Two-dimensional assemblies of nematic colloids in homeotropic cells and their response to electric fields
Two-dimensional assemblies of nematic colloids in homeotropic cells and their response to electric fields
复制标题
垂直细胞中向列胶体的二维组装及其对电场的响应
DOI：
10.1039/c6sm00929h
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发表时间：
2016
期刊：
影响因子：
3.4
通讯作者：
Yuta Tamura and Yasuyuki Kimura
中科院分区：
文献类型：
--
作者：
Yoshinori Furukawa;Ken Nagashima;Shun-ichi Nakatsubo;Izumi Yoshizaki;Haruka Tamaru;Taro Shimaoka;Takehiko Sone;Etsuro Yokoyama;Salvador Zepeda;Takanori Terasawa;Harutoshi Asakawa;Ken-ichiro Murata and Gen Sazaki;杉山 和彦;Yuta Tamura and Yasuyuki Kimura
分散在向列液晶中的微米级胶体粒子通过向列场取向变形诱导的各向异性相互作用相互作用。在所谓的偶极向列胶体中，它们的相互作用是偶极-偶极型的。利用光学镊子利用各向同性排列的向列细胞中反平行偶极向列胶体之间的吸引力，制备了具有各种特性的二维非紧密排列的胶体组合。由多边形、正方形和四面体组成的结构使用等大小的粒子构建，六边形结构使用两种大小的粒子构建。由于向列场对电场的敏感性，本文还研究了所制备的组件对交变电场的响应。所有组件均表现出均匀的可逆收缩，其收缩率取决于结构。对于包含四面体单元的六边形，在5 Vrms时，组件的线性尺寸的最大收缩率超过20%。
Micrometer-sized colloidal particles dispersed in nematic liquid crystals interact with each other through anisotropic interactions induced by orientational deformation of the nematic field. In the case of so-called dipole nematic colloids, their interaction is of the dipole–dipole type. Two-dimensional, non-close-packed colloidal assemblies having various characteristics were fabricated using optical tweezers by exploiting the attraction between anti-parallel dipole nematic colloids in homeotropically aligned nematic cells. Structures comprising polygons, squares, and tetrahedra were built using equal-sized particles, and hexagonal structures were built using particles of two sizes. As the nematic field is sensitive to electric fields, the response of the fabricated assemblies toward an alternating electric field was also studied. All assemblies exhibited homogeneous reversible shrinkage, and their shrinkage rates were dependent on the structure. The maximum shrinkage rate in the linear dimension of the assemblies was over 20% at 5 Vrms for a hexagon comprising tetrahedral units.