DOS Engineering for New Green Nano-materials
发布人: 星禧   发布时间: 2018-11-30    浏览次数:

主讲人简历:  Kitagawa Hiroshi received his Ph.D. in science from Kyoto university (1992). After work as a research associate at Institute for Molecular Science (IMS) (1991-1994) andJapan Advanced Institute of Science & Technology (JAIST) (1994-2000), he worked as an associate professor at University of Tsukuba (2000-2003). Then, he worked as a full professor in Kyushu University (2003-2009). From 2009, he moved to Kyoto University and worked as a full professor in division of chemistry. Dr. Kitagawa is also deputy executive vice-president for strategy coordination and vice provost of Kyoto University.Dr. Kitagawa is a famous scientist in solid-state chemistry, coordination chemistry, inorganic chemistry, nano science. His current research interests includes solid-state protonics using MOFs and surMOFs, and nano-ionics using nanomaterials,creation of novel solid-solution alloy nanoparticles on the basis of density-of-states engineering by interelement,low-dimensional electron systems situated on dimensional crossover region, molecular conductors and conducting MOFs.

讲座介绍:  The property of element is correlated directly with its electron configuration. In a solid, the density of states (DOS) at the Fermi level affects the physical and chemical properties. The method of alloying elements has been used to improve the properties of materials for many years. In particular, the solid-solution-type alloy is advantageous because tuning the compositions and/or combinations of the constituent elements can continuously control the properties. However, the majority of bulk alloys are of the phase-separated type under ambient conditions, where constituent elements are immiscible with each other. To overcome the challenge of the bulk-phase metallurgical aspects, we have focused on the nanosize effect and developed methods involving “non-equilibrium synthesis” or “a process of hydrogen absorption/desorption”. We propose a new concept of “density-of-states engineering” for the design of materials having the most desirable and suitable properties by means of “interelement fusion”. Novel solid-solution alloys of Pd-Pt, Ag-Rh, and Pd-Ru systems in which the constituent elements are immiscible in the bulk state are presented and discussed. Our present work provides a guiding principle for the design of a suitable DOS shape according to the intended physical and/or chemical properties and a method for the development of novel solid-solution alloys.