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The HIGH TEMPERATURE AQUEOUS CHEMISTRY GROUP conducts basic and applied research involving principally experimental studies on broad classes of inorganic and organic solutes in water at high temperatures to develop an understanding of the behavior of thermodynamic properties and reaction thermodynamics to conditions to and beyond the critical temperature of water. Impacts of this research are in basic solution chemistry and geochemistry, steam generator and reactor coolant technology, geothermal energy technology, hazardous and radioactive waste disposal, and chemical processing.
Several complementary and unique capabilities have been developed over three decades for high-temperature measurements on electrolyte solutions by electrical conductivity, potentiometry, flow calorimetry and densimetry, and isopiestic methods. The development of semiempirical models to represent the complex P-T-X dependence of the excess thermodynamic properties of electrolytes and of reaction thermodynamic properties is an important parallel goal. More recent neutron scattering studies and molecular dynamics simulations are providing a molecular-level view of solvation in near-critical solutions to complement the thermodynamic information.
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