[CCoE Notice] Seminar: From Atomic-Scale Ordering to Materials Properties: Aberration-Corrected Imaging, * CBB 108 * 10:30 am, Friday, April 12, 2019 * David W. McComb * The Ohio State University *

[Knudsen, Rachel W]

***** Seminar *****
Department of Electrical and Computer Engineering
Materials Engineering Program
Center for Integrated Bio and Nano Systems
  April 12, 2019
10:30 a.m., Room: CBB 108
>From Atomic-Scale Ordering to Materials Properties: Aberration-Corrected Imaging,
Spectroscopy, and Simulation
David W. McComb
Center for Electron Microscopy and Analysis, Dept. of Materials Science and Engineering
The Ohio State University
Abstract: Understanding structure-property relationships is at the heart of materials science and engineering. The ability to characterize how atomic-scale structure and composition affect macro-scale properties allows new materials to be engineered more effectively and efficiently. There are few places in the world that can rival the Center for Electron Microscopy and Analysis (CEMAS) at The Ohio State University (OSU) in advanced materials characterization capabilities – it is arguably the best microscopy facility in the world. The unique building design and infrastructure ensure optimum instrument performance. The physical infrastructure is further supported by an impressive intellectual foundation of faculty and staff with expertise that spans all aspects of electron and ion beam instrumentation. CEMAS is constantly evolving, not only installing new instruments and bringing new capabilities into the facility, but also continuing work in close partnership with instrument manufacturers to develop new detectors and techniques. At CEMAS, we bring together multidisciplinary expertise to drive synergy and amplify our characterization capabilities, to challenge what is possible in electron microscopy. In this lecture I will present an overview of the Center for Electron Microscopy and Analysis (CEMAS) and will show how we are pushing the limits of analytical techniques such as X-ray energy-dispersive spectroscopy (XEDS) and electron energy-loss spectroscopy (EELS) in the scanning transmission electron microscope (STEM) to determine composition and bonding on the atomic scale. Using examples from our recent work on Ni-based superalloys, complex double perovskite materials for spintronics and organic materials for photovoltaic applications, I will discuss how our data is providing new insights into structure-property relationships. I will also discuss the importance of image and spectral simulation to avoid potentially misleading interpretation of “atomically-resolved” compositional maps.
Bio: Professor David McComb is the Director of the Center for Electron Microscopy and Analysis (CEMAS), an Ohio Research Scholar and Professor of Materials Science and Engineering at The Ohio State University.  A chemistry graduate from the University of Glasgow, David completed his PhD in Physics at the University of Cambridge.  David is an expert in the development and application of electron energy-loss spectroscopy (EELS) as a sub-nanometer scale probe of chemistry, structure and bonding.  He has extensive experience in the application of EELS to the study of problems in solid-state chemistry and materials science including structural and compositional variations in high-k oxides, short range magnetic order in transition metal oxides, interfaces in fuel cells, photovoltaics, multiferroics and biomaterials. In recent years he has focused his attention on developing and implementing approaches to studying organic and molecular systems using these methods.  He has demonstrated that these methods can be used to obtain unique insights into materials such on polymers for organic photovoltaics, biomineralized tissues, amyloid plaques, wear particles in macrophage cells associated with metal hip implants, molecular fragments associated with degradation of carbon nanotubes in cells and mechanisms for early stage mineralization processes.  He is a fellow of the Royal Society of Chemistry and the Institute of Materials, and until recently was co-director of the London Centre for Nanotechnology as well as Director of Research and Deputy Head of the Department of Materials at Imperial College London.  In October 2011, he joined The Ohio State University as the founding director of the Center for Electron Microscopy and AnalysiS (CEMAS).  This multidisciplinary facility will drive the application of state of the art electron microscopy techniques to strategic research challenges in the physical, engineering, life and medical sciences at OSU and beyond.
Contact Prof. Robles Hernandez fcrobles at Central.UH.EDU<mailto:fcrobles at Central.UH.EDU>   if you would like to meet with Dr. McComb.
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