Next-Gen

Automatic Sunglasses

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by christophernavery
Last updated 2 years ago

Discipline:
World Languages
Subject:
French
Grade:
12

Test Glog

Automatic Sunglasses

The Basics

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Chemistry Involved

Plastic Lenses

Sources

http://cen.acs.org/articles/87/i15/Self-Darkening-Eyeglasses.htmlhttp://makahiki.kcc.hawaii.edu/chem/everyday_photo_oxid.htmlhttp://www.eyekit.co/information/lenses/what-are-photochromic-lenses.html

2 types-glass and plastic: Glass lenses use AgCl Plastic lenses use organic dyesTemperature dependency: Clears slower when cold Darkens slower when hot

AgCl and CuCl are mixed in glass during production. When glasses are exposed to UV, electron is transfered from Ag+ to Cl- to form clusters of silver atoms that absorb more visible light than AgCl. In the absence of UV an electron is tranfered from the Cu+ to the Cl to form Cu2+ and Cl-, then another electron is transfered from the Ag to the Cu2+ to form Cu+ and Ag+ leaving the glass with the transparent AgCl and CuCl microcrystals.

Chemistry Involved

Glass Lenses

Naphthopyran dye coated on the surface. When exposed to UV a chemical bond is broken and the molecule rearranges itself into a species that aborbs more light

Glass is more durable Plastic transitions fasterLens will not change in cars


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