Entropy production in temperature modulated differential scanning calorimetry

TL;DR

This paper investigates the irreversible heat exchanges in temperature modulated differential scanning calorimetry, defining a frequency-dependent complex heat capacity and linking its imaginary part to entropy production.

Contribution

It introduces a novel interpretation of dynamic heat capacity in calorimetry, connecting it to entropy production during non-equilibrium processes.

Findings

Defined a frequency-dependent complex heat capacity.

Linked the imaginary part of heat capacity to entropy creation.

Provided physical insight into non-equilibrium calorimetric measurements.

Abstract

The non-equilibrium process due to irreversible heat exchanges occurring during a temperature modulated differential scanning calorimetry experiment is investigated in detail. This enables us to define an experimental frequency dependent complex heat capacity from this calorimetric method. The physical meaning of this dynamic heat capacity is discussed. A relationship is clearly established between the imaginary part of this complex quantity and the net entropy created during the experimental time-scale.