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Density Functional Tight-Binding Simulations Reveal the Presence of Surface Defects on the Quartz (101)–Water Interface
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    C: Physical Properties of Materials and Interfaces

    Density Functional Tight-Binding Simulations Reveal the Presence of Surface Defects on the Quartz (101)–Water Interface
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    The Journal of Physical Chemistry C

    Cite this: J. Phys. Chem. C 2021, 125, 29, 16246–16255
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    https://doi.org/10.1021/acs.jpcc.1c03689
    Published July 9, 2021
    Copyright © 2021 American Chemical Society

    Abstract

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    Understanding the structure and reactivity of quartz–water interfaces is critical for numerous applications in the geological, environmental, and biological sciences. However, disagreements on the atomic-level structure of the interfaces between experiments and simulations are hampering our ability to predict the surface reactivity. Here, we used density functional tight-binding (DFTB)-based molecular dynamics to simulate a series of quartz (101) surfaces having different types and densities of surface defects in water and compared them with the structures determined by X-ray reflectivity measurements. The DFTB simulations are able to reproduce previous classical and quantum mechanical predictions of the pristine quartz (101)–water interface that disagree with experimental observations. To remedy this situation, a set of defective quartz surfaces having various surface silicon (Si) vacancies were built as indicated by recent experimental studies. We found that the rotation of surface [SiO4] tetrahedra near Si vacancies can lead to outward displacements of Si atoms similar to those observed in the experiments. The presence of additional surface Si vacancies caused inward relaxations of terminal oxygens through the formation of hydrogen bonds. The overall results indicate that the quartz (101)–water interface may include a mixture of geminal (≡Si–(OH)2)- and vicinal (≡Si–OH)-type silanol groups together with the presence of surface Si vacancies.

    Copyright © 2021 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.jpcc.1c03689.

    • Computational details on the DFTB calculations; vertical relaxations and electron density profiles of the defective quartz (101) surface with 50% Si1, Si2, or Si3 vacancy; vertical relaxations and electron density profiles of the defective quartz (101) surface with a mixture of either 25% of Si1Si2, Si1Si3, or Si2Si3 vacancies; a reference model used for energy difference calculation; vertical relaxations and electron density profiles of the calculated defective quartz (101) surfaces containing various O vacancies and an edge-shared [SiO4] defective surface; vertical relaxations and electron density profiles of the defective quartz (101) surface with 50% rotation of surface [SiO4] groups together with the increasing amount of Si3 vacancies (PDF)

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    Cited By

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    This article is cited by 8 publications.

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    The Journal of Physical Chemistry C

    Cite this: J. Phys. Chem. C 2021, 125, 29, 16246–16255
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.jpcc.1c03689
    Published July 9, 2021
    Copyright © 2021 American Chemical Society

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