About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
Competition of Diffusion Modes in Nanoscale Materials: Dewetting vs Sublimation |
| Author(s) |
Duncan Burns, Peter Voorhees |
| On-Site Speaker (Planned) |
Duncan Burns |
| Abstract Scope |
We discuss a competition between diffusion behaviours as a result of finite interface width effects with relevance to thin film fabrication and nano-catalyst evolution.
To understand these competing diffusion modes, we construct a phase field model that separately keep track of a diffusing species density and structural order associated with the interface. The philosophy is a departure from conventional treatments within phase field models and provides a physical motivation of the order parameter and subsequent form of the mass mobility that differentiates bulk and surface diffusion.
Motivated by experiments of supported nanoparticle sintering, a simple multi-species extension is discussed relating to interdiffusion between species/phases in relation to contact angles at the nanoscale. The extended model is used to investigate the effects of different types of diffusion modes in nanoparticle dewetting, thereby addressing the evolution/degregation behaviour of the nanoparticle experiments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Thin Films and Interfaces, Nanotechnology, Phase Transformations |