Download PDF by Haifeng Yu: Dancing with Light : Advances in Photofunctional
By Haifeng Yu
Fresh growth during this box exhibits that integrating photochromic molecules into LC fabrics permits one to photo-manipulate distinctive good points reminiscent of photoinduced part transition, photocontrolled alignment and phototriggered molecular cooperative movement, resulting in their novel purposes past screens. This booklet 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 elemental wisdom of LCs, photoresponsive homes of LCs, and their unique performances within the type of low-molecu. �Read more...
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Extra info for Dancing with Light : Advances in Photofunctional Liquid-Crystalline Materials
For an isotropic fluid, S = 0, whereas for a perfectly aligned crystal, S = 1. 8, and this value generally decreases due to higher mobility and disorder as the temperature is raised. The S sharply decreases at the clearing point or phase transition temperature, as shown in the right of Fig. 7. 2 Mechanical Properties (Elastic Constant) When LC materials are deformed under an external field, they tend to restore their original states. To describe their mechanical properties, three elastic constants, splay (K11), twist (K22), and bend (K33) are defined according to the elastic theory (Fig.
Blue phases are one of the most interesting self-organization structures in the field of LC researches. 18 shows typical examples of blue phase, which generally appears between a CLC phase and an isotropic liquid. Blue phase LCs usually possess a very narrow temperature range of only a few degrees of Kelvin. 17 One example of chiral LC phase obtained by introducing a chiral molecule. 18 Typical examples of blue phase of LCs. (a) A cylindrical region of double-twist structure; (b) Intersection of three doubletwist cylinders which form a defect; (c) Arrangement of doubletwist cylinders which may exist in BPI; and (d) Arrangement of double-twist cylinders which may exist in BPII.
The differences, ∆e = e|| − ε⊥ is called the dielectric anisotropy. If the dielectric constant along the director (e||), is larger than that in the direction perpendicular to it (ε⊥), one calls it positive anisotropy (Fig. 9). Under an electric field, LCs with positive anisotropy orient with their molecular long axis along the electric direction (E), whereas LCs with negative anisotropy orient perpendicularly to E. The magnitude of ∆e determines the strength of interaction between the LCs and applied electric field.
Dancing with Light : Advances in Photofunctional Liquid-Crystalline Materials by Haifeng Yu