Counterion-Induced Reversibly Switchable Transparency in Smart Windows
- Authors
- Lee, Chang Hwan; Lim, Ho Sun; Kim, Jooyong; Cho, Jeong Ho
- Issue Date
- Sep-2011
- Publisher
- AMER CHEMICAL SOC
- Keywords
- polyelectrolytes; tunable transparency; smart windows; ion exchange; functionality; saving on energy
- Citation
- ACS NANO, v.5, no.9, pp.7397 - 7403
- Journal Title
- ACS NANO
- Volume
- 5
- Number
- 9
- Start Page
- 7397
- End Page
- 7403
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/13591
- DOI
- 10.1021/nn202328y
- ISSN
- 1936-0851
- Abstract
- 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 methacrylata] 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 he 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 far efficiently conserving on energy usage in the interior of buildings.
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Collections - College of Engineering > Department of Organic Materials and Fiber Engineering > 1. Journal Articles
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