Prof. Choong-Shik Yoo [Washington State University, USA]

  Series Lecture V  

Title: Dynamic Response of Solids: Time-resolved x-ray and spectroscopic studies

Time: 10:00 - 11:00 AM, Thursday, May 26, 2016

Place: Auditorium Room 410, Building 6, HPSTAR (Shanghai)

Host: Dr. Ho-Kwang Mao

Abstract:

Transition metals with high oxygen affinities such as Zr, Ti and Fe can rapidly react with oxygen at high temperatures, yielding a wide range of transition metal oxides. These highly exothermic, self-fueling metal oxidation reactions (or metal combustions) are complex and strongly depend on microstructures, crystal structures, melting temperatures, and oxygen diffusivities of metals and metal oxides.  In this talk, I will describe our recent developments of time-resolved (TR) x-ray diffraction and TR spectroscopic/microscopic methods, capable of probing the time-evolution of crystal structures and chemical species of solids, subjected to thermal and mechanical ignitions and undergoing metal combustions and metathesis reactions.

Biography of the Speaker:

Choong-Shik Yoo is a Professor in the Department of Chemistry and in the internationally recognized WSU Institute for Shock Physics. Prior to his arrival at WSU, he worked for nearly 20 years at the Lawrence Livermore National Laboratory where he developed and led a large multi-disciplinary research group in High Pressure Physics. Professor Yoo received his Ph.D in Physical Chemistry in 1986 from UCLA. His research expertise is on novel materials research under extreme environments of pressure, temperature, and chemical composition. His work has utilized static and dynamic high-pressure capabilities coupled with the state-of-the-art laser spectroscopic methods and x-ray diffraction and spectroscopy at the national synchrotron facilities. Dr. Yoo’s current research studies focus on energetic materials and processes, as well as developments of novel high energy density materials, reactive materials, wear-resistive super hard materials, and novel functional nanocomposites and intermetallics. Professor Yoo twice earned the DOE awards (1995 and 2006), for Excellence in Weapons Materials Research. He currently serves as the US Regional Editor for High Pressure Research and is a member of American Chemical Society, American Physical Society, American Geophysics Union, Materials Research Society, and Three Materials Society.