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CREATED:20240129T193148Z
LAST-MODIFIED:20240129T193148Z
UID:10596-1710979200-1710979200@seasevents.nmsdev7.com
SUMMARY:This Seminar is currently Postponed. MSE Seminar: "Tuning Nanostructured Materials for Combustion Applications"
DESCRIPTION:Metals powders like aluminum and boron are attractive potential fuel additives for pyrotechnics\, propellants and explosives due to their high energy release upon oxidation. However\, they tend to agglomerate\, have lengthy ignition delays\, and low combustion rates/efficiencies. This work aims to design metal powders with tuned surface\, micro-structure\, morphology\, or chemistries to mitigate these challenges and favor the formation of desired products and high energy release; without jeopardizing thermochemical performance\, safety\, and stability. One approach used is to incorporate elements (like Fe) that can act as oxygen shuttle catalysts for surface reactions or to introduce elements to form exothermic intermetallic products (like Zr). Ball-milling allows a simple one pot technique to incorporate these elements to form metastable nanocomposite powders with lower ignition thresholds and improved combustion efficiencies. Novel experimental and diagnostic tools like x-ray phase contrast imaging (XPCI) and snapshot hyper-spectral imager for emissions and reactions (SHEAR) have been coupled to capture condensed phase/internal particle features and external optical emissions\, temperatures\, and gas phase species from combustion reactions\, respectively. Machine learning is also used to obtain quantitative data: identify trends\, detect anomalies\, and classify particle events from the videos produced of combustion scenes. Results show that surface modification to boron reduces ignition delays and doping boron with as low as 1wt% Fe improves surface reaction rates in air. Other additives like Bi and Co also help to change boron’s oxidation mechanism. For aluminum\, powders can be modified by emulsion assisted milling to produce spheres of various sizes by changing the milling parameter space with process control agents like acetonitrile and hexane\, and the addition of Zr can accelerate combustion in thermite formulations and allow Al powders to burn in multiple phases with improved combustion efficiencies.
URL:https://seasevents.nmsdev7.com/event/mse-seminar-tuning-nanostructured-materials-for-combustion-applications/
CATEGORIES:Seminar
ORGANIZER;CN="Materials Science and Engineering":MAILTO:johnruss@seas.upenn.edu
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