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Zen A, Roch LM, Cox SJ, Hu XL, Sorella S, Alfè D, Michaelides A. Toward Accurate Adsorption Energetics on Clay Surfaces. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2016; 120:26402-26413. [PMID: 27917256 PMCID: PMC5126707 DOI: 10.1021/acs.jpcc.6b09559] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Revised: 10/31/2016] [Indexed: 05/31/2023]
Abstract
Clay minerals are ubiquitous in nature, and the manner in which they interact with their surroundings has important industrial and environmental implications. Consequently, a molecular-level understanding of the adsorption of molecules on clay surfaces is crucial. In this regard computer simulations play an important role, yet the accuracy of widely used empirical force fields (FF) and density functional theory (DFT) exchange-correlation functionals is often unclear in adsorption systems dominated by weak interactions. Herein we present results from quantum Monte Carlo (QMC) for water and methanol adsorption on the prototypical clay kaolinite. To the best of our knowledge, this is the first time QMC has been used to investigate adsorption at a complex, natural surface such as a clay. As well as being valuable in their own right, the QMC benchmarks obtained provide reference data against which the performance of cheaper DFT methods can be tested. Indeed using various DFT exchange-correlation functionals yields a very broad range of adsorption energies, and it is unclear a priori which evaluation is better. QMC reveals that in the systems considered here it is essential to account for van der Waals (vdW) dispersion forces since this alters both the absolute and relative adsorption energies of water and methanol. We show, via FF simulations, that incorrect relative energies can lead to significant changes in the interfacial densities of water and methanol solutions at the kaolinite interface. Despite the clear improvements offered by the vdW-corrected and the vdW-inclusive functionals, absolute adsorption energies are often overestimated, suggesting that the treatment of vdW forces in DFT is not yet a solved problem.
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Affiliation(s)
- Andrea Zen
- Thomas
Young Centre and London Centre for Nanotechnology, 17−19 Gordon Street, London WC1H 0AH, United
Kingdom
- Department
of Physics and Astronomy, University College
London, Gower Street, London WC1E 6BT, United Kingdom
| | - Loïc M. Roch
- Thomas
Young Centre and London Centre for Nanotechnology, 17−19 Gordon Street, London WC1H 0AH, United
Kingdom
- Department
of Physics and Astronomy, University College
London, Gower Street, London WC1E 6BT, United Kingdom
| | - Stephen J. Cox
- Thomas
Young Centre and London Centre for Nanotechnology, 17−19 Gordon Street, London WC1H 0AH, United
Kingdom
- Department
of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Xiao Liang Hu
- Thomas
Young Centre and London Centre for Nanotechnology, 17−19 Gordon Street, London WC1H 0AH, United
Kingdom
- Department
of Physics and Astronomy, University College
London, Gower Street, London WC1E 6BT, United Kingdom
| | - Sandro Sorella
- SISSA−International
School for Advanced Studies, Via Bonomea 26, 34136 Trieste, Italy
- INFM
Democritos National Simulation Center, 34151 Trieste, Italy
| | - Dario Alfè
- Thomas
Young Centre and London Centre for Nanotechnology, 17−19 Gordon Street, London WC1H 0AH, United
Kingdom
- Department
of Earth Sciences, University College London, Gower Street, London WC1E 6BT, United
Kingdom
| | - Angelos Michaelides
- Thomas
Young Centre and London Centre for Nanotechnology, 17−19 Gordon Street, London WC1H 0AH, United
Kingdom
- Department
of Physics and Astronomy, University College
London, Gower Street, London WC1E 6BT, United Kingdom
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Voinot F, Fischer C, Schmidt C, Ehret-Sabatier L, Angel F. Controlled ingestion of kaolinite (5%) modulates enteric nitrergic innervation in rats. Fundam Clin Pharmacol 2013; 28:405-13. [DOI: 10.1111/fcp.12040] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Revised: 05/02/2013] [Accepted: 06/04/2013] [Indexed: 11/29/2022]
Affiliation(s)
- Florian Voinot
- Université de Strasbourg; IPHC-DEPE; 23 rue Becquerel 67087 Strasbourg France
- CNRS; UMR7178; 67037 Strasbourg France
| | - Caroline Fischer
- Université de Strasbourg; IPHC-DEPE; 23 rue Becquerel 67087 Strasbourg France
- CNRS; UMR7178; 67037 Strasbourg France
| | - Camille Schmidt
- Université de Strasbourg; IPHC-DEPE; 23 rue Becquerel 67087 Strasbourg France
- CNRS; UMR7178; 67037 Strasbourg France
| | - Laurence Ehret-Sabatier
- CNRS; UMR7178; 67037 Strasbourg France
- Université de Strasbourg; IPHC-DSA; 25 rue Becquerel 67087 Strasbourg France
| | - Fabielle Angel
- Université de Strasbourg; IPHC-DEPE; 23 rue Becquerel 67087 Strasbourg France
- CNRS; UMR7178; 67037 Strasbourg France
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