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Arrays of nanoparticles can on command to turn the window into a mirror, and Vice versa

A team of researchers at Imperial College London under the leadership of professors Joshua Edel and Alexei Kornysheva has developed a filter where you can adjust the distance between the nanoparticles. Due to this, the surface may be mirrored, or transparent, like ordinary glass.

To do this, scientists have created conditions in which gold nanoparticles are localized at the interface between two immiscible liquids. Feeding a small voltage, they demonstrated the features of the layer of nanoparticles, which, by changing its density, made the surface a mirrored or transparent.

The distance between the nanoparticles depend on whether the layer to pass or reflect light waves of different lengths. In one mode, all the waves are reflected, and the layer acts as a mirror, and in another, where the nanoparticles are subjected to dispersion, all waves pass freely through the filter, as through a conventional window.

Unlike the preceding nanoscopic systems, where chemical effects on the optical properties of the material changes irreversibly the electrical system from London reversible.

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