Analysis of the Ice/Quartz Interface under Compression and Shearing Using Molecular Dynamics Simulations.
Yifeng Huang1, Lianjun Yang1, Enlong Liu1
1State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China.
The Journal of Physical Chemistry. B
|February 13, 2025
Summary
Molecular dynamics simulations reveal that a premelting nanofluid layer at the ice/quartz interface significantly influences shear stress. This layer exhibits shear thinning and its thickness affects stress, impacting tribology and hydrodynamics.
Area of Science:
- Materials Science
- Surface Science
- Computational Physics
Background:
- The behavior of interfaces between dissimilar materials is critical in various scientific and engineering applications.
- Understanding the premelting phenomena at interfaces, such as ice/quartz, is essential for predicting macroscopic properties.
- Nanofluids at interfaces can exhibit unique properties influencing mechanical responses.
Purpose of the Study:
- To investigate the properties of the ice/quartz interface using molecular dynamics simulations.
- To elucidate the role of the interfacial premelting liquid in compression and shearing processes.
- To establish the relationship between interfacial properties and tribological/hydrodynamic theories.
Main Methods:
- Molecular dynamics (MD) simulations were employed to model the ice/quartz interface.
- Simulations analyzed the effects of sliding velocity, compression, and temperature on interfacial behavior.
- Microscopic mechanisms of shear stress and premelting layer evolution were examined.
Main Results:
- The premelting liquid at the ice/quartz interface acts as a nanofluid, crucial for compression and shear.
- Sliding velocity, compression, and temperature are key factors determining shear stress at the interface.
- A logarithmic relationship between shear stress and shear rate was observed in the premelting liquid, indicating shear thinning.
- Increased compression and temperature thicken the premelting layer, reducing shear stress.
- Under sufficient premelting layer thickness, shear stress can oppose the sliding direction.
Conclusions:
- The study provides an atomic-scale understanding of the ice/quartz interface, highlighting the significance of the premelting layer.
- Interfacial shear behavior is governed by the premelting layer's thickness, viscosity, and response to external stimuli.
- Findings connect microscopic simulation results to macroscopic tribological and hydrodynamic principles.
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