Threshold properties of nanodoped surface stabilized ferroelectric liquid crystals under electric and magnetic fields
Threshold properties of nanodoped surface stabilized ferroelectric liquid crystals under electric and magnetic fields
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DOI：
10.1016/j.molliq.2016.05.004
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发表时间：
2016-08
影响因子：
6
通讯作者：
S. Shoarinejad;A. Sadeghisahebzad
中科院分区：
文献类型：
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作者：
S. Shoarinejad;A. Sadeghisahebzad
掺杂铁电纳米粒子的表面稳定铁电液晶（SSFLC）在外场中表现出有趣的极化和取向行为。在这项工作中，我们研究了纳米掺杂的SSFLC同时受到电场和磁场的行为。计算了纯体系和纳米掺杂体系的阈值磁场和极化矢量的最大偏差，揭示了自发极化对磁场阈值和电场的强烈影响。我们假设近晶层由具有固定取向的均匀平面组成，并且由于纳米颗粒的存在，该系统没有恒定层厚的位错。比较所得到的结果与过渡行为在一个纯电池中的纳米掺杂的纳米分散体的有序行为，即使在低浓度的显着影响。结果表明，铁电纳米粒子的存在和自发极化以及其他一些材料和外部参数的阈值磁场的依赖性。确定了纯的和纳米掺杂的SSFLC系统的均匀配置的稳定性的边界。研究还发现，对于SSFLC结构，超过临界厚度之间的边界板的细胞，弗雷德里克斯阈值场将不敏感的细胞厚度。
Surface stabilized ferroelectric liquid crystal (SSFLC) doped with ferroelectric nanoparticles shows interesting polarization and orientational behavior in external fields. In this work we study the behavior of a nanodoped SSFLC subjected simultaneously to electric and magnetic fields. The threshold fields and maximum deviation of the polarization vectors for a pure and nanodoped system are calculated and the strong influence of spontaneous polarization on magnetic threshold field is revealed as well as on electric field. We assume that the smectic layers consist of uniform planes with a fixed orientation and the system is free from dislocation of constant layer thickness due to nanoparticles. Comparing the obtained results for a nanodoped one with the transition behavior in a pure cell shows the significant influences of nano dispersions on ordering behavior even at low concentrations. The results exhibit the dependence of magnetic threshold field on the presence of ferroelectric nanoparticles and the spontaneous polarization as well as some other material and external parameters. The boundaries for the stability of the uniform configuration of a pure and nanodoped SSFLC system are determined. It is also found that for a SSFLC structure, beyond a critical thickness between the boundary plates of the cell, the Fredericks threshold fields would not be sensitive to the cell thickness.