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High Temperatures and High Pressures: Brillouin Scattering Studies of Liquid H2O + CO2 Mixture

Speaker: Junfeng Qin, Postdoctoral Research Associate
Series: EEWR Brown Bag Seminars
Location: Engineering Quad E219
Date/Time: Friday, February 11, 2011, 12:00 p.m. - 1:00 p.m.

Abstract:

In this presentation, Junfengwill discuss his recently published results from his experimental work completed at State Key Lab of Superhard Material, Jilin University, China. H2O and CO2binary system is one of the most frequently encountered fluids in the Earth’s crust and mantle. Under high temperatures and pressures, he measured the physical-chemical properties of a liquid mixture, H2O+CO2,usingin situBrillouinscattering spectroscopy combing a diamond anvil cell. The sound velocity, refractive index, density, and adiabatic bulk modulus of the H2O +CO2mixture were determined under pressures up to the freezing point at 293, 453, and 575 K. It was found from the experiment that sound velocities of the liquid mixture are substantially lower than those of pure water at 575 K, but not at lower temperatures. An empirical relation of the density in terms of pressure and temperature was presented. The results show that liquid H2O + CO2mixtures are more compressible than water obtained from an existing equation of state of at 453 and 575 K.