At MIT have created Windows which quickly change the transparency Bashny.Net

A group of researchers from mit have developed a new electrochemical method to quickly change the transparency of the glass. Under the influence of tension in just a few seconds it becomes dark and ceases to transmit light. And Vice versa, then in just a few seconds you can return to the original state. To maintain the transparent or opaque state no energy is required — only a change of state.

According to the authors of scientific work, this technology has the potential to save electricity in the premises, if on Sunny days the window will become opaque, it will decrease the heating of the premises and the cost of air conditioning.



Scientists say that currently there are a number of alternative methods to change the transparency of the glass, but their method differs speed and low energy consumption.

Lead author of the research paper, a chemistry Professor at the Massachusetts Institute of technology, Dinca Mircea (Mircea Dincă) explains that in creating the glass used in the electrochemical materials that change color and transparency under the influence of stress. They are radically different from photochromic material used in the well-known glasses-photochromic, which darken in the light. Photochromic materials react much more slowly and have a low degree of change in transparency. From the same limitations of existing electrochromic materials with very limited scope. For example, in the aircraft "Boeing-787" Windows made of electrochromic glass. They also darken when voltage is applied, but the process takes a few minutes. Obviously, it's too long.

Dimming glass

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Lightening glass

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The duration of the process of changing the state of electrochromic glass is that requires filling in all material positively charged ions, under the influence of which the material changes color. The ions move relatively slowly — making process is relatively long.

Chemists from the Massachusetts Institute of technology has overcome this limitation through the use of metal-organic frame structures (metal-organic framework, MOF) that allow the electrons and ions at very high speed. Such materials for decades used in industry. For example, they like a sponge able to accumulate and store large amounts of hydrogen. Use them as catalysts and for other purposes. But a group of researchers from MIT, was the first who used the optical properties of metal-organic frame structures.



The scientists were able to solve the problem of color hue dark glasses. Even the Windows in the "Boeing 787" in dark condition are actually a dark shade of green. New electrochemical glass to change its state from fully transparent to almost fully black, which consists of a mixture of green and red.

On the physical level, the material consists of two components: the organic material and metal salt. When mixed they form a film material, analogue of MOF-74, but with the ability okisliteljno-reduction processes. Depending on the use of magnesium salts or Nickel, it can be Mg2(NDISA)(H2O)2]⋅2.4(H2O) (Mg-NDISA) or [Ni2(NDISA)(H2O)2]⋅4(H2O) (Ni-NDISA).

In addition to window glass, the new material can be useful in some types of displays, which can display the image without consuming power as e-ink.

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Source: geektimes.ru/post/279446/