Time-domain and frequency-domain differential calorimetry

Year: 1996

Authors: Ferrari C., Salvetti G., Tognoni E., Tombari E.

Autors Affiliation: Istituto di Fisica Atomica e molecolare – CNR, Via del Giardino, 7 – 56127 Pisa, Italy

Abstract: The heat capacity C-p of a sample can be considered as a frequency dependent quantity; its behaviour can reflect the dynamics of enthalpy fluctuations. In order to take into account the dynamic nature of the measured quantity, calorimetry can mimic experimental methods as those of dielectrometry, performing experiments in time domain or in frequency domain.
In this paper, an instrument is presented which is based on a calorimetric method meeting these requirements, and thus allowing to study sample dynamics of very viscous systems as glasses and some supercooled liquids. Moreover, experimental procedures permitting investigation of samples undergoing chemical and/or physical transformations by simultaneous measurements of enthalpy variation, heat capacity and, under certain conditions, thermal conductivity, are discussed.


Volume: 47 (1)      Pages from: 75  to: 85

KeyWords: Calorimetry; Enthalpy; Heat capacity; Thermal conductivity
DOI: 10.1007/BF01982687

Citations: 2
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