报告时间：2016年10月28日（星期五）15:00-16:30

报告地点：分子反应动力学A座 三楼会议室

报告人：Prof.Scott L.Anderson

Department of Chemistry, The University of Utah

　　报告简介：

    The surface chemistry of small metal nanoparticles can be substantially different than that observed for bulk metal or larger nanoparticles, due to differences in the availability of particular binding sites, and quantum confinement effects on electronic structure.  Two approaches to probing size effects will be discussed.  For very small particles, in the cluster size regime, it is practical to prepare atomically monodisperse beams of cluster ions, which we deposit on well characterized surfaces and study by surface science or electrochemical techniques.  Examples of both electronic and geometric site effects will be presented to illustrate the sorts of effects seen.

    For larger particles, with thousands-to-millions of atoms, the size selection approach becomes impractical, but single particle trapping techniques can be used instead.  A single particle is trapped, and then its mass is measured non-destructively to high precision while the particle is heated and/or exposed to gaseous reactants.  The kinetics of surface reactions can be measured with high sensitivity by tracking the mass; by carrying out measurements on a series of particles, the effects of particle size are determined.  Oxidation and sublimation chemistry of carbon nanoparticles will be used to illustrate the method.

　　报告人简介：

    Prof.Scott L.Anderson

    Distinguished Professor, Department of Chemistry, The University of Utah

　　Activities & Awards:

　　Robert W. Parry Teaching Award (2015)

　　Associate Director for Surface Analysis and Nano-imaging, Utah Nanofab (2014 - )

　　Fellow of the American Association for the Advancement of Science (2011)

　　Distinguished Scholarly and Creative Research Award (2007)

　　Fellow of the American Physical Society (2005)

　　Visiting Scientist, Inst für Physik, Univ. Chemnitz (2004)

　　Japan Society for the Promotion of Science Senior Invitation Fellowship (2002-2003)

　　Professeur Invité, Université de Paris-Sud (1990-91)

　　Visiting Scientist, Fakult？t für Physik, Freiburg (1990)

　　Camille and Henry Dreyfus Foundation Teacher-Scholar

　　Japan Society for the Promotion of Science Fellow (1989-1990)

　　Alfred P. Sloan Foundation Research Fellow (1988)

　　Member of the Nano Institute of Utah 

　　Research Interests:

    The theme of his research is nanoparticle surface chemistry, with activities in four main areas:

    Size-selected cluster deposition and size-effects on catalysis:  Effects of electronic and geometric structure and cluster-support binding on activity.

　　Effects of site size on electrocatalysis:  Inherent effect of catalytic site size, aqueous electrochemistry without air exposure, high mass activity model electrodes.

　　Single nanoparticle trapping mass spectrometry to study surface chemistry and optical properties with ppm size resolution:  Size effects, new approaches to ultra-high temperature surface chemistry, light interactions with individual particles.

    Use of surface chemistry to control size and reactivity properties of high energy density nanoparticles for fuel/propellant applications:  Reactant-assisted size reduction, air-stability via capping chemistry, effects of particle size, surface chemistry, and loading on ignition behavior.

    报告联系人：1101组 丁俊霞（9930）