挠曲电与电对流中的时间尺度竞争
Flexoelectricity and competition of time scales in electroconvection
摘要：
在指向矢弛豫时间尺度和交流驱动电压周期相当的条件下，发现了双相液晶中的电对流行为。所研究的NLC表现出标准EC（s-EC）的不稳定性的开始，除了一个化合物，其中非标准EC（ns-EC）已被检测到。在相应的频率范围内，随着驱动频率的降低，导电s-EC的阈值电压显著下降，而电介质s-EC的阈值电压则显著上升。我们表明，列入的挠曲电效应的理论描述导电的S-EC导致定量协议，而介电的S-EC实现了定性协议。ns-EC的阈值电压的频率依赖性非常类似的电介质s-EC。
英文摘要：
Novel behavior in electroconvection (EC) has been detected in nematic liquid crystals (NLCs) under the condition of comparable timescales of the director relaxation and the period of the driving ac voltage. The studied NLCs exhibit standard EC (s-EC) at the onset of the instability, except one compound in which nonstandard EC (ns-EC) has been detected. In the relevant frequency region, the threshold voltage for conductive s-EC bends down considerably, while for dielectric s-EC it bends up strongly with the decrease of the driving frequency. We show that inclusion of the flexoelectric effect into the theoretical description of conductive s-EC leads to quantitative agreement, while for dielectric s-EC a qualitative agreement is achieved. The frequency dependence of the threshold voltage for ns-EC strongly resembles that of the dielectric s-EC.
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