Effect of Adsorbent Properties on Adsorption-Induced Deformation

Area of Science:

• Geosciences and Engineering
• Materials Science
• Physical Chemistry

Background:

• Adsorption-induced adsorbent deformation is critical for understanding material behavior in geological and engineering applications.
• Previous studies have highlighted the importance of deformation but lacked detailed insights into the interplay of material properties.

Purpose of the Study:

• To investigate methane adsorption-induced deformation in slit pores using advanced simulation techniques.
• To analyze how variations in solid density and affinity affect pore deformation under different adsorbate loadings.

Main Methods:

• Employed grand canonical Monte Carlo (GCMC) simulations to model methane adsorption.
• Obtained adsorption isotherms and quantified pore deformation behaviors for various adsorbent properties.
• Systematically varied solid density and affinity to assess their impact on deformation.

Main Results:

• Adsorption-induced deformation is significantly influenced by adsorbate loading, pore width, solid density, and adsorbent affinity.
• Deformation can be comparable across different solid densities or affinities due to a balance between solvation pressure (driving force) and material resistance.
• The interaction between driving force and resistance dictates the overall deformation behavior.

Conclusions:

• The study provides fundamental insights into adsorption-induced deformation in porous solids with heterogeneous properties.
• Results enable better estimation of material deformation using gas adsorption data.
• Findings are valuable for geoscientists and engineers working with adsorbent materials.