Dancing with Light: Advances in Photofunctional by Haifeng Yu


By Haifeng Yu

Recent development during this box shows that integrating photochromic molecules into LC fabrics allows one to photo-manipulate precise gains akin to photoinduced section 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 complicated point in photoresponsive LC fabrics. the topic is brought step by step, together with the fundamental wisdom of LCs, photoresponsive houses of LCs, and their specified performances within the kind of low-molecular-weight compound, polymer, cross-linked elastomer, and block copolymer.

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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.

6 Other Methods The usual way of characterizing LC phases is to identify the phase by POM, to establish the thermodynamic reversibility using DSC, 27 28 Introduction and to elucidate the molecular arrangements using XRD. The other spectroscopic tools like FTIR, FT-Raman spectroscopy, small-angle neutron scattering (SANS), and refractive index measurements have also been adopted. FTIR can be used to bond conformation of LC materials. Polarized absorption spectra can supply order information of mesogenic orientation.

Nissan SE-1211). LC Alignment Without the rubbing process, perfect homeotropic alignment is obtained. 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.

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