About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium: Data-Driven Materials Discovery and Phase Stability
|
| Presentation Title |
The Spatial Arrangement of Nanoparticles on Substrates and the Role of Phase Transformations |
| Author(s) |
Cheng-Yu Chen, Duncan W Burns, Peter W. Voorhees, Eric Stach |
| On-Site Speaker (Planned) |
Peter W. Voorhees |
| Abstract Scope |
Nanoparticles are typically deposited on a support or substrate. When this substrate undergoes a phase transformation, such as crystallization, the advancing amorphous-to-crystalline transformation front separates regions of distinct surface energy, creating a moving interfacial energy boundary. We demonstrate that propagating crystallization fronts in amorphous alumina thin films actively drag supported Pt nanoparticles over long distances. To understand the reasons for the nanoparticle migration a phase field model that accounts for long-ranged potentials governing the interactions that differentiates solid-vapor surfaces from the bulk phases is developed. The model focuses on the properties on the surface and allows for a modification of the effective diffusion in the vicinity of the phase boundary. The simulations show that particle-substrate interfacial energy contrast gives rise curvature gradients along the particle-vapor surface and thus a migration of the particles. by which the crystallization front redistributes mass and displaces the particle. |
| Proceedings Inclusion? |
Planned: |