Phase Transition Temperatures of a Nematic Liquid Crystal in the Presence of Noise and DC Fields

IF 1.5 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Jong-Hoon Huh, Takumu Higashi, Tatsuya Yamasaki, Tomoyuki Nagaya
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引用次数: 0

Abstract

Thermal phase transitions from a nematic liquid-crystal phase to an isotropic phase are reported in this study. The phase transition temperature Tc under noise and DC fields was examined during continuous heating processes with different heating rates R (1–10 °C/min). Tc was determined as functions of the noise intensity VN and the DC intensity V. Evidently, Tc shows different behavior with respect to the fields at fixed values of R. Tc decreased monotonously with VN, whereas it exhibited nonmonotonic behavior in Tc(V). These shifts in Tc are quite different from that previously observed in the AC field. It was found that DC field-induced electroconvection is responsible for the unexpected nonmonotonic behavior. In particular, the transition between the dynamic scattering modes (i.e., DSM1 and DSM2) may be related to this behavior. The different behavior for the noise and DC fields was confirmed using various values of R. Furthermore, the present results in comparison with the previous results for the AC field were discussed.
噪音和直流电场下向列液晶的相变温度
本研究报告了从向列液晶相到各向同性相的热相变。在不同加热速率 R(1-10 °C/分钟)的连续加热过程中,考察了噪声和直流电场下的相变温度 Tc。Tc 随噪声强度 VN 和直流强度 V 的变化而单调下降,而 Tc(V) 则表现出非单调性。Tc 的这些变化与之前在交流场中观察到的变化截然不同。研究发现,直流电场诱导的电对流是造成这种意想不到的非单调行为的原因。特别是动态散射模式(即 DSM1 和 DSM2)之间的转换可能与这种行为有关。使用不同的 R 值证实了噪声场和直流场的不同行为。
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来源期刊
CiteScore
3.40
自引率
17.60%
发文量
325
审稿时长
3 months
期刊介绍: The papers published in JPSJ should treat fundamental and novel problems of physics scientifically and logically, and contribute to the development in the understanding of physics. The concrete objects are listed below. Subjects Covered JPSJ covers all the fields of physics including (but not restricted to) Elementary particles and fields Nuclear physics Atomic and Molecular Physics Fluid Dynamics Plasma physics Physics of Condensed Matter Metal, Superconductor, Semiconductor, Magnetic Materials, Dielectric Materials Physics of Nanoscale Materials Optics and Quantum Electronics Physics of Complex Systems Mathematical Physics Chemical physics Biophysics Geophysics Astrophysics.
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