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arXiv · 2204.00284

Understanding temperature modulated calorimetry through studies of a model system

Jean-Luc Garden·Michel Peyrard
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Abstract

Temperature Modulated calorimetry is widely used but still raises some fundamental questions. In this paper we study a model system as a test sample to address some of them. The model has a nontrivial spectrum of relaxation times. We investigate temperature modulated calorimetry at constant average temperature to precise the meaning of the frequency-dependent heat capacity, its relation with entropy production, and how such measurements can observe the aging of a glassy sample leading to a time-dependent heat capacity. The study of the Kovacs effect for an out-of-equilibrium system shows how temperature modulated calorimetry could contribute to the understanding of this memory effect. Then we compare measurements of standard scanning calorimetry and temperature-modulated calorimetry and show how the two methods are complementary because they do not observe the same features. While it can probe the time scales of energy transfers in a system, even in the limit of low frequency temperature modulated calorimetry does not probe some relaxation phenomena which can be measured by scanning calorimetry, as suggested by experiments with glasses.

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BibTeXRIS

Jean-Luc Garden, Michel Peyrard. 2022-04-01. Understanding temperature modulated calorimetry through studies of a model system. https://doi.org/10.1103/physreve.105.034144

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