| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale VI
|
| Presentation Title |
Understanding the Role of Surface Faceting in Metallic Nanoparticles via In Situ TEM Compression |
| Author(s) |
Soodabeh Azadehranjbar, Ruikang Ding, Andrew Baker, Ingrid Padilla Espinosa, Ashlie Martini, Tevis Jacobs |
| On-Site Speaker (Planned) |
Soodabeh Azadehranjbar |
| Abstract Scope |
The mechanical behavior of metals is size-dependent, with dislocation-starvation creating a “smaller is stronger” trend, and Coble-creep-like diffusion creating a “smaller is weaker” trend. However, ultra-small nanoparticles tend to form facets with various surface energies that may play a role in the mechanical behavior of nanoparticles (NPs). Here, we explore the effect of surface faceting on the deformation behavior of metallic nanoparticles. Platinum and gold nanoparticles down to single-digit-nanometer sizes were compressed in a transmission electron microscope, with high-resolution measurements of force, deformation, and particle shape transitions. Deformation mechanisms were investigated as a function of the size and shape of nanoparticles. Differences in deformation behavior of Pt and Au NPs were linked to physical properties of nanoparticles such as the homologous temperature, surface diffusion rates, and surface energy. Finally, experimental results were compared with matched atomistic simulations for further insight into driving forces and atomic-scale mechanisms. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nanotechnology, |