Revealing the uniaxial to biaxial nematic liquid crystal phase transition via distinctive electroconvection

Revealing the uniaxial to biaxial nematic liquid crystal phase transition via distinctive electroconvection
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通过独特的电对流揭示单轴到双轴向列液晶相变

DOI:
10.1063/1.3138867
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发表时间:
2009-05
影响因子:
4
通讯作者:
H. F. Gleeson
H. F. Gleeson
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
项颖;H. F. Gleeson

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本文报道了双芯液晶单轴和双轴相变过程中的电对流现象。观察到两个EC不稳定性。Prewavy_1,它只存在于单轴相,具有平行于摩擦方向的条纹,器件厚度的顺序的周期性,以及在单轴向双轴过渡附近发散的起始电压。在整个摩擦区都存在以垂直于摩擦方向的条纹和两倍于器件厚度的周期性为特征的prewavy_2不稳定性。我们的观察结果解释通过在单轴向双轴过渡的电导率各向异性的变化。
Electroconvection (EC) phenomena are reported in the uniaxial and biaxial nematic phases of a bent-core liquid crystal. Two EC instabilities are observed. Prewavy_1, which exists only in the uniaxial phase, has stripes parallel to the rubbing direction, a periodicity of order of the device thickness, and an onset voltage that diverges near the uniaxial to biaxial transition. The prewavy_2 instability, characterized by stripes perpendicular to the rubbing direction and a periodicity of twice the device thickness, exists across the entire nematic regime. Our observations are explained through changes in the electrical conductivity anisotropy at the uniaxial to biaxial transition.
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