矿物纳米棒非水分散体系的电场诱导双折射
Electric field induced birefringence in non-aqueous dispersions of mineral nanorods
摘要：
磷酸镧（LaPO 4）纳米棒分散在乙二醇的非水溶剂中形成表现出大的固有双折射、高胶体稳定性和自组织成液晶相的能力的系统。为了探测这些棒色散的电光响应，我们在这里研究了电场诱导的双折射，也称为克尔效应，对于具有面内交流的各向同性浓缩液体状态。正弦电场，在直接施加（电极与样品接触）或外部施加（电极在样品池外部）场的条件下。在Maxwell-Wagner-OKonski理论的框架内对我们的棒状颗粒的电极化率进行分析，我们定量地解释了两种样品几何形状的诱导稳态双折射和电场之间的耦合作为电压频率的函数。这种非水透明系统的开关时间已被测量，并结合其高克尔系数和光学各向同性关态和非热相行为的特点，这代表了一个有前途的概念验证的各向异性纳米粒子悬浮液集成到新一代的电光器件。
英文摘要：
Lanthanum phosphate (LaPO4) nanorods dispersed in the non-aqueous solvent of ethylene glycol form a system exhibiting large intrinsic birefringence, high colloidal stability and the ability to self-organize into liquid crystalline phases. In order to probe the electro-optical response of these rod dispersions we study here the electric-field-induced birefringence, also called Kerr effect, for a concentrated isotropic liquid state with an in-plane a.c. sinusoidal electric field, in conditions of directly applied (electrodes in contact with the sample) or externally applied (electrodes outside the sample cell) fields. Performing an analysis of the electric polarizability of our rod-like particles in the framework of Maxwell-Wagner-OKonski theory, we account quantitatively for the coupling between the induced steady-state birefringence and the electric field as a function of the voltage frequency for both sample geometries. The switching time of this non-aqueous transparent system has been measured, and combined with its high Kerr coefficients and its features of optically isotropic offstate and athermal phase behavior, this represents a promising proof-of-concept for the integration of anisotropic nanoparticle suspensions into a new generation of electro-optical devices.
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