NDLI: Preparation of a fast photochromic ormosil matrix coating for smart windows

Content Provider	Springer Nature Link
Author	Meng, Qinghua Wang, Guoqing Jiang, Hong Wang, Yun Xie, Shaoai
Copyright Year	2013
Abstract	A novel photochromic dye (NPB)-doped ormosil matrix coating with fast spectrokinetics was studied as functional materials for smart windows. First, the NPB was modified into a reactive silylated dye (NPB-Si) by a silane coupling agent. Then, the NPB-Si was hydrolyzed and copolycondensed with methyl triethoxysilane to form the ormosil (NPB-PMS) via the sol–gel method. Finally, the photochromic ormosil matrix coating on the substrate was obtained by the following spin-coating process. Upon the activation by the UV irradiation, the ormosil coating displayed the characteristic dual absorption peaks at 504 and 628 nm, which indicated as a valuable neutral tone. The dual absorption is due to the existence of photoisomers. On the basis of the theoretical calculation, the trans–cis photoisomers displayed the longer wavelengths in visible region than those of trans–trans ones, which was due to the less coplanarity. The kinetics studies of coloration and decoloration of NPB-PMS indicated an accelerated conversion process than that of NPB-doped polystyrene coating. The improved spectrokinetics of NPB-PMS coating is ascribed to the nanoscaled cavities observed in their surfaces, which offered enough space for molecular rotation during the photochromism. Our results also demonstrated that the NPB-PMS coating had much better solvent wash-off resistance than the physically doped coating.
Starting Page	5862
Ending Page	5870
Page Count	9
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	48
Issue Number	17
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2013-04-26
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Characterization and Evaluation of Materials Polymer Sciences Continuum Mechanics and Mechanics of Materials Crystallography Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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