Biaxial ferromagnetic liquid crystal colloids
Biaxial ferromagnetic liquid crystal colloids
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DOI：
10.1073/pnas.1601235113
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发表时间：
2016-09-20
影响因子：
11.1
通讯作者：
Smalyukh, Ivan I.
中科院分区：
文献类型：
--
作者：
Liu, Qingkun;Ackerman, Paul J.;Smalyukh, Ivan I.
复合材料的设计和实际实现，结合联合收割机的流动性和不同形式的有序在介观尺度是其中的重大基础科学的挑战。这些复合材料在技术应用方面也有很大的潜力，从信息显示到超材料。在这里，我们介绍了共存的极性和双轴有序的有机分子和磁性胶体积木表现出最低的对称取向顺序的流体。在不同长度尺度的相互作用的引导下，这种流体的棒状有机分子自发地沿着被称为“指向矢”的方向沿着取向，而磁性胶体纳米片以它们的偶极矩彼此平行但指向指向矢的角度排列，在没有外部场的情况下产生宏观磁化。这种流体的简单磁开关与基于弹性和磁力矩的竞争作用的模型的预测一致，使以前无法控制的光。
The design and practical realization of composite materials that combine fluidity and different forms of ordering at the mesoscopic scale are among the grand fundamental science challenges. These composites also hold a great potential for technological applications, ranging from information displays to metamaterials. Here we introduce a fluid with coexisting polar and biaxial ordering of organic molecular and magnetic colloidal building blocks exhibiting the lowest symmetry orientational order. Guided by interactions at different length scales, rod-like organic molecules of this fluid spontaneously orient along a direction dubbed "director," whereas magnetic colloidal nanoplates order with their dipole moments parallel to each other but pointing at an angle to the director, yielding macroscopic magnetization at no external fields. Facile magnetic switching of such fluids is consistent with predictions of a model based on competing actions of elastic and magnetic torques, enabling previously inaccessible control of light.