Heat capacity of mixtures of clay and salt solutions for their use in thalassotherapy


C. Gómez1, J. Legido1, L. Casás1, F. Plantier2 and D. Bessières2

1Departament of Applied Physics, Faculty of Science, University of Vigo, Vigo, Spain
2Laboratoire des Fluides Complexes et leurs Réservoirs - UMR 5150, Université de Pau et des Pays de l’Adour, Pau, France

Keywords: peloids
property: heat capacity
material: salt solution, clay

The thermal peloids, as mixtures of clay and salt solutions, are used for therapeutic treatment in many centers of thalassotherapy. These products are naturally formed by mixing sea water or brackish lakes with clay components. For quite some time these mixtures were applied for therapeutic purposes; an example is the Dead Sea mud.

Thermophysical properties of these materials are of great importance for their application and their therapeutic characteristics. Density, viscosity, thermal conductivity and heat capacity make these products different. The heat capacity is of high interest in thermotherapeutic applications.

In previous works we have studied thermal properties of thermal products [1,2]. In the present one, we provide the heat capacity of different mixtures of clay and salt solutions at different temperatures.

The experimental data were measured using a Calvet calorimeter, SETARAM BT 2.15, which permits studying with high precision all kind of substances and materials (oils, polymers, hydrates, powders) and simulate almost any process condition (reactions, crystallisation, freezing...). The calibration of this device was performed in a previous work [3] in the temperature range [253.15-333.15 K], at various pressures, using two calibrating substances: n-hexane and n-heptane.

References
  1. J.M. Ortiz de Zárate, J.L. Hita, M. Khayet, J.L. Legido, Applied Clay Science. 50, 423- 426 (2010)

  2. J.L. Legido, C. Medina, M.L. Mourelle, I. Carretero, M. Pozo, Applied Clay Science. 36, 148- 160 (2007)

  3. L.M. Casás, F. Plantier, M.M. Piñeiro, J.L. Legido, D. Bessières, Thermochimica Acta. 507-508, 123- 126 (2010)

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