磁性纳米粒子在 5CB 液晶中的结构。

Structuralization of magnetic nanoparticles in 5CB liquid crystals.

机构信息

Institute of Experimental Physics, Slovak Academy of Sciences, Watsonová 47, 04001, Košice, Slovakia.

出版信息

Soft Matter. 2017 Nov 8;13(43):7890-7896. doi: 10.1039/c7sm01234a.

PMID:29022016

Abstract

This work is devoted to the study of highly stable composite systems of the liquid crystal 4-n-pentyl-4'-cyanobiphenyl (5CB) doped with CoFeO magnetic nanoparticles. Ferronematic samples were prepared with two different weight concentrations: sample A 0.085 wt% and sample B 0.062 wt%. The interaction of CoFeO nanoparticles with the liquid crystal was investigated by small-angle X-ray-scattering and magnetization measurements. The obtained results reveal aggregates formed by magnetic nanoparticles that are oriented in the nematic phase. Moreover, the prepared samples show unexpected behaviour of a sudden change in magnetization, which is unusual for such ferronematics.

摘要

这项工作致力于研究高度稳定的液晶 4-正戊基-4'-氰基联苯（5CB）与 CoFeO 磁性纳米粒子掺杂的复合材料体系。Ferronematic 样品制备了两种不同的重量浓度：样品 A 为 0.085wt%，样品 B 为 0.062wt%。通过小角 X 射线散射和磁化测量研究了 CoFeO 纳米粒子与液晶的相互作用。结果表明，磁性纳米粒子形成了在向列相取向的聚集体。此外，所制备的样品表现出磁化突然变化的意外行为，这对于这种铁电体来说是不寻常的。