TY - JOUR
T1 - Accelerated aging in ultrathin films of a molecular glass former
AU - Sepúlveda, A.
AU - Leon-Gutierrez, E.
AU - Gonzalez-Silveira, M.
AU - Rodríguez-Tinoco, C.
AU - Clavaguera-Mora, M. T.
AU - Rodríguez-Viejo, J.
PY - 2011/7/7
Y1 - 2011/7/7
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevLett.107.025901
DO - 10.1103/PhysRevLett.107.025901
M3 - Article
SN - 0031-9007
VL - 107
JO - Physical Review Letters
JF - Physical Review Letters
M1 - 025901
ER -