Tuesday, 10 September 2019

Photochromic Glass


Photochromic glass is glass that changes color when exposed to radiation. For example, spectacles with glasses, which darken when illuminated, and again become colorless in the absence of intense illumination, are now widespread. Such glasses are used to protect highly glazed buildings from the sun and to maintain constant illumination of rooms, as well as in transport.
 
Photochromic Lenses for Glasses
Photochromic Lenses for Glasses
Photochromic glasses contain B2O3 boron oxide and the light-sensitive component is AgCl silver chloride in the presence of copper (I) Cu2O oxide. When lighting, the process occurs:


AgCl + [hν (light)] → Ag0 + Cl0

The release of atomic silver leads to darkening of the glass. In the dark, the reaction proceeds in the opposite direction. Copper oxide (I) plays the role of a kind of catalyst.

Smart (Electrochromic) Glass
Smart (Electrochromic) Glass
With intense irradiation of glass (including laboratory) with γ-rays, neutrons, and to a lesser extent α- and β-rays, glass also stains (most often in dark and black colors). This is due to a change in the structure of glass and the formation of ions, which play the role of “color centers”. When the glass is heated to temperatures close to the softening temperature, the color disappears. Sometimes such glasses are used as dosimeters of large doses of radiation.

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