论文标题
一种新的方法，用于测量列液液晶体中金属丝janus颗粒的电场偶极矩
A novel method for measuring electric field induced dipole moments of metal-dielectric Janus particles in nematic liquid crystals
论文作者
论文摘要
Janus颗粒是具有至少两个具有不同物理或化学特性的表面的特殊类型的纳米或微粒颗粒。研究最多的Janus颗粒是金属二电颗粒，其中介电颗粒的一半表面涂有一层非常薄的金属层。外部电场诱导偶极矩，因此颗粒在浓缩水悬浮液中表现出自组装的动态结构。在这里，我们研究了AC电场下列明液晶中的金属丝钻颗粒，并通过两个颗粒的弹性和静电（Coulomb）之间的竞争，展示了一种新颖的方法，用于测量颗粒有效诱导的偶极矩。基于简单模型的颗粒计算出的极性性与实验中测得的有效极性性很好。我们的发现重要的是基于分散在各向异性培养基中的金属丝janus颗粒的功能材料。
Janus particles are special types of nano or micro particles possessing at least two surfaces with distinct physical or chemical properties. The most studied Janus particles are the metal-dielectric particles, in which half surface of dielectric particles is coated with a very thin layer of metals. The external electric field induces dipole moment, and consequently the particles exhibit self-assembled dynamic structures in concentrated aqueous suspensions. Here, we study metal-dielectric Janus particles in a nematic liquid crystal under AC electric field and demonstrate a novel method for measuring effective induced dipole moments of the particles, through competition between elastic and electrostatic (Coulomb) forces of the two particles. The calculated polarisability of the particles based on a simple model agrees well with the effective polarisability measured in the experiments. Our findings have important bearing on functional materials based on metal-dielectric Janus particles dispersed in an anisotropic medium.
