About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Nanostructured Materials in Extreme Environments
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Presentation Title |
Cu NW Degradation Under High Vacuum Environment |
Author(s) |
Diego Santa Rosa Coradini, Stefan Pogatscher, Cameron Quick, Matheus Tunes, Peter J. Uggowitzer, Thomas Kremmer |
On-Site Speaker (Planned) |
Diego Santa Rosa Coradini |
Abstract Scope |
Nanomaterials are novel materials with a broad range of applications that can sustain different properties than their bulk counterparts due to their large surface-to-volume ratio (SVR). SVR is commonly addressed to phenomena like melting-point depression and Rayleigh instability, which are controlled by surface-activated mechanisms. Therefore, Cu nanowires with radii between 20 and 70 nm were studied within a transmission electron microscope (high vacuum conditions) while heated under temperatures varying from 600 to 850°C. With the help of selected area electron diffraction (SAED), high-resolution brightfield TEM, electron dispersive electroscopy (EDS), and scanning transmission electron microscope (STEM) imaging. It was observed that Cu NW sublimates before the thermodynamical prediction of 750°C at a pressure of around 4x10-6 Pa. We will discuss whether cohesive energy reduction due to the size effect or an imbalance of the condensation-sublimation plays a major role in these observations. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nanotechnology, Other, Characterization |