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A comparative study of nematic liquid crystals doped with harvested and non-harvested ferroelectric nanoparticles: phase transitions and dielectric properties

机译：掺杂有收获和未收获铁电纳米粒子的向列液晶的比较研究：相变和介电性能

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摘要

Harvested and non-harvested tin thiohypodiphosphate (Sn2P2S6) ferroelectric nanoparticles are used to dope the 4-n-octyl-4′-cyanobiphenyl liquid crystal (8CB). Due to their higher average spontaneous polarization, the harvested nanoparticles have stronger interactions with the liquid crystal molecules which leads to a higher order parameter as demonstrated by the increase in phase transition temperatures. This is confirmed by the results of dielectric characterization. In the homeotropic orientation, the increase in the order parameter leads to a higher dielectric permittivity. In the planar orientation, the coupling between the spontaneous polarization of the nanoparticles and the order parameter induces a slight reorientation of the liquid crystal director from the initial planar orientation, leading to an increase in the dielectric permittivity. This effect is more important for the liquid crystal doped with harvested nanoparticles.
机译：收获和未收获的硫代次磷酸锡（Sn 2 P 2 S 6 ）铁电纳米颗粒用于掺杂4- n -辛基-4'-氰基联苯液晶（8CB）。由于其较高的平均自发极化，所收获的纳米粒子与液晶分子具有更强的相互作用，这导致了更高阶的参数，如相变温度的升高所证明。电介质表征的结果证实了这一点。在垂直取向中，阶数参数的增加导致较高的介电常数。在平面取向中，纳米粒子的自发极化与有序参数之间的耦合引起液晶指向矢从初始平面取向稍微重新取向，导致介电常数增加。对于掺杂有收获的纳米颗粒的液晶来说，这种作用更为重要。

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