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Appl. Sci. 2017, 7(12), 1229; https://doi.org/10.3390/app7121229

Infrared Spectroscopy as Molecular Probe of the Macroscopic Metal-Liquid Interface

1
Technische Thermodynamik, University of Bremen, Badgasteiner Str. 1, 28359 Bremen, Germany
2
School of Engineering, University of Aberdeen, Aberdeen AB24 3UE, UK
3
Erlangen Graduate School in Advanced Optical Technologies (SAOT), Universität Erlangen-Nürnberg, 91052 Erlangen, Germany
4
MAPEX Center for Materials and Processes, University of Bremen, Bibliothekstr. 1, 28359 Bremen, Germany
5
Combustion Physics, Lund University, P.O. Box 118, 221 00 Lund, Sweden
6
Division of Synchrotron Radiation Research, Lund University, 221 00 Lund, Sweden
*
Author to whom correspondence should be addressed.
Received: 7 October 2017 / Revised: 13 November 2017 / Accepted: 23 November 2017 / Published: 28 November 2017
(This article belongs to the Special Issue Optics and Spectroscopy for Fluid Characterization)
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Abstract

Metal-liquid interfaces are of the utmost importance in a number of scientific areas, including electrochemistry and catalysis. However, complicated analytical methods and sample preparation are usually required to study the interfacial phenomena. We propose an infrared spectroscopic approach that enables investigating the molecular interactions at the interface, but needing only minimal or no sample preparation. For this purpose, the internal reflection element (IRE) is wetted with a solution as first step. Second, a small plate of the metal of interest is put on top and pressed onto the IRE. The tiny amount of liquid that is remaining between the IRE and the metal is sufficient to produce an IR spectrum with good signal to noise ratio, from which information about molecular interactions, such as hydrogen bonding, can be deduced. Proof-of-concept experiments were carried out with aqueous salt and acid solutions and an aluminum plate. View Full-Text
Keywords: hydrogen bonding; ATR-FTIR; adsorption hydrogen bonding; ATR-FTIR; adsorption
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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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Kiefer, J.; Zetterberg, J.; Ehn, A.; Evertsson, J.; Harlow, G.; Lundgren, E. Infrared Spectroscopy as Molecular Probe of the Macroscopic Metal-Liquid Interface. Appl. Sci. 2017, 7, 1229.

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