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The effect of volatiles on the measurement of the reaction heat by differential scanning calorimetry
García Cano, Eduard; Sánchez-Rodríguez, Daniel; López-Olmedo, Joan Pere; Farjas Silva, Jordi; Roura Grabulosa, Pere
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
This work was partially funded by the Spanish Programa Nacional de Materiales through projects MAT2011-28874-C02-02 and by the Generalitat de Catalunya contract No. 2009SGR185
Calorimetria
Calorimetry
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Springer Verlag
         

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