Time: 2014.07.16 (Wednesday) 9:00 a.m.
Location: 1 floor meeting room of Energy Building 1#
Lecturer: Prof. Xiaodong Zou
Berzelii Center EXSELENT on Porous Materials and Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
Email: xzou@msk.su.se
Abstract:
Knowing the structures of porous materials is essential for understanding the properties and predicting the applications of the materials. Transmission electron microscopy and electron diffraction are among the most powerful techniques for studying crystals too small to be studied by single crystal X-ray diffraction or too complex to be studied by powder X-ray diffraction. A major drawback is that each electron microscopy (EM) image or electron diffraction (ED) pattern contains only 2D information (projection) of the material. Here I will present several EM/ED approaches to probe the 3D structures of porous materials: rotation electron diffraction (RED), 3D reconstruction from a series of high-resolution transmission electron microscopy (HRTEM) images, and electron tomography (ET). I will demonstrate the RED method on structure solution of unknown zeolites and metal-organic frameworks. I will present the study of structures and disorders in zeolites by HRTEM. Finally I will demonstrate the power of combining RED and ET for studying hierachical micro- and meso-porous structures in zeolites.
Introduction:
Xiaodong Zou is a full professor, chair of the Inorganic and Structural Chemistry Unit and deputy head of the Department of Materials and Environmental Chemistry, Stockholm University. She received her Bachelor of Science in Physics 1984 at Peking University and Master of Science in Metal Physics 1986 at Beijing University of Technology, under the supervision of Prof. K.H. Kuo. In 1987 she moved to Sweden to pursue her Ph.D. study and received her PhD in structural chemistry at Stockholm University in 1995. She carried out her postdoctoral research at Lund University, working with the Tage Erlander Professor David R. Veblen from John Hopkins University, USA. She joined the faculty at Stockholm University in 1996 and became professor 2005.
One of her main research interests is method development for accurate atomic structure determination of nano-sized crystals by electron crystallography. Her group has solved a number of complex structures of zeolites and mesoporous crystals by transmission electron microscopy. She is also working on synthesis, structure determination, topology analysis and applications of inorganic open-framework materials and metal-organic frameworks. In 2006, she received 100 MSEK from the governmental funding agencies VR and VINNOVA and built up the Berzelii Center EXSELENT on Porous Materials and was the director 2006-2012. She received several awards including Tage Erlander Prize for Science and Technology 2002 and G？ran Gustafsson Prize in Chemistry 2008, both given by the Royal Swedish Academy of Sciences, the K.H. Kuo Award for Distinguished Scientist 2010 and the Arrhenius-plaketten 2012 given by the Swedish Chemical Society. She is the Member of the Structure Commission of International Zeolite Association and the Editor of Zeitschrift für Kristallographi.