Peltier-element-based adiabatic scanning calorimetry (pASC) for high-resolution heat capacity and enthalpy measurements
Conceptually the measurement of the temperature evolution of the specific heat capacity and enthalpy of materials is very straightforward, only involving measurement of the time dependence of the temperature of the sample and of the heating power going to or coming from the sample. In practice, attaining high absolute accuracy of heat storage measurements is often hampered due to the need of comparison with a reference sample, data processing involving baseline subtraction and slope correction, and due to the lack of thermal equilibrium in the sample as a result of a too high scanning rate. In this contribution we present how, by virtue of a dedicated way of controlling the energy flow to the sample in a Peltier element based adiabatic scanning calorimeter (pASC), an absolute accuracy of better than 2% can be obtained on the heat capacity and enthalpy of samples with masses of a few tens of mg. The pASC device also allows to perform scans at a temperature heating or cooling rate determined by the enthalpy evolution of the sample upon steady state power input, thus allowing to go through second and first phase transitions in perfect thermal equilibrium, contrary to constant rate calorimeters. Also step-scans and DSC-type constant rate scans are possible. The performance of the pASC will be demonstrated for a large variety of materials, and compared with the of state of the art differential scanning calorimeters (DSCs).
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Christ Glorieux (POC,Primary Presenter), KU Leuven, email@example.com;
Jan Thoen (Author,Co-Author), KU Leuven, firstname.lastname@example.org;
Jan Leys (Co-Author), KU Leuven, email@example.com;