Unusual polarity-dependent patterns in a bent-core nematic liquid crystal under low-frequency ac field

Ying Xiang, Meng Jie Zhou, Ming Ya Xu, Péter Salamon, Nándor Éber, Ágnes Buka

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Abstract

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.

Original languageEnglish
Article number042501
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume91
Issue number4
DOIs
Publication statusPublished - Apr 2 2015

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ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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