参数。
