About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Real Time Imaging for Materials Science and Processing
|
| Presentation Title |
In situ transmission electron microscopy observations of oxidation in hydrogenated magnesium nanoparticles |
| Author(s) |
Mahbub Chowdhury, Lei Yang, Brandon Wagner, Matthew Dickson, Lorenzo Mangolini, Michael Russel Zachariah |
| On-Site Speaker (Planned) |
Mahbub Chowdhury |
| Abstract Scope |
We employed environmental TEM imaging to investigate the oxidation mechanisms of magnesium (Mg) and magnesium hydride (MgH₂) nanoparticles. Mg is a promising fuel for energetic applications due to its high energy density and reactivity, but its native oxide shell impedes ignition by requiring Mg to diffuse through the shell to react with oxidizers. To address this limitation, we hydrogenated Mg nanoparticles using a nonthermal plasma process. In situ TEM studies revealed a two-step oxidation mechanism for MgH₂. In the first step (~200 °C), hydrogen desorption exposes a fresh Mg surface, triggering rapid oxidation. In the second step (~450 °C), Mg diffuses from the core and oxidizes further, increasing the shell thickness, indicating continued oxidation. Complete depletion of the Mg core was observed in the hydrogenated sample. In contrast, unmodified Mg nanoparticles oxidized at higher temperatures (~550 °C), and a significant metallic core remained inside. Hydrogenation thus enables earlier onset and more complete oxidation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Characterization, Magnesium |