Electric-Field-Induced Viscosity Change of a Nematic Liquid Crystal with Gold Nanoparticles
Electric-Field-Induced Viscosity Change of a Nematic Liquid Crystal with Gold Nanoparticles
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DOI：
10.1002/cphc.201402850
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发表时间：
2015-04-07
期刊：
影响因子：
2.9
通讯作者：
Hanasaki, Tomonori
中科院分区：
文献类型：
--
作者：
Kaneko, Kosuke;Ujihara, Yoshihiro;Hanasaki, Tomonori
讨论了由向列相液晶(LC)和覆盖有介晶基团的金纳米颗粒组成的复合材料的电流变(ER)效应。金纳米粒子被烷基链和液晶化合物覆盖。用偏光显微镜(POM)研究了烷基链长、烷基覆盖度和介晶基团对纳米粒子与液晶相容性的影响。与5CB相比，向列型LC(5CB)中金纳米粒子的存在导致了电流变响应的增强。本研究中观察到的显著的ER效应得到了所提出的两种机制的支持，即同质机制和非均质机制。这项研究展示了由液晶和金纳米颗粒组成的混合系统改善电流变效应的潜力。
The electro-rheological (ER) effect of a composite material consisting of a nematic liquid crystal (LC) and gold nanoparticles covered with mesogenic groups is discussed. The gold nanoparticles are covered by alkyl chains and liquid-crystalline compounds. The influences of the alkyl-chain length and the coverage by the alkyl chain and the mesogenic group on the miscibility of the nanoparticles with the LC are investigated by polarizing optical microscopy (POM). The presence of the gold nanoparticles in the nematic LC (5CB) leads to an enhanced ER response compared to that observed for 5CB. The prominent ER effect observed in this study is supported by the two mechanisms proposed, that is, the homogeneous and heterogeneous mechanisms. This study demonstrates the potential of a hybrid system consisting of an LC and gold nanoparticles to improve the ER effect.