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William Mong Distinguished Lecture by Professor Alexandar Navrotsky

Energetics of Nanophase Oxides - Implications for Materials, Environmental, and Earth Science

Professor Alexandra Navrotsky, an internationally renowned nanogeoscientist and a leader in thermodynamic research community; also an Interim Dean for Mathematics and Physical Sciences, and the Director for Organized Research Unit on Nanomaterials in the Environment, Agriculture and Technology (NEAT-ORU) at UC-Davis, gave a lecture on November 25, 2013 titled “Energetics of Nanophase Oxides - Implications for Materials, Environmental, and Earth Science” at Wang Gungwu Theatre, Graduate House.

The thermodynamic properties of nanomaterials are substantially changed by surface energy effects. Based on recent measurements of surface energies in the Peter A. Rock Thermochemistry Laboratory at UC-Davis, we see systematic trends in surface energies as a function of structure and composition in oxide systems. The difference in surface energy of different phase assemblages leads to large shifts in polymorphism, dehydration, and redox equilibria. With examples of titanium, tin, zirconium, iron, and manganese oxides, the effects of such thermodynamically driven changes in phase relations and water adsorption energetics on catalytic, sensing, geochemical reactions, and environmental transport are discussed.

William Mong Distinguished Lecture by Professor Alexandar Navrotsky

The University of Hong Kong Faculty of Engineering