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Binary Solvent Organization at Silica/Liquid Interfaces: Preferential Ordering in Acetonitrile-Methanol Mixtures.

Eric A Gobrogge1, Robert A Walker1

  • 1Department of Chemistry and Biochemistry, Montana State University, P.O. Box 173400, Bozeman, Montana 59717, United States.

The Journal of Physical Chemistry Letters
|August 18, 2015
PubMed
Summary

Nonlinear vibrational spectroscopy reveals how methanol and acetonitrile organize at silica interfaces. Acetonitrile forms a distinct bilayer structure at higher concentrations, influencing solvent organization.

Keywords:
acetonitrilecompetitive adsorptionliquid chromatographymethanolsilicavibrational sum frequency generation

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Area of Science:

  • Surface Science
  • Physical Chemistry
  • Spectroscopy

Background:

  • Understanding solvent organization at interfaces is crucial for chemical processes.
  • Silica surfaces are common in various industrial and natural settings.
  • Binary solvent mixtures present complex interfacial behavior.

Purpose of the Study:

  • To investigate the interfacial organization of methanol and acetonitrile mixtures on silica.
  • To compare solvent behavior at the silica/liquid and silica/vapor interfaces.
  • To elucidate the structural arrangement of acetonitrile at high concentrations.

Main Methods:

  • Nonlinear vibrational spectroscopy was employed to study silica/binary solvent interfaces.
  • Surface vibrational spectra were acquired from silica exposed to vapor-phase binary solvent mixtures.
  • Data from liquid and vapor phases were compared to understand adsorption and accumulation.

Main Results:

  • Methanol preferentially adsorbs to the silica/vapor interface.
  • Acetonitrile accumulates in excess at the silica/liquid interface compared to the vapor phase.
  • Acetonitrile forms a bilayer structure at high concentrations, with a second layer of weakly associating antiparallel molecules.

Conclusions:

  • The study elucidates the complex adsorption and organization of methanol and acetonitrile at silica interfaces.
  • Acetonitrile's unique bilayer formation significantly impacts interfacial solvent structure.
  • Findings provide insights into molecular interactions at solid-liquid interfaces.