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A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization
Published on: August 18, 2022
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Influence of AFM Tip Temperature on THF Hydrate Stability: Theoretical Model and Numerical Simulation
Li Peng1, Fulong Ning1,2, Wei Li1
1Faculty of Engineering, China University of Geosciences, Wuhan 430074, China.
Scanning
|November 20, 2019
Summary
Atomic force microscopy (AFM) indentation can melt cold samples like tetrahydrofuran (THF) hydrate. The study models this thermal melting, finding it depends on laser intensity and sample temperature, crucial for characterizing low-temperature materials.
Area of Science:
- Materials Science
- Surface Science
- Thermodynamics
Background:
- Atomic force microscopy (AFM) indentation is a key technique for material mechanical property analysis.
- Low-temperature phase-change materials, such as clathrate hydrates, are challenging to characterize with AFM due to potential tip-induced phase transitions.
- Tetrahydrofuran (THF) hydrate is a representative clathrate hydrate relevant to various scientific and industrial applications.
Purpose of the Study:
- To investigate the thermal influence of an AFM tip on the stability and mechanical characterization of THF hydrate.
- To develop and validate a theoretical and numerical model for predicting tip-induced temperature changes in THF hydrate.
- To understand the factors governing thermal melting during AFM indentation of clathrate hydrates.
Main Methods:
- Established a steady-state heat conduction model between a v-shaped AFM probe and THF hydrate.
- Performed numerical simulations to estimate tip temperature under varying laser intensities and positions.
- Calculated local temperature changes and thermal melting thickness at different THF hydrate temperatures (0°C to -30°C).
Main Results:
- AFM tip significantly increases local temperature, causing thermal melting of THF hydrate.
- Heat loss by air convection is negligible (<1%), simplifying the thermal model.
- Thermal melting thickness is reduced by lower laser intensity and THF hydrate temperature.
- Melting is enhanced by a surface liquid-like layer and increases with contact radius and press-in depth.
Conclusions:
- AFM tip-induced heating is a critical factor affecting THF hydrate stability during indentation.
- The developed model provides insights into thermal effects, aiding in optimizing AFM indentation parameters for low-temperature phase-change materials.
- Understanding thermal melting is essential for accurate mechanical characterization of hydrates and similar materials using AFM.
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