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New 'smart window' system with unprecedented performance

Date:
September 21, 2011
Source:
American Chemical Society
Summary:
A new "smart" window system has the unprecedented ability to inexpensively change from summer to winter modes, darkening to save air conditioning costs on scorching days and returning to crystal clarity in the winter to capture free heat from the sun, scientists are reporting.

A new "smart" window system has the unprecedented ability to inexpensively change from summer to winter modes, darkening to save air conditioning costs on scorching days and returning to crystal clarity in the winter to capture free heat from the sun, scientists are reporting.

Their study appears in the journal ACS Nano.

Ho Sun Lim, Jeong Ho Cho, Jooyong Kim and Chang Hwan Lee point out that the drive for energy conservation has fostered efforts to develop new types of window glass for everything from skylights and windows in houses to conference room walls in offices. "Smart" windows that reflect sunlight away from buildings in summer and switch back to full transparency in winter already are available. But they have many drawbacks, including high cost, rapid deterioration in performance, and manufacturing processes that involve potentially toxic substances. So, the researchers set out to develop a smart window that overcomes these drawbacks.

They discovered that using a polymer, so-called "counterions" and a solvent such as methanol was an inexpensive and less harsh way to make a stable, robust smart window. It has the added advantage of being extremely tunable -- quickly and easily switching from 100% opaque to almost completely clear in seconds.

"To our knowledge, such extreme optical switching behavior is unprecedented among established smart windows," the authors state. "This type of light control system may provide a new option for saving on heating, cooling and lighting costs through managing the light transmitted into the interior of a house."


Story Source:

The above story is based on materials provided by American Chemical Society. Note: Materials may be edited for content and length.


Journal Reference:

  1. Chang Hwan Lee, Ho Sun Lim, Jooyong Kim, Jeong Ho Cho. Counterion-Induced Reversibly Switchable Transparency in Smart Windows. ACS Nano, 2011; 110815112400043 DOI: 10.1021/nn202328y

Cite This Page:

American Chemical Society. "New 'smart window' system with unprecedented performance." ScienceDaily. ScienceDaily, 21 September 2011. <www.sciencedaily.com/releases/2011/09/110921132346.htm>.
American Chemical Society. (2011, September 21). New 'smart window' system with unprecedented performance. ScienceDaily. Retrieved July 23, 2014 from www.sciencedaily.com/releases/2011/09/110921132346.htm
American Chemical Society. "New 'smart window' system with unprecedented performance." ScienceDaily. www.sciencedaily.com/releases/2011/09/110921132346.htm (accessed July 23, 2014).

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