Materials Science

Stabilized dyes as dense glasses

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Science  23 Sep 2016:
Vol. 353, Issue 6306, pp. 1378-1379
DOI: 10.1126/science.353.6306.1378-f

The photostability of organic dyes can vary greatly between different crystalline polymorphs (packing arrangements), but similar effects have not been observed in amorphous or glassy materials. Qiu et al. studied the photostability of a common azobenzone dye (Disperse Orange 37), which can undergo photoisomerization, at different glass densities. Photostability was increased by a factor of 50 in glasses formed through physical vapor deposition on a substrate, relative to less dense glasses that formed simply by cooling the liquid. The highest photostability was observed for the densest vapor-deposited glass, which formed at substrate temperature of 260 K.

J. Am. Chem. Soc. 10.1021/jacs.6b06372 (2016).

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