The Department of Materials Science and Engineering welcomes you to its 2015 Spring Colloquium Series.
Location: Tech L361, 4:00pm
Nigel Browning
Pacific Northwester National Laboraroty (PNNL)
“In-Situ (S)TEM/DTEM: From High Spatial Resolution to High Temporal Resolution”
The last few years have seen a paradigm change in (scanning) transmission electron microscopy ((S)TEM) with unprecedented improvements in spatial, spectroscopic and temporal resolution being realized by aberration correctors, monochromators and pulsed photoemission sources. Spatial resolution now extends to the sub-angstrom level, spectroscopic resolution into the sub-100meV regime and temporal resolution for single shot imaging is now on the nanosecond timescale (stoboscopic imaging extends this even further to femtoseconds). The challenge now in performing experiments in an (S)TEM is to implement the in-situ capabilities that will allow both engineering and biological systems to be studied under realistic environmental conditions. Performing experiments using in-situ stages or full environmental microscopes presents numerous challenges to the traditional means of analyzing samples in an electron microscope – we are now dealing with the variability of dynamic process rather than a more straightforward static structure. In this presentation, I will discuss the recent developments in the design and implementation of in-situ stages being pursued at the Pacific Northwest National laboratory (PNNL). Examples of the use of these capabilities for the direct imaging of interfaces and defects, to identify the fundamental processes involved in nucleation and growth of nanostructures from solution, and to investigate the electrochemical processes taking place in next generation battery systems will be presented. As the in-situ stages have been designed to be incorporated into both high spatial resolution aberration corrected (S)TEM as well as into high temporal resolution Dynamic TEM (DTEM), the potential for future experiments to study fast dynamics, including those in live biological structures, will also be discussed.
Biography: Nigel Browning is currently a Laboratory Fellow and Chemical Imaging Initiative Lead at Pacific Northwest National Laboratory (PNNL). After receiving his undergraduate degree in Physics from the University of Reading, U.K. and his Ph. D. in Physics from the University of Cambridge, U.K., he joined Oak Ridge National Laboratory (ORNL) as a postdoctoral research associate in 1992. In 1995, he took a faculty position in the Department of Physics at the University of Illinois at Chicago (UIC), then moved to the Chemical Engineering and Materials Science Department at the University of California-Davis (UCD) in 2002. He also held a joint appointment in the National Center for Electron Microscopy (NCEM) at Lawrence Berkeley National Laboratory (LBNL) which he moved to Lawrence Livermore National Laboratory (LLNL) in 2005. In 2009, he also joined the Department of Molecular and Cellular Biology at UCD.
Nigel has over 20 years of experience in the development of new methods in electron microscopy for high spatial, temporal and spectroscopic resolution analysis of engineering and biological structures. His research has been supported by DOE, NSF, NIH, DOD and by industry, leading to research projects for over 30 graduate students and 29 postdoctoral research fellows. He is a Fellow of the American Association for the Advancement of Science (AAAS) and the Microscopy Society of America (MSA). He received the Burton Award from the MSA in 2002, the Coble Award from the American Ceramic Society in 2003 for the development of atomic resolution methods in scanning transmission electron microscopy (STEM) and is co-recipient of R&D 100 and Nano 50 Awards in 2008 and a Microscopy Today Innovation Award in 2010 for the development of the dynamic transmission electron microscope (DTEM). He has over 350 publications and has given over 200 invited presentations on the development and application of advanced TEM methods.
Cost: $0.00