Darkening rear-view mirror:
Additional uses for gigantic nanoparticles can be found in the area of screen technology. The BMW Group is using this technology in rear-view mirrors, where nanoparticles can cause an electrochemical effect to take place i.e. the darkening of a screen in response to light incidence. Electrochrome glass is made up of laminate composed of several layers, and if one applies a current of just a few volts between the two electrode layers, light-alloy lithium ions will pass through a plastic layer and link up with a metal oxide to form a complex that can absorb light. This is turn results in the screen darkening. If one reverses the polarity of the current, the metal oxide complex dissolves itself again. This process takes several minutes, however. "In just a short period of time we can darken a screen by up to 80 percent", comments a spokesperson at the BMW Group.
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