By Haifeng Yu
Contemporary growth during this box exhibits that integrating photochromic molecules into LC fabrics allows one to photo-manipulate distinctive positive aspects reminiscent of photoinduced section transition, photocontrolled alignment and phototriggered molecular cooperative movement, resulting in their novel functions past screens. 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 elemental wisdom of LCs, photoresponsive houses of LCs, and their particular performances within the type of low-molecu. �Read more...
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Extra resources for Dancing with Light : Advances in Photofunctional Liquid-Crystalline Materials
When an indium tin oxide (ITO) plate was immersed into a solution of the naphthalene-functionalized siloxane, a highly ordered surface was formed by supramolecular self-assembly. Such a film was capable of inducing uniform LC alignment, which could be attributed to two simultaneously occurred processes. One is related to the creation of stronger intermolecular interactions between the large p-surfaces of naphthalene-functionalized siloxane and the other involve the covalent grafting of these precipitating oligosiloxanes onto the ITO surface.
14 LC alignment on the surface of polyimide films by rubbing treatment. Picture of a rubbing machine and the scheme of rubbing process (above). Atom force microscopy (AFM) image showing a rubbed polyimide film coated on a glass slide (below). Two mechanisms have been proposed to explain the rubbing mechanism, which has been debated for decades. For thermosetting polymers (like polyimide), microgrooves with high regularity and suitable interval (about 30 nm) appear along the rubbing direction after the rubbing process.
However, the detailed mechanism still remains unclear. 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.