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Quantifying Double-Layer Potentials at Liquid–Gas Interfaces from Vibrational Sum-Frequency Generation

[Image: see text] Vibrational sum-frequency generation (SFG) spectroscopy is demonstrated as a fast method to quantify variations of the electric double-layer potential ϕ(0) at liquid–gas interfaces. For this, mixed solutions of nonionic tetraethyleneglycol-monodecylether (C(10)E(4)) and cationic he...

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Autores principales: García Rey, Natalia, Weißenborn, Eric, Schulze-Zachau, Felix, Gochev, Georgi, Braunschweig, Björn
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2018
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6354727/
https://www.ncbi.nlm.nih.gov/pubmed/30713590
http://dx.doi.org/10.1021/acs.jpcc.8b10097
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author García Rey, Natalia
Weißenborn, Eric
Schulze-Zachau, Felix
Gochev, Georgi
Braunschweig, Björn
author_facet García Rey, Natalia
Weißenborn, Eric
Schulze-Zachau, Felix
Gochev, Georgi
Braunschweig, Björn
author_sort García Rey, Natalia
collection PubMed
description [Image: see text] Vibrational sum-frequency generation (SFG) spectroscopy is demonstrated as a fast method to quantify variations of the electric double-layer potential ϕ(0) at liquid–gas interfaces. For this, mixed solutions of nonionic tetraethyleneglycol-monodecylether (C(10)E(4)) and cationic hexadecyltrimethylammonium bromide (C(16)TAB) surfactants were investigated using SFG spectroscopy and a thin-film pressure balance (TFPB). Derjaguin–Landau–Verwey–Overbeek analysis of disjoining pressure isotherms obtained with the TFPB technique provides complementary information on ϕ(0), which we apply to validate the results from SFG spectroscopy. By using a single ϕ(0) value, we can disentangle χ((2)) and χ((3)) contributions to the O–H stretching modes of interfacial water molecules in the SFG spectra. Having established the latter, we show that unknown double-layer potentials at the liquid–gas interface from solutions with different C(16)TAB/C(10)E(4) mixing ratios can be obtained from an analysis of SFG spectra and are in excellent agreement with the complementary results from the TFPB technique.
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spelling pubmed-63547272019-02-01 Quantifying Double-Layer Potentials at Liquid–Gas Interfaces from Vibrational Sum-Frequency Generation García Rey, Natalia Weißenborn, Eric Schulze-Zachau, Felix Gochev, Georgi Braunschweig, Björn J Phys Chem C Nanomater Interfaces [Image: see text] Vibrational sum-frequency generation (SFG) spectroscopy is demonstrated as a fast method to quantify variations of the electric double-layer potential ϕ(0) at liquid–gas interfaces. For this, mixed solutions of nonionic tetraethyleneglycol-monodecylether (C(10)E(4)) and cationic hexadecyltrimethylammonium bromide (C(16)TAB) surfactants were investigated using SFG spectroscopy and a thin-film pressure balance (TFPB). Derjaguin–Landau–Verwey–Overbeek analysis of disjoining pressure isotherms obtained with the TFPB technique provides complementary information on ϕ(0), which we apply to validate the results from SFG spectroscopy. By using a single ϕ(0) value, we can disentangle χ((2)) and χ((3)) contributions to the O–H stretching modes of interfacial water molecules in the SFG spectra. Having established the latter, we show that unknown double-layer potentials at the liquid–gas interface from solutions with different C(16)TAB/C(10)E(4) mixing ratios can be obtained from an analysis of SFG spectra and are in excellent agreement with the complementary results from the TFPB technique. American Chemical Society 2018-12-20 2019-01-17 /pmc/articles/PMC6354727/ /pubmed/30713590 http://dx.doi.org/10.1021/acs.jpcc.8b10097 Text en Copyright © 2018 American Chemical Society This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License (http://pubs.acs.org/page/policy/authorchoice_ccbyncnd_termsofuse.html) , which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes.
spellingShingle García Rey, Natalia
Weißenborn, Eric
Schulze-Zachau, Felix
Gochev, Georgi
Braunschweig, Björn
Quantifying Double-Layer Potentials at Liquid–Gas Interfaces from Vibrational Sum-Frequency Generation
title Quantifying Double-Layer Potentials at Liquid–Gas Interfaces from Vibrational Sum-Frequency Generation
title_full Quantifying Double-Layer Potentials at Liquid–Gas Interfaces from Vibrational Sum-Frequency Generation
title_fullStr Quantifying Double-Layer Potentials at Liquid–Gas Interfaces from Vibrational Sum-Frequency Generation
title_full_unstemmed Quantifying Double-Layer Potentials at Liquid–Gas Interfaces from Vibrational Sum-Frequency Generation
title_short Quantifying Double-Layer Potentials at Liquid–Gas Interfaces from Vibrational Sum-Frequency Generation
title_sort quantifying double-layer potentials at liquid–gas interfaces from vibrational sum-frequency generation
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6354727/
https://www.ncbi.nlm.nih.gov/pubmed/30713590
http://dx.doi.org/10.1021/acs.jpcc.8b10097
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