Topic：Scale-dependent rates of geochemical and biogeochemical reactions in subsurface porous media

Speaker： Dr. LIU, Chongxuan

Chief Scientist, Geochemistry Group, Chemical and Material Science Division, Fundamental and Computational Science Directorate, Pacific Northwest National Laboratory (PNNL)

Dr. Liu majored in Environmental Engineering and Chemistry and got his Ph.D from Johns Hopkins University, USA. His research area is in geochemistry and biogeochemistry in subsurface environments. His researches focus on molecular and microscopic understanding of geochemical and biogeochemical reactions, and mass transfer processes of solute, fluid, and contaminants through both theoretical and experimental investigations. His major research accomplishments that have significant impact to topical sciences include: 1) derivation of rate-laws for microbially mediated redox reaction kinetics based on bacterial energetics and membrane-associated electron transport mechanism for dissimilatory microbial reduction of iron and manganese oxides, and groundwater contaminants such as chromium, uranium, and technetate; 2) establishment of thermodynamic and kinetic expressions for adsorption/desorption of solute and metal contaminants in mineralogically complex sediments; and 3) development of fundamental theory governing diffusive transport of ions in electrolytes in porous media with nano-sized pores, pore surface charges, and pore connectivity that are relevant to microporous domains in bacterial membranes, plant roots, and sediment grains with intragrain and intra-aggregate pores. His recent research areas are: 1) microfluidics involving coupled flow, diffusive mass transfer, and geochemical and biogeochemical reactions in development and maintenance of microenvironments that exert dynamic influence on the fate and transport of solute, CO2, and contaminants in subsurface environments; 2) theoretical and experimental investigation on the scaling of physical, and coupled physical and biogeochemical processes from molecular to macroscopic scales; 3) field-scale investigation of contaminant fate and transport in heterogeneous sediments; and 4) interactions of engineered nanoporous particles (ENP) with sediments and ENP reactive transport. Most of his research results have been published on the journal of “Environmental Science & Technology”, “Chemical Geology”, “Geochimica et Cosmochimica Acta”, “Journal of Contaminant Hydrology”, “Chemosphere” etc.

Time：9:30 AM July 12, 2010

 Venue：Room 411, Geographic Sciences Museum, IGSNRR

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