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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Advances in Powder and Ceramic Materials Science
Presentation Title A Novel Design Approach to Achieving High Strength and Ductility in Traditionally Brittle Nanoporous Silicon Nitride Membranes
Author(s) Ali K. Shargh, Gregory L. Madejski, James L. McGrath, Niaz Abdolrahim
On-Site Speaker (Planned) Ali K. Shargh
Abstract Scope Nanoporous silicon nitride membranes (NPN) are ceramic ultrathin films with nanoscale thickness and high porosity. It is well-established that mechanical properties including low strength and ductility of NPN place significant limits on applying them in life-saving filtration applications such as hemodialysis devices. We present a novel framework based on combined MD simulations and experiments to design the microstructure of NPN for improving their mechanical properties. Our MD results demonstrate that pore distribution is the only parameter among different parameters such as porosity and pore diameter that controls ductility of NPN while porosity and pore distribution are main factors affecting the strength in accordance with our companion experiments. We further develop a mathematical model from MD results for predicting the strength of the NPN with different microstructures. In addition, we suggest bottom-up design approach for controlling ductility of fabricated NPN via comparing their pore distribution with microstructures of NPN in simulations.
Proceedings Inclusion? Planned:
Keywords Modeling and Simulation, Thin Films and Interfaces, Other


A Novel Design Approach to Achieving High Strength and Ductility in Traditionally Brittle Nanoporous Silicon Nitride Membranes
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