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Ab initio MD simulations reveal crucial differences in CO2-water interface dynamics compared to classical methods. This finding impacts understanding of carbon dioxide storage in deep saline aquifers.

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Area of Science:

  • Geochemistry
  • Computational Chemistry
  • Materials Science

Background:

  • Accurate characterization of the supercritical CO2-water interface is vital for effective geological CO2 storage.
  • Molecular dynamics (MD) simulations provide microscopic insights but lack the precision of ab initio methods for this interface.

Purpose of the Study:

  • To investigate the structural and dynamical properties of the CO2-water interface using ab initio MD (AIMD) simulations.
  • To compare AIMD results with classical force-field MD (FF-MD) simulations for interface characterization.

Main Methods:

  • Ab initio MD (AIMD) simulations were employed to model the CO2-water interface.
  • Multidimensional scaling and time-dependent principal component analysis were applied to AIMD trajectories.
  • Results were systematically compared against classical force-field MD (FF-MD) simulations.

Main Results:

  • Both AIMD and FF-MD accurately reproduced molecular orientation at the CO2-water interface.
  • AIMD revealed characteristic water structural fluctuations at the interface, which were less apparent in FF-MD.
  • Significant differences in molecular residence times were observed between AIMD and FF-MD, highlighting the impact of intermolecular force descriptions.

Conclusions:

  • Ab initio MD simulations provide a more accurate depiction of CO2-water interface dynamics than classical force-field methods.
  • The description of intermolecular forces critically influences time-dependent properties of the CO2-water interface.
  • These findings enhance the understanding of CO2 behavior in geological storage environments.