Transparent Sheet Can Transform to Mirrored State

Feb-18-13 A new light-controlling sheet able to switch between mirror and transparent states could help to reduce energy use by shutting out sunlight during the hottest times of the day.

Developed by AIST, the system consists of a sheet attached to the window with a small, 0.1mm gap between the two. When small voltage is applied, the system electrolyzes the moisture in the air within the gap and converts it to hydrogen, which allows the sheet to switch between mirror and transparent states.

While light-controlling glass does exist already, the energy can still radiate into the room as heat. The new design controls light by reflection, blocking out the sunlight more efficiently, and also works more quickly than current designs.

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