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Molecular Dynamics Simulations of Pyrophyllite Edge Surfaces: Structure, Surface Energies, and Solvent Accessibility

Published online by Cambridge University Press:  01 January 2024

Aric G. Newton  and
Garrison Sposito
Aric G. Newton*
Affiliation:
Division of Energy and Environmental Systems, Faculty of Engineering, Hokkaido University, N13 W8, Kita-ku, Sapporo, 060-8628, Japan Division of Ecosystem Sciences, Mulford Hall #3114, University of California at Berkeley, Berkeley, CA 94720-3114, USA
Garrison Sposito
Affiliation:
Geochemistry Department, Division of Earth Sciences, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
*
*E-mail address of corresponding author: [email protected]
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Abstract

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Atomistic simulations of 2:1 clay minerals based on parameterized forcefields have been applied successfully to provide a detailed description of the interfacial structure and dynamics of basal planes and interlayers, but have made limited progress in exploring the edge surfaces of these ubiquitous layer-type aluminosilicates. In the present study, molecular dynamics simulations and energy-minimization calculations of the edge surfaces using the fully flexible CLAYFF forcefield are reported. Pyrophyllite provides an ideal prototype for the 2:1 clay-mineral edge surface because it possesses no structural charge, thus rendering the basal planes inert, while crystal-growth theory can be applied to identify two major candidates for the structure of the edge surfaces. Models based on these candidate structures reproduced bulk crystal bond distances accurately when compared to X-ray data and ab initio molecular simulations, and the predicted edge surface bond distances were in agreement with those determined via ab initio simulation. The calculated surface free energy and surface stress led to an accurate prediction of pyrophyllite nanoparticle morphology, while surface excess energies calculated for the edge surfaces were always negative. These results are consistent with the observed pyrophyllite nanoparticle morphology, with the concept of negative interfacial energies, and conditions that may give rise to them including a role in the stabilization of layer-type nanoparticulate minerals. Molecular dynamics simulations of hydrated nanoparticle edge surfaces indicated five reactive surface oxygen sites on the dominant candidate edge, in agreement with a recent model of proton titration data for 2:1 clay minerals. These promising results illustrate the potential for classical mechanical atomistic simulations that explore edge surface phenomena at much greater length- and times-scales than are currently possible with computationally expensive ab initio methods.

Keywords

Clay Mineral Edge SurfacesMolecular MechanicsPyrophylliteSurface EnergiesSurface Structure
Type
Article
Information
Clays and Clay Minerals , Volume 63 , Issue 4 , August 2015 , pp. 277 - 289
Copyright
Copyright © Clay Minerals Society 2015

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