Frequency-controlled dielectrophoresis-driven wetting of nematic liquid crystals
Frequency-controlled dielectrophoresis-driven wetting of nematic liquid crystals
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DOI：
10.1088/1361-6463/ac6466
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发表时间：
2022-04
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影响因子：
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通讯作者：
C. Brown;A. Bhadwal;A. Edwards;I. Sage;A. Saxena;N. Mottram
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作者：
C. Brown;A. Bhadwal;A. Edwards;I. Sage;A. Saxena;N. Mottram
我们表明，各向异性向列液晶固着液滴的表面局域介电电泳驱动的润湿遵循相同的关系，cos[θ(Vo)]=cos[θY]−βVo2，该关系先前已在各向同性液滴中发现，即使向列液晶相具有单轴介电常数张量。我们还证明，介电润湿系数 β 决定了接触角从 θY 到 θVo 的减小幅度，通过电势差 Vo 的作用，可以通过高色散向列液晶液滴下方叉指电极之间施加的电压频率来控制。我们对向列相液滴内电场引起的二维 n 向畸变进行 Q 张量建模，阐明了当 θVo−θY 超过 3°–4° 时，这种线性关系如何适用于电压。
We show that surface-localized dielectrophoresis-driven wetting of anisotropic nematic liquid crystal sessile droplets obeys the same relationship, cos[θ(Vo)]=cos[θY]−βVo2 , which has previously been found for isotropic liquid droplets, even though the nematic liquid crystal phase possesses a uniaxial dielectric permittivity tensor. We also demonstrate that the dielectrowetting coefficient β , which determines the magnitude of the reduction in the contact angle, from θY to θVo , through the action of a potential difference Vo , can be controlled by the frequency of the applied voltage between interdigitated electrodes beneath a droplet of highly dispersive nematic liquid crystal. Our Q-tensor modelling of the electric field-induced 2-dimensional n-director distortions within a nematic droplet elucidates how this linear relationship holds for voltages when θVo−θY exceeds 3°–4°.