What the Diffuse Layer (DL) Reveals in Non-Linear SFG Spectroscopy
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
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
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)
spectroscopic contributions from Density Functional Theory (DFT)-based ab initio molecular dynamics simulations (DFT-MD/AIMD), we show here that the
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
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)
–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
alone with the protocols given in this work, or by making use of the interplay between experiments and simulations, as described in this work.
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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MDPI and ACS Style
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.
Pezzotti S, Galimberti DR, Shen YR, Gaigeot M-P. What the Diffuse Layer (DL) Reveals in Non-Linear SFG Spectroscopy. Minerals. 2018; 8(7):305.
Pezzotti, Simone; Galimberti, Daria R.; Shen, Y. R.; Gaigeot, Marie-Pierre. 2018. "What the Diffuse Layer (DL) Reveals in Non-Linear SFG Spectroscopy." Minerals 8, no. 7: 305.
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