Time: 30th November, 2017, 9:30-11:00 am
Venue: Conference Room on first floor of Basic Energy Building
Lecturer: Dr. Thomas Willum Hansen, Technical University of Denmark
Recent advances in MEMS based instrumentation for transmission electron microscopy has paved the way for in situ investigation of materials with unprecedented spatial resolution under high pressures and elevated temperatures. Combined with traditional differentially pumped environmental TEMs, researchers can investigate phenomena such as the melting of nanoparticles, growth of individual graphene layers, nanowire and nanotube growth and surface structure of catalytic materials exposed to pressures in the range spanning from 10-8 Pa to atmospheric pressure all at a resolution in the Ångstrøm regime. Here, we have modelled the melting point of platinum nanoparticles using molecular dynamics as a function of nanoparticle diameter using molecular dynamics simulations performed in the Atomic Simulation Environment (ASE) in combination with the ASAP package.
Thomas is the senior scientist at the Center for Electron Nanoscopy, Technical University of Denmark. His main research field revolves around nanoparticles and heterogeneous catalysis, electrocatalysis and photocatalysis with emphasis on morphology, dynamic phenomena, interfaces and surfaces. The main tools are high-resolution transmission electron microscopy, scanning transmission electron microscopy and scanning electron microscopy for spatial characterization along with energy-dispersive X-ray spectroscopy and electron energy-loss spectroscopy for chemical characterization. In particular, the use of these techniques for in situ characterization in the presence of gases at elevated temperatures. Up to now, he has published more than 75 scientific papers in international refereed journals, with more than 1400 citations and an h-index of 21 (Web of Science).
Contact: XU Zhao, DNL2002