报告人： Professor You Qiang
Department of Physics and Environment Science Program,
University of Idaho, Moscow, ID 83844-0903
题目：Nano-Watermelon: synthesis, nanomagnetism and applications
Understanding the fundamental physics of antiferromagnetic - ferromagnetic interactions is essential to apply in different applications. Chromium (Cr) doped and undoped core-shell iron/iron-oxide NPs have been synthesized using cluster deposition system and investigated with respect to their nanostructures, morphologies, sizes, chemical composition and magnetic properties. The room-temperature magnetic properties of Fe based NPs shows the strong dependence of intra/inter-particle interaction on NP size, and interaction reversal from dipolar to exchange interaction. A theoretical model of watermelon NPs is constructed based on the experimental results and core-shell NP system in order to explain the physics of exchange interaction in magnetic nanoparticles. This type of MNPs has been used for spent nuclear fuel recycling, cancer treatment and environmental remediation.
Dr. You Qiang is a professor of physics and adjunct professor in the Environmental Science program at the University of Idaho, US. He was a chairman of Idaho Academy of Science (2012-2014). He received his MS degree at the Harbin Institute of Technology and Chinese Academy of Space Technology, China in 1985, and a Ph.D. degree 1997 at the University of Freiburg, Germany. He was a research faculty at the University of Nebraska-Lincoln from 1999 to 2002. Dr. Qiang’s research focuses on magnetism and magnetic nanomaterials. He has studied magnetic nanoparticles and nanocomposites for more than 30 years. His expertise includes: synthesis of monodispersive nanoclusters and nanocluster-assembled composites; characterization of magnetic and optical properties as well as transport properties by conductivity, optics, susceptibility and theoretical investigation of magnetic nanoparticle interactions. He applied magnetic nanoparticles in energy, environmental and biomedical science and nanotechnology. Presently Dr. Qiang’s research interests are a) Magnetic separation nanotechnology for used nuclear fuel recycling; b) High temperature ferromagnetism and giant magnetoresistance of semiconductor oxide nanomaterials for spintronics; and c) Iron-based magnetic nanoparticles for cancer treatment and environmental remediation. He has published more than 100 refereed papers and 4 book chapters, more than 100 invited talks at national and international conferences, universities and institutions, and served on national and international conference organizations and committees, including MRS, CleanTech, NanoTech and IMC. He organized and chaired conferences and sessions for INTERMAG, MMM, APS and NW-APS meetings.