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
Start Page025901

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.

Short TitlePhys. Rev. Lett. 107, 025901 (2011)
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