Organic Glasses with Exceptional Thermodynamic and Kinetic Stability

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...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2007-01, Vol.315 (5810), p.353-356
Main Authors: Swallen, Stephen F, Kearns, Kenneth L, Mapes, Marie K, Kim, Yong Seol, McMahon, Robert J, Ediger, M.D, Wu, Tian, Yu, Lian, Satija, Sushil
Format: Article
Language:English
Subjects:
Amorphous materials
Calorimetry, Differential Scanning
Chemical Phenomena
Chemistry, Physical
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Deposition
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Glass
Glass transitions
Glassy
Indomethacin - chemistry
Kinetics
Landscapes
Liquids
Materials
Materials science
Methods of deposition of films and coatings
film growth and epitaxy
Molecules
Naphthalenes - chemistry
Organic chemistry
Phase Transition
Physics
Reflectance
Specific phase transitions
Stability
Thermodynamics
Thin film deposition
Transition Temperature
Vapor deposition
Vapor phase epitaxy
growth from vapor phase
Vapors
Volatilization
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Summary: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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1135795