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Calendar: ALS Calendar
Title: ALS-CXRO Seminar Series: Steven Kelly
When: 09/24/2013 1:00 PM - 2:00 PM
Description: "Looking Inside the Box: Understanding Dynamic Systems"
Steven Kelly (LBNL)

Tuesday Sept 24 @ 1:00pm
2-400F Conf Room

Chemical reactions and phase transformations affect our lives in many ways, from the complex biological processes that make life possible, to semiconductor processing and device manufacturing. However, harnessing these reactions to do something useful (e.g., produce new functional materials) requires a deep understanding of how they work. In situ measurement techniques (those applied while the reaction is happening) provide a unique opportunity to observe these transformations in action, revealing the responsible mechanisms directly. These measurements, while difficult and often requiring new instrumentation to be developed, can yield powerful results not otherwise obtainable.

In this talk I will present results from recent in situ measurements I performed examining a variety of chemical and material transformations. I will first show how in situ x-ray diffraction revealed the detailed kinetics of metal hydride growth at the nanoscale. Next, I will present results from time resolved x-ray microdiffraction experiments that examined the phase transformation sequence in the self-propagating exothermic reactions of reactive multilayer metal foils. Finally, I will show how in situ scanning transmission x-ray microscopy can be used to reveal the details of phase separation events in mixed organic/inorganic atmospheric aerosol particles at controlled relative humidity levels. These measurements provided valuable data for guiding advanced material development and painting a more accurate picture of the processes occurring in the atmosphere.
Location: 2-400F Conf Room