By Haifeng Yu
Contemporary growth during this box exhibits that integrating photochromic molecules into LC fabrics allows one to photo-manipulate precise positive factors 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 complicated 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 distinct performances within the kind of low-molecu. �Read more...
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Extra resources for Dancing with Light : Advances in Photofunctional Liquid-Crystalline Materials
Synthesis of liquid-crystalline polyacrylates with laterally substituted mesogens, Macromolecules 20, pp. 233–234. 29 Chapter 2 Structures and Properties Generally, liquid crystals (LCs) are formed in rod-like organic molecules which interact through strongly anisotropic intermolecular forces. The LC properties are decided by their molecular structures. With the progress in LC researches, it has been becoming a common view that to show LC phases, the materials should meet the requirement of the following items: (1) Anisotropic geometry, that means the structure should be either elongated (linear) in shape or inhomogeneous.
Smectic LCs form well-defined layers that can slide over one another in a manner similar to that of soap. Several forms of smectic phases have been discovered and labeled from smectic A to smectic K currently. They are separated by their tilt angles (with respect to the plane normal) and packing formation. Some typical textures of these LCs are also shown in Fig. 16. 15 LCPs with diverse macromolecular architectures. Introduction of a chiral center into an LC molecule may bring about interesting properties.
43 44 Structures and Properties The mechanically rubbing technique has the advantage of being relatively straightforward, easy, and cheap, and generates very stable alignment layers. As it is already a widely applied process in industry, no large investments are required. Unfortunately, dust or static electricity might be produced, which could induce defects to the macroscopic alignment. Moreover, this contact method can only be applied on a flat surface; it shows no function on a curve one. Therefore, many new approaches for LC alignment have been developed afterwards.