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Counterion-Induced Reversibly Switchable Transparency in Smart Windows

renchunxiao 添加于 2011/9/26 16:43:58  1839次阅读 | 0次推荐 | 0个评论

Smart windows that can reversibly alternate between extreme optical characteristics via clicking counteranions of different hydration energies were developed on glass substrates through the facile spray-casting of poly[2-(methacryloyloxy)ethyltrimethylammonium chloride-co-3-(trimethoxysilyl)propyl methacrylate]. The optical transmittance was either 90.9% or 0% over the whole spectral range when alternately immersed in solutions containing thiocyanate (SCN–) or bis(trifluoromethane)sulfonimide (TFSI–) ions, respectively. The extreme optical transitions were attributed to formation of microporous structures via the molecular aggregation of polyelectrolyte chains bearing TFSI– ions in methanol. Because the smart windows were either highly transparent toward or completely blocking of incident light upon direct counterion exchange, this kind of nanotechnology may provide a new platform for efficiently conserving on energy usage in the interior of buildings.

作 者:Chang Hwan Lee,Ho Sun Lim,Jooyong Kim,Jeong Ho Cho,
期刊名称: American Chemical Society
期卷页: 第卷 第期 ~页
学科领域:工程材料 » 有机高分子材料 » 塑料
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原文链接:http://pubs.acs.org/doi/abs/10.1021/nn202328y?prevSearch=%255BContrib%253A%2BHo%2BSun%2BLim%255D&searchHistoryKey=
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关键词: polyelectrolytes, tunable transparency, smart windows, ion exchange, functionality, saving on energy
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