| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
Interfacial Process Underlying the Environment-Dependent Friction on Calcite Single Crystals |
| Author(s) |
Binxin Fu, Rosa M. Espinosa-Marzal |
| On-Site Speaker (Planned) |
Binxin Fu |
| Abstract Scope |
Abundant in the Earth's lithosphere, calcite-bearing rocks play a crucial role in deciphering fault slips and seismic events. The simplicity of nanoscale measurements on single calcite crystals enables a though insight into various factors that may affect strength of the calcite contacts and, consequently, fault stability. Friction measurements were performed by atomic force microscopy (AFM) with both silica (blunted and colloidal) and calcite tips, and humid vs. aqueous environment. In low humidity, logarithmical velocity-strengthening friction was observed with blunted silica tips, while colloidal silica tips maintained a linear relationship. Calcite tips exhibited mainly logarithmic weakening regime, which was attributed to contact aging from atomic attrition or reduced cementation with velocity. The linear regime was relating to calcite dissolution and occurred in CaCO3 saturated solution with all tips. These findings enhance our understanding of interfacial and mechanochemical processes involving calcite, with broad implications for environmental and geochemical systems. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, Thin Films and Interfaces, Characterization |