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American Chemical Society's Weekly PressPac -- April 22, 2009
Date:4/26/2009

that photochromic materials are most familiar as the invisible layers found in the lenses of many high-end sunglasses, which change color when exposed to sunlight. For years, researchers have explored the possibility of using these unusual materials for optical data storage in computers and as "molecular switches" for more controlled drug delivery. Conventional photochromic materials, however, tend to be relatively slow-acting (tens of seconds to hours) and unstable, which prevents their use for many advanced applications, the scientists say.

The scientists describe development of a unique photochromic material that shows instantaneous coloration upon exposure to ultraviolet light and its disappearance within tens of milliseconds when the light is turned off. The decoloration speed is thousands of times faster than conventional materials. The material is also more stable and longer-lasting, they note. In laboratory studies, the scientists showed that the new material could instantly change from colorless to blue in both solid form and in solution when they exposed the molecules to ultraviolet light, and quickly back to colorless when the light is turned off. The development opens the door to futuristic technologies "with unprecedented switching speeds and remarkable stabilities," the article notes. - MTS

ARTICLE #4
"A Fast Photochromic Molecule That Colors Only under UV Light"

DOWNLOAD FULL TEXT ARTICLE: http://pubs.acs.org/stoken/presspac/presspac/full/10.1021/ja810032t

PHOTOCHROMIC MATERIAL VIDEO - ja810032t_weo_001.avi: http://web.1.c2.audiovideoweb.com/1c2web3536/PHOTOCHROMIC_MATERIAL_VIDEO-ja810032t_weo_001.avi

CONTACT:
Jiro Abe, Ph.D.
Aoyama Gakuin University
Department of Chemistry
School of Science
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Contact: Michael Woods
m_woods@acs.org
202-872-6293
American Chemical Society
Source:Eurekalert  

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