Accelerated aging in ultrathin films of a molecular glass former |
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Authors: | Sepúlveda A Leon-Gutierrez E Gonzalez-Silveira M Rodríguez-Tinoco C Clavaguera-Mora M T Rodríguez-Viejo J |
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Institution: | Nanomaterials and Microsystems Group, Physics Department, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain. |
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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. |
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