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

Johannes Kiefer*, Johan Zetterberg, Andreas Ehn, Jonas Evertsson, Gary Harlow, Edvin Lundgren

*Corresponding author for this work

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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.

Original languageEnglish
Article number1229
JournalApplied Sciences
Volume7
Issue number12
Early online date28 Nov 2017
DOIs
Publication statusPublished - Dec 2017

Keywords

  • hydrogen bonding
  • ATR-FTIR
  • adsorption
  • ATR-IR SPECTROSCOPY
  • VIBRATIONAL SPECTROSCOPY
  • SOLID INTERFACE
  • WATER
  • FTIR
  • TOOL
  • ABSORPTION
  • ADSORPTION
  • CORROSION

Cite this

Kiefer, J., Zetterberg, J., Ehn, A., Evertsson, J., Harlow, G., & Lundgren, E. (2017). Infrared Spectroscopy as Molecular Probe of the Macroscopic Metal-Liquid Interface. Applied Sciences, 7(12), [1229]. https://doi.org/10.3390/app7121229