Show simple item record

dc.contributor.authorEdiger, Mark
dc.contributor.authorDalal, Shakeel
dc.contributor.authorQiu, Yue
dc.date.accessioned2018-09-10T14:26:31Z
dc.date.available2018-09-10T14:26:31Z
dc.date.issued2018-03-25
dc.identifier.citationSoft Matter, 2018, 14, 2827en
dc.identifier.urihttp://digital.library.wisc.edu/1793/78693
dc.description.abstractPhotochemically stable solids are in demand for applications in organic electronics. Previous work has established the importance of the molecular packing environment by demonstrating that different crystal polymorphs of the same compound react at different rates when illuminated. Here we show, for the first time, that different amorphous packing arrangements of the same compound photodegrade at different rates. For these experiments, we utilize the ability of physical vapor deposition to prepare glasses with an unprecedented range of densities and kinetic stabilities. Indomethacin, a pharmaceutical molecule that can undergo photodecarboxylation when irradiated by UV light, is studied as a model system. Photodegradation is assessed through light-induced changes in the mass of glassy thin films due to the loss of CO2, as measured by a quartz crystal microbalance (QCM). Glasses prepared by physical vapor deposition degraded more slowly under UV illumination than did the liquid-cooled glass, with the difference as large as a factor of 2. Resistance to photodegradation correlated with glass density, with the vapor-deposited glasses being up to 1.3% more dense than the liquid-cooled glass. High density glasses apparently limit the local structural changes required for photodegradation.en
dc.description.sponsorshipUS Department of Energyen
dc.language.isoen_USen
dc.publisherSoft Matteren
dc.subjectphotostability, organic glassesen
dc.titleVapor-deposited Organic Glasses Exhibit Enhanced Stability Against Photodegradationen
dc.typeArticleen
dc.identifier.doi10.1039/c8sm00183a


Files in this item

Thumbnail
Thumbnail
Thumbnail
Thumbnail
Thumbnail
Thumbnail
Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record