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

Natalia García Rey | Zendy; Eric Weißenborn | Zendy; Felix Schulze-Zachau | Zendy; G. Gochev | Zendy; Björn Braunschweig | Zendy

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

Author(s) -

Natalia García Rey,

Eric Weißenborn,

Felix Schulze-Zachau,

G. Gochev,

Björn Braunschweig

Publication year - 2018

Publication title -

the journal of physical chemistry c

Language(s) - English

Resource type - Journals

eISSN - 1932-7455

pISSN - 1932-7447

DOI - 10.1021/acs.jpcc.8b10097

Subject(s) - sum frequency generation spectroscopy , bromide , chemistry , spectroscopy , sum frequency generation , spectral line , cationic polymerization , analytical chemistry (journal) , disjoining pressure , molecule , layer (electronics) , infrared spectroscopy , chromatography , materials science , inorganic chemistry , organic chemistry , thin film , nanotechnology , optics , physics , laser , quantum mechanics , astronomy , nonlinear optics

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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