| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Engineering Ceramics: Microstructures, Properties, and Applications
|
| Presentation Title |
New Insights into Deformation Mechanisms of Amorphous Silicon Nitride Nanoporous Membranes from Atomistic Simulations |
| Author(s) |
Ali K. Shargh, James L. McGrath, Niaz Abdolrahim |
| On-Site Speaker (Planned) |
Ali K. Shargh |
| Abstract Scope |
Ultrathin silicon nitride nanoporous membranes are extremely permeable silicon based ceramics that were first developed at University of Rochester in 2014. Despite their potential biomedical applications, the range of working pressure and the size of nanostructures in those applications are limited by mechanical properties. Here, our approach is to improve the mechanical properties of amorphous nanoporous membranes with the change of pore architecture parameters using molecular dynamics simulations. It is found that the arrangement, shape and aspect ratio of the pores are the main factors that control the mechanical properties of nanoporous membranes. Depending on the pore arrangement, three major deformation mechanisms are captured under uniaxial loading. Our results show that the pore arrangement governs the pattern of strain localization in the nanostructure which further control the ductility of structure. Moreover, it is find that the change of aspect ratio beyond a critical value maximize the strength of the nanostructures. |