Conferences, Lectures, & Seminars
Events for October
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MFD Seminar: Mathematical Design of Energy Materials
Tue, Oct 04, 2022 @ 04:00 PM - 05:20 PM
Mork Family Department of Chemical Engineering and Materials Science
Conferences, Lectures, & Seminars
Speaker: Professor Ananya Balakrishna , WiSE Gabilan Assistant Professor and Assistant Professor of Aerospace and Mechanical Engineering, University of Southern California
Talk Title: MFD Distinguished Lecture Series: Mathematical Design of Energy Materials
Abstract: "We live in a world in constant need of better materials for energy conversion and storage. We need to not only discover energy materials with enhanced properties, but we need to do so urgently - that is, there is a need to establish a quantitative design framework to accelerate materials development. Finding design principles to improve material properties is the focus of my research group. In my talk, I will present our research on, first, how microstructural instabilities and fundamental material constants contribute to hysteresis in soft magnets. We have developed a coercivity tool that, for the first time, combines micromagnetics and nonlinear stability analysis to predict hysteresis in magnetic alloys and, thereby, provides crucial insights into the longstanding
permalloy problem in soft magnets. Second, I will share some of our work on crystallographically designing microstructures to mitigate degradation in intercalation materials. While suppressing chemo-mechanical degradation has been a longstanding problem, our ongoing work initiates a new line of research by drawing inspiration from shape memory alloys to crystallographically design structural transformations. Finally, I will conclude by showing some ongoing work on designing microstructures in photo-induced phase transformation materials. These materials undergo extreme deformations on exposure to light and are an emerging class of phase transformation materials with applications in remote actuation. Throughout, I will emphasize how developing multi-physics and multi-scale mathematical methods (e.g., phase-field methods, phase-field crystal methods) allows my group to answer new questions about how microstructures affect material properties."
Biography: Ananya Renuka Balakrishna joined the Department of Aerospace and Mechanical Engineering at USC as an Assistant Professor in Fall 2020. Prior to joining USC, she pursued postdoctoral research as a Lindemann Fellow at MIT (Department of Materials Science), and at the University of Minnesota (Aerospace Engineering and Mechanics). Ananya received her PhD in Solid Mechanics and Materials Engineering from the University of Oxford. Broadly, her research focuses on developing mathematical models to investigate the links between material instabilities, microstructures, and properties in energy-storage and functional materials.
Host: Mork Family Department of Chemical Engineering and Materials Science
More Information: Ananya Balakrishna Seminar Flyer 10.4.22.pdf
Location: James H. Zumberge Hall Of Science (ZHS) - 352
Audiences: Everyone Is Invited
Contact: Anthony Tritto
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MFD Seminar: Mechanisms for Diffusion Dependent Interfacial Strain: New Insights for Ultrahigh Temperature In Situ TEM
Tue, Oct 18, 2022 @ 04:00 PM - 05:20 PM
Mork Family Department of Chemical Engineering and Materials Science
Conferences, Lectures, & Seminars
Speaker: Professor Shen J. Dillon, Professor of Materials Science and Engineering, University of California, Irvine
Talk Title: Mechanisms for Diffusion Dependent Interfacial Strain: New Insights for Ultrahigh Temperature In Situ TEM
Abstract: Series: MFD Distinguished Lecture Series
Polycrystals can exhibit high-temperature interface-mediated strain in response to an externally applied stress, such as creep, superplasticity, or hot-press sintering, or internal stress, such as stress relaxation at interfaces during thermal cycling or oxide scale growth, fission bubble growth, and densification during sintering. Such problems have mostly been analyzed and treated in the context of purely diffusional models. The diffusional flux, however, is one of only three necessary steps or conditions required for diffusional dependent interfacial strain, the other two include interfacial dislocation nucleation and the emission and absorption of point defects at the interfacial dislocations. The prevalence of diffusional rate limited models results from somewhat unsubstantiated assumptions within the early literature along with the non-uniqueness of the various rate-limiting kinetic models, i.e., disparate models often fit isothermal kinetic data obtained from polycrystalline experiments equally well.
Our group developed a laser heating-based approach for ultrahigh temperature in situ transmission electron microscopy (TEM) during small-scale mechanical testing. This approach enables a more direct characterization of interfacial strain kinetics and thermodynamics at individual grain boundaries, which provides an improved basis for evaluating the high-temperature deformation mechanisms. This talk will present experiments that reveal grain boundary dislocation nucleation limits interfacial strain kinetics in many systems up to relatively large stresses. Based on the experimental observations, new models for sintering and grain boundary creep are developed to account for the appropriate mechanism. These are demonstrated to fit experimental data well, predict broad trends in the literature, and provide explanations for several poorly understood phenomena within the sintering and creep literature. The talk will conclude by discussing the broader implications of the new scientific understanding.
Biography: Shen J. Dillon is a Professor in the Department of Materials Science and Engineering at the University of California Irvine. He received his B.S. and then Ph.D. in Materials Science and Engineering from Lehigh University in 2007. He began as an Assistant Professor at the University of Illinois at Urbana-Champaign in 2009 and joined the faculty at UC Irvine in 2021. His scientific interests relate to understanding the key role played by inorganic interfacial structure-property relationships in affecting the performance of systems in extreme environments. Much of his recent work relates to developing and applying novel in situ characterization techniques that can be applied to understanding the dynamic properties of materials and their interfaces. He is the author of over 100 articles and was a recipient of the 2011 Department of Energy Early Career Award, the 2013 National Science Foundation CAREER Award, and the 2015 American Ceramic Society's Robert L. Coble Award for Young Scholars.
Host: Professor Branicio, Mork Family Department of Chemical Engineering and Materials Science
More Information: Shen Dillon Seminar Flyer 10.18.22 (1).pdf
Location: James H. Zumberge Hall Of Science (ZHS) - 352
Audiences: Everyone Is Invited
Contact: Anthony Tritto
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MFD Seminar With Professor Kelsey Stoerzinger
Tue, Oct 25, 2022 @ 04:00 PM - 05:20 PM
Mork Family Department of Chemical Engineering and Materials Science
Conferences, Lectures, & Seminars
Speaker: Professor Kelsey Stoerzinger, Chemical, Biological & Environmental Engineering Assistant Professor, Oregon State University
Talk Title: MFD Seminar With Professor Kelsey Stoerzinger
Series: MFD Distinguished Lecture Series
Biography: Expertise and Interests:
Kelsey Stoerzinger's research interests span the (electro)chemical transformation of molecules into fuels, chemical feedstocks, and recovered resources. Special emphasis is put on the use of abundant elements to drive these reactions in an economical and scalable manner by renewable electricity. Surface science approaches are used to probe the reaction mechanism by in situ and operando X-ray and vibrational spectroscopies. In 2021, she received the NSF CAREER award for her work in seawater electrolysis.
Biography:
Scientist -“ Pacific Northwest National Laboratory (joint appointment, 2018-present)
Linus Pauling Postdoctoral Fellow -“ Pacific Northwest National Laboratory (2016-2018)
Ph.D. -“ Materials Science and Engineering, Massachusetts Institute of Technology, NSF Graduate Research Fellow (2011-2016)
M.Phil. -“ Physics, University of Cambridge, Churchill Fellow (2010-2011)
B.S. -“ Materials Science and Engineering, Northwestern University (2006-2010)
Host: Professor Sharada, Mork Family Department of Chemical Engineering and Materials Science
Location: James H. Zumberge Hall Of Science (ZHS) - 352
Audiences: Everyone Is Invited
Contact: Anthony Tritto