Heat Capacity and Heat Conductivity of Aqueous Solutions
of Calcium Chloride in Silica Gel Pores

Yu. I. Aristov*, M. M. Tokarev*, G. Cacciola**, and G. Restuccia**

* Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, pr. akademika Lavrent’eva 5,
Novosibirsk, 630090 Russia
** Istituto di trasformazione e accumulazione d’energia, Messina, 98126 Italy

Received September 5, 1995

Abstract—The heat capacity and heat conductivity of the CaCl₂-H₂O system in pores of KSKG silica gel were
studied. The heat capacity was calorimetrically determined as a function of temperature (308–378 K) and water
content (weight fraction 0–0.3). Analytical expressions describing these dependences were obtained. The heat
capacity of the material can satisfactorily be represented as the sum of the heat capacities of the components.
The heat conductivity was measured by the “hot wire” method for water contents in the range w = 0.35–0.75 at
temperatures t = 20–23°C. At low water contents (w < 0.4), the heat conductivity changed insignificantly, from 0.33
to 0.36 W/(m K). Increasing w above 0.4 resulted in a rapid growth of the heat conductivity to 0.5–0.55 W/(m K). It
was found that dispersing the CaCl₂-H₂O system in silica gel pores had only a weak effect on the heat capacity
and conductivity of the material.

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