Frequency domain calorimetry to study phase transitions and relaxation processes in condensed matter
Anno: 1998
Autori: Salvetti G., Ferrari C., Tombari E.
Affiliazione autori: IFAM-CNR, Via del Giardino 7, 56127 Pisa, Italy
Abstract: This paper describes a modulated scanning calorimeter for studying, both in the isothermal and in the temperature scanning mode, liquids and solids that are chemically stable or undergoing structural transformations. The calorimeter concurrently measures, at a temperature modulation frequency,the complex heat capacity C-p* and the enthalpy change during chemical reactions or phase transitions. The time and temperature variation of the real and the imaginary parts of C-p* provide information on the molecular relaxation processes and the mutual influence between structure and dynamics in highly viscous samples as well as the glass transition. The principles and main features of the instrument and a set of experimental tests performed are described and accuracy, sensitivity, temporal stability and reproducibility of the data are given. (C) 1998 Elsevier Science B.V.
Giornale/Rivista: THERMOCHIMICA ACTA
Volume: 316 (1) Da Pagina: 47 A: 56
Parole chiavi: Glass transition; Heat capacity; Temperature modulated DSCDOI: 10.1016/S0040-6031(98)00303-7Citazioni: 18dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-04-14Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui