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Cadillac’s upcoming Celestiq flagship EV has a tint-shifting smart roof – Engadget

The flagship EV is being built to help the brand recapture its reign as “the Standard of the World.” As such, it’s expected to arrive packed to the gills with cutting…

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“SPD technology is smart glass that allows you to change the tint of the glass,” Harary explained. “There’s this film that we invented that has little nanoparticles in it, which you can control with a small electrical voltage. So, basically this film… that allows you to dial in whatever tint level you’d like.” 
“The crystals are about three to five tenths of a micron in length and they act as induced dipoles so when you apply an electric field to conductive coatings in the film,” Harary continued,…

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