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Although windows can naturally heat buildings in the cold seasons, during the summer they can easily overheat a building. To help with this problem, Japanese scientists at AIST recently developed a thin film which can make transparent glass turn into mirrors. The use of such a window in buildings or automobiles could reduce the energy consumed by air conditioners by more than 30%. The scientists, Kazuki Yoshimura and Shanhu Bao developed the thin film material. Previous research works have focused on the use of thin films made of magnesium-nickel alloy that behave as switchable mirrors: these, however, all have a yellow tinge in their transparent state.
The switching mechanism in Yoshimura and Bao’s window, is created by altering the gas content between the two glass panes. By introducing a small amount of hydrogen into the atmosphere between the panes, the glass acts as a transparent window. Alternatively, adding a small amount of oxygen with no hydrogen forms a reflecting mirror. :: AIST
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Don't expect this one at home anytime soon. The switching process requires the generation of either oxygen or hydrogen, so each window will need it's own electrolysis device to perform the switching. This is still at the "research" stage.
Mike