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

Química Nova

关键词: calorimeter;    excess enthalpy of solution;    binary mixture;   

DOI  :  10.1590/S0100-40422009000600050

来源: DOAJ

【 摘 要 】

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 μL. 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.

【 授权许可】

Unknown