Time-resolved thermal lens investigation of glassy dynamics in supercooled liquids: Theory and experiments - Université Claude Bernard Lyon 1 Accéder directement au contenu
Article Dans Une Revue Journal of Chemical Physics Année : 2021

Time-resolved thermal lens investigation of glassy dynamics in supercooled liquids: Theory and experiments

Résumé

This work reports results on the simultaneous spectroscopy of the specific heat and thermal expansivity of glycerol by making use of a wideband time-resolved thermal lens (TL) technique. An analytical model is presented which describes TL transients in a relaxing system subjected to impulsive laser heating. Experimentally, a set of TL waveforms, from 1 ns to 20 ms, has been recorded for a glycerol sample upon supercooling, from 300 to 200 K. The satisfactory fitting of the TL signals to the model allows the assessment of relaxation strength and relaxation frequency of the two quantities up to sub-100 MHz, extending the specific heat and thermal expansion spectroscopy by nearly three and eight decades, respectively. Fragility values, extracted from the relaxation behavior of the specific heat and the thermal expansion coefficient, are found to be similar, despite a substantial difference in relaxation strength.
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Dates et versions

hal-03327275 , version 1 (27-08-2021)

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Pengfei Zhang, Marco Gandolfi, Francesco Banfi, Christ Glorieux, Liwang Liu. Time-resolved thermal lens investigation of glassy dynamics in supercooled liquids: Theory and experiments. Journal of Chemical Physics, 2021, 155 (7), pp.074503. ⟨10.1063/5.0060310⟩. ⟨hal-03327275⟩
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