[CCoE Notice] Seminar: Celebration of Apollo 50th anniversary: In situ electron microscopy studies of moon rocks * MH180, Business School * 10:30 am, Friday, Nov. 22, 2019 * Jane Y. Howe * University of Toronto *

[Knudsen, Rachel W]

***** Seminar *****
Department of Electrical and Computer Engineering
Materials Engineering Program
Center for Integrated Bio and Nano Systems
  November 22, 2019
10:30 a.m., Room: MH180, Business School
Celebration of Apollo 50th anniversary: In situ electron microscopy studies of moon rocks
Jane Y. Howe
College Department of Materials Science and Engineering
Department of Chemical Engineering and Applied Chemistry
University of Toronto
Abstract: Our ability to image surface and bulk features of materials plays an important role in the field of nano-scaled materials research.  Even more desirable is the capability to simultaneously image morphological and structural changes that occur on the surface and within the bulk of a material with additional stimuli, such as during in situ heating, in situ oxidation, or under tensile stress.
As an example, the findings of the in situ heating of lunar soils to simulate micrometeorite impacts on the lunar surface will be presented in this talk (samples brought back by Apollo. 14 and 17 Missions).  We carried out slow- and rapid-heating experiments inside the transmission electron microscope to understand the chemical and microstructural changes in surface soils resulting from space-weathering processes.  The slow-heating experiments indicated that the formation of Fe nanoparticles starts at ~575 °C.  These nanoparticles also form as a result of rapid-heating experiments, and electron energy-loss spectroscopy measurements show the Fe nanoparticles are composed entirely of Fe0, suggesting this simulation accurately mimics micrometeorite space-weathering processes occurring on airless body surfaces. In addition to Fe nanoparticles, rapid-heating experiments also produced vesiculated textures in the samples.  In order to simulate multiple impacts by micrometeorites, we also performed repeated thermal shocks, and measured size and distribution of Fe nanoparticles evolved with each subsequent heating event.  In summary, these results offer insight into the formation and growth mechanisms for Fe nanoparticles in space-weathered soils.  In situ heating in TEM is proven to be a viable new methodology for lunar and planetary materials research.
Bio: Jane Howe joined the Faculty of University of Toronto in 2019, serving as an Associate Professor jointly in the Department of Materials Science and Engineering and the Department of Chemical Engineering and Applied Chemistry.  Prior to her new position at UofT, Jane worked as a Senior Applications Scientist with Hitachi High-Technologies group in US and Canada from 2013 to 2018.  Jane received her Ph.D. in Ceramic Science from Alfred University in 2001.  After a postdoc at Oak Ridge National Laboratory, Jane stayed at ORNL as a Staff Scientist and Principal Investigator until 2012.  She has over 200 publications on electron microscopy and materials characterization and development.  She holds eight US patents and won two R&D 100 Awards on nanostructure carbon materials and lithium battery technologies.  Jane’s current research interest is in situ and correlative microscopy techniques.
Contact Prof. Robles Hernandez <fcrobles at Central.UH.EDU> if you would like to meet with Dr. Howe.
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