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Minerals 2018, 8(7), 305; https://doi.org/10.3390/min8070305

What the Diffuse Layer (DL) Reveals in Non-Linear SFG Spectroscopy

1
LAMBE CNRS UMR8587, Laboratoire Analyse et Modélisation pour la Biologie et l’Environnement, Université d’Evry val d’Essonne, Université Paris-Saclay, Blvd F. Mitterrand, Bat Maupertuis, 91025 Evry, France
2
Department of Physics, University of California, Berkeley, CA 94720, USA
*
Authors to whom correspondence should be addressed.
Received: 11 June 2018 / Revised: 16 July 2018 / Accepted: 16 July 2018 / Published: 20 July 2018
(This article belongs to the Special Issue Molecular Simulation of Mineral-Solution Interfaces)
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Abstract

Following our recent work [Phys. Chem. Chem. Phys. 20:5190–99 (2018)] that provided the means to unambigously define and extract the three water regions at any charged interface (solid–liquid and air–liquid alike), denoted the BIL (Binding Interfacial Layer), DL (Diffuse Layer) and Bulk, and how to calculate their associated non-linear Sum Frequency Generation Spectroscopy (SFG) χ2(ω) spectroscopic contributions from Density Functional Theory (DFT)-based ab initio molecular dynamics simulations (DFT-MD/AIMD), we show here that the χDL2(ω) signal arising from the DL water region carries a wealth of essential information on the microscopic and macroscopic properties of interfaces. We show that the χDL2(ω) signal carries information on the surface potential and surface charge, the isoelectric point, EDL (Electric Double Layer) formation, and the relationship between a nominal electrolyte solution pH and surface hydroxylation state. This work is based on DFT-MD/AIMD simulations on a (0001) α–quartz–water interface and on the air–water interface, with various surface quartz hydroxylation states and various electrolyte concentrations. The conclusions drawn make use of the interplay between experiments and simulations. Most of the properties listed above can now be extracted from experimental χDL2(ω) alone with the protocols given in this work, or by making use of the interplay between experiments and simulations, as described in this work. View Full-Text
Keywords: DFT-MD; SFG; EDL; Silica; aqueous interface; ions enrichment; protonation state; BIL/DL DFT-MD; SFG; EDL; Silica; aqueous interface; ions enrichment; protonation state; BIL/DL
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Pezzotti, S.; Galimberti, D.R.; Shen, Y.R.; Gaigeot, M.-P. What the Diffuse Layer (DL) Reveals in Non-Linear SFG Spectroscopy. Minerals 2018, 8, 305.

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