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Materials Science at Oregon State University

Advancing Scanning Transmission Electron Microscopy for Materials Characterization - PLEASE NOTE - Seminar is on WEDNESDAY at 10 AM in Rogers 226

Date: Wednesday, Feb 26th
Presenter: Dr. Jinwoo Hwang, University of California, Santa Barbara

Abstract


Development of new multi-scale characterization tools and techniques is critical for the design and synthesis of future materials. Within the last decade, instrumentation for (scanning) transmission electron microscopy (S/TEM) has made tremendous progress. The next phase is to utilize these advances to solve the eminent materials problems of today. This requires the development of S/TEM techniques that can achieve, for example, atomic scale 3D information, variable resolution, high precision, and atomic scale analysis of non-crystalline or soft materials, including biological systems. I will present recent advances in developing novel S/TEM techniques that allow for understanding the structural origins of materials functionality and dynamics from atomic to meso scale, in several representative materials systems. These new techniques include quantitative S/TEM for atomic scale 3D imaging of dopants, position averaged convergent beam electron diffraction for functional oxides, and electron nanodiffraction and fluctuation microscopy for non-crystalline and soft materials. Combined with in-situ conditions, and data prediction, and analysis based on advanced computational simulations, these novel techniques provide powerful tools for the structural determination of future materials beyond current limitations.

Biography:
Jinwoo Hwang received his Ph.D. from the University of Wisconsin, Madison in 2011. He is currently a postdoctoral researcher at the University of California, Santa Barbara. His research interests include advanced structural characterization of materials, S/TEM technique development, and computational materials modeling. In particular, he has developed novel S/TEM techniques and simulation methods based on electron nanodiffraction and quantitative imaging, for nanostructured materials, oxide heterostructures, and non-crystalline materials. For his contributions to the field, he has received several honors and awards, including a best postdoctoral paper award from the Microscopy and Microanalysis Society in 2013.