Construção de um calorímetro isotérmico diferencial de alta sensibilidade e baixo custo Construction of a differential isothermal calorimeter of high sensitivity and low cost

• Main Authors: Rafael Bergamo Trinca, Carlos Eduardo Perles, Pedro Luiz Onófrio Volpe
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2009-01-01
• Series: Química Nova
• Subjects: calorimeter; excess enthalpy of solution; binary mixture
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422009000600050

<abstract language="eng">The high cost of sensitivity commercial calorimeters may represent an obstacle for many calorimetric research groups. This work describes the construction and calibration of a batch differential heat conduction calorimeter with sample cells volumes of about 400 &#956;L. The calorimeter was built using two small high sensibility square Peltier thermoelectric sensors and the total cost was estimated to be about US$ 500. The calorimeter was used to study the excess enthalpy of solution of binary mixtures of liquids, as a function of composition, for the following binary systems of solvents: water + 1,4-dioxane or + dimethylsulfoxide at 298,2 ± 0,5 K.