photochromic painting1 (polymer).AVI

A special polymer film containing the fast photochromic molecules.
Photochromic molecules change their color upon irradiation with light. The photogenerated state of a photochromic molecule can switch back to the original state either thermally, once irradiation is terminated, or photochemically, upon illumination with a specific wavelength of light.
Prof. Jiro Abe of Aoyama Gakuin University recently developed a photochromic [2.2]PC-bridged imidazole dimer, with a [2.2]paracyclophane ([2.2]PC) moiety that couples two diphenylimidazole (DPI) groups, that shows instantaneous coloration upon exposure to UV light and rapid fading in the dark.
http://news.sciencemag.org/sciencenow/2009/04/24-01.html
http://www.wired.com/wiredscience/2008/06/video-amazing-l/
J. Am. Chem. Soc., 2009, 131 (12), pp 4227?4229
DOI: 10.1021/ja810032t

Category:

Science & Technology

Tags:

• photochromic
• painting1
• polymer

[lekunberriko1]

Please, could you tell me what light is it?

[PHOTOCHROMISM]

@lekunberriko1 UV light irradiation was performed by a UV-LED (Keyence UV-400) , which is commercially available from Japanese company.

[diviz0r]

somehow this reminds me off invisible ink. lemon juice on paper is clear but once held under fire or warmth it turns brown.