By Haifeng Yu
Recent development during this box exhibits that integrating photochromic molecules into LC fabrics permits one to photo-manipulate distinct beneficial properties akin to photoinduced part transition, photocontrolled alignment and phototriggered molecular cooperative movement, resulting in their novel purposes past monitors. This publication introduces readers to this box, from the first- to the complex point in photoresponsive LC fabrics. the topic is brought step by step, together with the fundamental wisdom of LCs, photoresponsive homes of LCs, and their targeted performances within the kind of low-molecular-weight compound, polymer, cross-linked elastomer, and block copolymer.
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Additional info for Dancing with Light: Advances in Photofunctional Liquid-Crystalline Materials
Compared with a crystalline material, the supercooling of an LC–LC or an LC– isotropic transition is typically small. This is a fast and facile way to judge the likely presence of an LC material by DSC. 2 Polarizing Optical Microscopy Although POM observation is one of the most simple and convenient methods to characterized one LC sample, it can provide a great deal of information not available with other techniques. Therefore, it is one of the most popular methods in LC researches. , water) often have the same refractive index in all directions.
22. 20 LC alignment based on supramolecular self-assembly of naphthalene functionalized siloxane. , Copyright 2002, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Advantages of the oblique evaporation technique include the fact that it is a contactless method, posing no risk of damaging the LC Alignment substrate either mechanically or by electrostatic discharge. The deposited layers are thinner than their organic equivalents, so less influence on the optical and dielectric behavior of the device is to be expected.
In contrast, many anisotropic materials have optical properties that vary with the orientation of incident light with respect to the axes of LCs. At this case, light will propagate at different rates in different directions through LC materials, because light travels through different directions at different velocities. In observation with POM, the LC sample is placed between a pair of two-crossed polarizers, that is, two polarizers that are rotated by 90° with respect to one another. 22 shows schematic illustration of the principle of a POM.