Organic glasses with exceptional thermodynamic and kinetic stability

TitleOrganic glasses with exceptional thermodynamic and kinetic stability
Publication TypeJournal Article
Year of Publication2007
AuthorsSwallen, S. F., K. L. Kearns, M. K. Mapes, Y. S. Kim, R. J. McMahon, M. D. Ediger, T. Wu, L. Yu, and S. Satija
JournalScience
Volume315
Pagination353-356
ISBN Number0036-8075
Accession NumberWOS:000243535400034
KeywordsAROMATIC HYDROCARBONS, FORMERS, HEAT-CAPACITY, PARADOX, PHYSICAL PROPERTIES, STRUCTURAL RELAXATION, SUPERCOOLED LIQUIDS, TEMPERATURE, TRANSITION
Abstract

Vapor deposition has been used to create glassy materials with extraordinary thermodynamic and kinetic stability and high density. For glasses prepared from indomethacin or 1,3-bis-(1-naphthyl)-5(2-naphthyl) benzene, stability is optimized when deposition occurs on substrates at a temperature of 50 K below the conventional glass transition temperature. We attribute the substantial improvement in thermodynamic and kinetic properties to enhanced mobility within a few nanometers of the glass surface during deposition. This technique provides an efficient means of producing glassy materials that are low on the energy landscape and could affect technologies such as amorphous pharmaceuticals.

DOI10.1126/science.1135795