Accelerated Aging in Ultrathin Films of a Molecular Glass Former

TitleAccelerated Aging in Ultrathin Films of a Molecular Glass Former
Publication TypeJournal Article
Year of Publication2011
AuthorsSepúlveda, A, Leon-Gutierrez, E, Gonzalez-Silveira, M, Rodríguez-Tinoco, C, Clavaguera-Mora, MT, Rodríguez-Viejo, J
JournalPhysical Review Letters
Volume107
Start Page025901
Abstract

We report the thermodynamic measurement of the enthalpy released during the aging of supported films of a molecular glass former, toluene, at temperatures well below the glass transition temperature. By using microfabricated devices with very short equilibration times (below 1 s), we evidence a remarkable variation of the relaxation rate on decreasing film thickness from 100 nm down to a 7 nm thick film. Our results demonstrate that surface atoms are more efficient than bulk atoms in attaining low energy configurations within the potential energy landscape.

URLhttp://link.aps.org/doi/10.1103/PhysRevLett.107.025901
DOI10.1103/PhysRevLett.107.025901
Short TitlePhys. Rev. Lett. 107, 025901 (2011)
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