Accelerated aging in ultrathin films of a molecular glass former

A. Sepúlveda, E. Leon-Gutierrez, M. Gonzalez-Silveira, C. Rodríguez-Tinoco, M. T. Clavaguera-Mora, J. Rodríguez-Viejo

Research output: Contribution to journalArticleResearchpeer-review

31 Citations (Scopus)

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 1s), we evidence a remarkable variation of the relaxation rate on decreasing film thickness from 100nm down to a 7nm thick film. Our results demonstrate that surface atoms are more efficient than bulk atoms in attaining low energy configurations within the potential energy landscape. © 2011 American Physical Society.
Original languageEnglish
Article number025901
JournalPhysical Review Letters
Volume107
DOIs
Publication statusPublished - 7 Jul 2011

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