Conferences, Lectures, & Seminars
Events for February
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Additive Manufacturing of Metals: Building Unreliable Microstructures 20 Microns at a Time
Thu, Feb 04, 2016 @ 12:45 PM - 02:00 PM
Mork Family Department of Chemical Engineering and Materials Science
Conferences, Lectures, & Seminars
Speaker: Professor Lyle Levine, National Institute of Standards and Technology
Talk Title: Additive Manufacturing of Metals: Building Unreliable Microstructures 20 Microns at a Time
Series: Graduate Seminar
Abstract: Additive manufacturing of metals could revolutionize the design and production of complex, high value metal parts. However, the extreme processing conditions of, essentially, welding millions of microscopic bits of metal together, create deleterious microstructures with high stresses, extreme compositional gradients, non-equilibrium phases, and a variety of potentially disastrous build flaws. How can the processing and post processing treatments be optimized to produce useable and consistent microstructures and mechanical properties? We are developing a comprehensive methodology to answer three questions: what is there?, why is it there?, and how can
we fix what is there? To optimize the build and post build processing steps, we are developing and using a combination of multicomponent computational thermodynamic and kinetic microstructural evolution simulations, finite element models, and worldleading stress and microstructure characterization methods using synchrotron X-rays, neutrons, and lab based measurements. I will describe our progress in our first target
systems, Ni-based super alloys and steels.
Location: James H. Zumberge Hall Of Science (ZHS) - 159
Audiences: Everyone Is Invited
Contact: Martin Olekszyk
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Band-Engineered Complex Oxide Interfaces: New Insights and Opportunities
Thu, Feb 11, 2016 @ 12:45 PM - 01:45 PM
Mork Family Department of Chemical Engineering and Materials Science
Conferences, Lectures, & Seminars
Speaker: Professor Bharat Jalan, University of Minnesota
Talk Title: Band-Engineered Complex Oxide Interfaces: New Insights and Opportunities
Series: Graduate Seminar
Abstract: Complex oxide heterostructures can show strong correlation effects, novel magnetism, high breakdown voltage, and high 2D electron density (of the order of 1014 cm-2), unattainable in traditional semiconductor heterostructures. High 2D electron densities are of particular interest for studying low-dimensional physics in narrow d-band materials, in addition to fabricating novel plasmonic field-effect devices (FETs). Recent advances in thin film growth approaches have enabled the growth of this material class in thin film and heterostructure forms with pristine structural quality (similar to that of the conventional semiconductors). However the grand challenge in the field is to obtain these materials with the high level of stoichiometric and defect control. In this talk, I will present my groups effort to address these challenges and to utilize intrinsic defects as a new degree of freedom to control materials electronic and magnetic property using the hybrid molecular beam epitaxy (MBE) approach. In particular, I will discuss the role of intrinsic defects in realizing and tailoring the 2D electron gas at perovskite oxide heterojunctions.
I will then present a novel approach for creating high-density 2DEGs at perovskite heterojunction using internal charge transfer. 2D carrier density much higher density than expected based on resolution of the polar discontinuity at perovskite oxide heterojunctions can be achieved via internal charge transfer using band-engineered interfaces. Combining DFT modeling and experiments using x-ray photoelectron spectroscopy, scanning transmission electron microscopy, electron energy loss spectroscopy, energy dispersive x-ray spectroscopy and electronic transport measurements, I will discuss the origin of these carriers, dimensionality and transport mechanisms. Finally, I will discuss how electron and hole doping via band-engineered approaches can be achieved, which may provide an exceptional route to revisit the electronic phase diagrams of transition metal oxides in the clean doping limit.
This work is supported through the University of Minnesota MRSEC under awards DMR-1420013.
Host: Professor Jayakanth Ravichandran
Location: James H. Zumberge Hall Of Science (ZHS) - 159
Audiences: Everyone Is Invited
Contact: Martin Olekszyk
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The Business of Oil and Gas
Tue, Feb 23, 2016 @ 05:00 PM - 06:00 PM
Mork Family Department of Chemical Engineering and Materials Science
Conferences, Lectures, & Seminars
Speaker: Dr. Jonathan Lilien, Health Environment Safety Technical Services Manager Chevron North America Exploration and Production Company
Talk Title: Environmental and Societal Aspects of Oil & Gas Production in California
Series: USC Energy Institute Seminar Series
Host: USC Energy Institute
More Information: USCEI 2016 Seminar Series 022316.pdf
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Juli Legat