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Title

The effect of volatiles on the measurement of the reaction heat by differential scanning calorimetry.

Authors

García, Eduard; Sánchez-Rodríguez, Daniel; López-Olmedo, Joan; Farjas, Jordi; Roura, Pere

Abstract

When gases evolve during a chemical reaction, a fraction of the reaction heat is lost with them. We have analyzed, both theoretically and experimentally, the deviations that this effect can produce on the determination of the reaction heat by differential scanning calorimetry (DSC). It is shown that, even in the absence of gas overheating, deviations related to variations in the sample heat capacity can be substantial in experiments involving very intense DSC peaks. However, experiments performed on thermal decomposition of metal organic salts and on evaporation of liquids have shown that deviations usually arise from gas overheating.

Subjects

EVAPORATION (Chemistry); CHEMICAL reactions; DIFFERENTIAL scanning calorimetry; CHEMICAL kinetics; HEAT capacity of solids

Publication

Journal of Thermal Analysis & Calorimetry, 2015, Vol 121, Issue 1, p187

ISSN

1388-6150

Publication type

Academic Journal

DOI

10.1007/s10973-015-4465-8

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