Molecular Simulation of Carbon Dioxide Dynamics in Clay Minerals

Molecular simulation has emerged as a cornerstone technique for unravelling the adsorption, intercalation and transport of carbon dioxide within layered clay minerals. By combining molecular dynamics and Monte Carlo methods with quantum-mechanical calculations, researchers can probe the influence of interlayer cations, hydration state and layer charge on CO₂ uptake and mobility under geologically relevant pressures and temperatures. These studies reveal how clay swelling, fractional free volume and electrostatic interactions govern retention and release of CO₂, with direct implications for the design of carbon-capture materials and the assessment of caprock integrity in geological storage. The interplay between computational predictions and laboratory measurements continues to refine our understanding of nanoscale confinement effects, driving advances in sustainable carbon management.

Research from Nature Portfolio

Foundational work has shown that synthetic fluorohectorite smectite can intercalate CO₂ at near-ambient conditions, with the retention temperature and capacity strongly dependent on the nature and valence of interlayer cations. Follow-up molecular dynamics investigations quantified how CO₂ concentration and temperature modulate self-diffusivity, Maxwell–Stefan and Fick diffusivities in Na-clay interlayers, revealing a maximum in transport rates at intermediate loadings linked to swelling and free-volume changes. Complementary studies on nickel-fluorohectorite demonstrated exceptionally high volumetric CO₂ uptake at room temperature, attributing this performance to high layer charge density and specific cation–CO₂ interactions that facilitate reversible capture and release.

Molecular Simulation of Carbon Dioxide Dynamics in Clay Minerals publication trend

The graph below shows the total number of articles in molecular simulation of carbon dioxide dynamics in clay minerals across all publications each year (not limited to Nature Index journals).

Technical terms

Molecular dynamics (MD): A computational technique that simulates the time-evolution of atomic and molecular systems by integrating Newton’s equations of motion.

Grand canonical Monte Carlo (GCMC): A statistical method for sampling particle insertions and deletions at fixed chemical potential, volume and temperature to predict adsorption equilibria.

Intercalation: The reversible insertion of guest molecules into the interlayer spaces of layered materials without major structural collapse.

Smectite: A family of expandable clay minerals, characterised by two-dimensional aluminosilicate layers and exchangeable interlayer cations.

Fluorohectorite: A synthetic smectite in which hydroxyl groups are replaced by fluoride, serving as a model system for cation-mediated intercalation studies.

Density functional theory (DFT): A quantum-mechanical modelling method used to calculate electronic structure and predict interaction energies between atoms and molecules.

Maxwell–Stefan diffusivity: A measure of multicomponent diffusion that accounts for frictional interactions between different molecular species in confined environments.

References

1. Intercalation and Retention of Carbon Dioxide in a Smectite Clay promoted by Interlayer Cations. Scientific Reports (2015).
2. Self-diffusivity, M–S and Fick diffusivity of CO2 in Na-clay: The influences of concentration and temperature. Scientific Reports (2017).
3. CO2 Capture by Nickel Hydroxide Interstratified in the Nanolayered Space of a Synthetic Clay Mineral. The Journal of Physical Chemistry C (2020).
4. CO2 Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral. Langmuir (2021).
5. Understanding methane/carbon dioxide partitioning in clay nano- and meso-pores with constant reservoir composition molecular dynamics modeling. Physical Chemistry Chemical Physics (2019).