Abstract
A novel flow calorimeter cell has been designed to allow insertion of soluble solids into the stream of the flowing solvent fluid. Only small amounts (∼1 mg) of solid material are required. A model of the flow cell has been constructed for use within a Tian–Calvet microcalorimeter. Effective thermal equilibrium of the flowing fluid is achieved by a counterflow technique developed by Gill, Nichols, and Wadsö in a similar system for study of heats of slightly soluble liquids. A precision of 1–2% is obtained by measurements of the heat of solution for diketopiperazine and several purine and pyrimidine compounds at 25 and 40 °C.
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