Temperature Modulated Differential Scanning Calorimetry Part IV. Effect of heat transfer on the measurement of heat capacity using quasi-isothermal ADSC |
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Authors: | Jiang Z Imrie C T Hutchinson J M |
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Institution: | (1) Department of Chemistry, University of Aberdeen, Aberdeen, AB24 3UE, UK;(2) Department of Engineering, University of Aberdeen, Aberdeen, AB24 3UE, UK |
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Abstract: | An analysis developed in previous work has been further refined in order to study the effect of heat transfer on the heat
capacity and phase angle measurements by TMDSC. In the present model, a temperature gradient within the sample has been taken
into account by allowing for heat transfer by thermal conduction within the sample. The influence of the properties of the
sensors, the heat transfer conditions between the sensor and sample,and the properties of the sample have been investigated
by varying each parameter in turn. The results show that heat capacity measurements are reliable only within a restricted
frequency range, for which the experimental conditions are such that the heat transfer phase angle depends linearly on the
modulation frequency.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | complex heat capacity heat transfer phase angle TMDSC |
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