Design rules for 2D field mediated assembly of different shaped colloids into diverse microstructures
Design rules for 2D field mediated assembly of different shaped colloids into diverse microstructures
复制标题
二维场介导的不同形状胶体组装成不同微观结构的设计规则
DOI：
10.1039/d2sm01078j
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发表时间：
2022
期刊：
影响因子：
3.4
通讯作者：
Bevan, Michael A.
中科院分区：
文献类型：
--
作者：
Hendley, Rachel S.;Zhang, Lechuan;Bevan, Michael A.
将不同形状的颗粒组装成有序的微结构是创造多功能颗粒基材料和器件的一个开放的挑战。在这里，我们报告了二维(2D)交流电场介导的不同形状的胶体粒子组装成非晶态、液晶和晶态微结构的过程。所研究的颗粒形状包括圆盘、椭圆、正方形和矩形，这些形状表明各向异性和角曲率的系统变化如何决定所产生的微结构的数量和类型。交流电场诱导偶极相互作用来控制粒子的位置和取向顺序。微结构状态是通过粒子跟踪来计算有序参数来确定的，这与计算机模拟相一致，并显示了粒子堆积和偶极相互作用如何共同产生每种结构。结果表明，粒子形状和场条件的选择如何使动力学可行的路线组装向列相、四方和近晶液晶结构以及具有拉伸的4倍和6倍对称性的晶体。结果表明，可以组装所有相应的硬粒子相，但也显示了偶极相互作用如何影响和产生额外的微观结构。我们的发现为交流电场中不同形状颗粒的不同微观结构的组装提供了设计规则，这将使基于颗粒的材料、显示器和印刷技术成为可能。
Assembling different shaped particles into ordered microstructures is an open challenge in creating multifunctional particle-based materials and devices. Here, we report the two-dimensional (2D) AC electric field mediated assembly of different shaped colloidal particles into amorphous, liquid crystalline, and crystalline microstructures. Particle shapes investigated include disks, ellipses, squares, and rectangles, which show how systematic variations in anisotropy and corner curvature determine the number and type of resulting microstructures. AC electric fields induce dipolar interactions to control particle positional and orientational order. Microstructural states are determined via particle tracking to compute order parameters, which agree with computer simulations and show how particle packing and dipolar interactions together produce each structure. Results demonstrate how choice of particle shape and field conditions enable kinetically viable routes to assemble nematic, tetratic, and smectic liquid crystal structures as well as crystals with stretched 4- and 6-fold symmetry. Results show it is possible to assemble all corresponding hard particle phases, but also show how dipolar interactions influence and produce additional microstructures. Our findings provide design rules for the assembly of diverse microstructures of different shaped particles in AC electric fields, which could enable scalable and reconfigurable particle-based materials, displays, and printing technologies.