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Experimental Correlation Between Interfacial Water Structure and Mineral Reactivity.

Shalaka Dewan1, Mohsen S Yeganeh2, Eric Borguet1

  • 1†Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States.

The Journal of Physical Chemistry Letters
|August 19, 2015
PubMed
Summary

We show how solvent structure impacts silica surface reactivity using vibrational Sum-frequency Generation (vSFG) spectroscopy. This reveals pH-dependent ion effects on interfacial water, crucial for geochemistry and biology.

Keywords:
salt effectsilica dissolutionsilica/water interfacesum-frequency generation

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Geochemistry

Background:

  • The silica/water interface is critical in geochemical and biological processes.
  • Understanding interfacial solvent structure is key to explaining surface reactivity.
  • Previous hypotheses suggested solvent structure changes influence quartz dissolution.

Purpose of the Study:

  • To experimentally demonstrate the influence of solvent structure on silica/water interfacial reactivity.
  • To investigate the role of cations and pH on interfacial solvent ordering.
  • To correlate interfacial solvent structure changes with quartz dissolution rates.

Main Methods:

  • In situ vibrational Sum-frequency Generation (vSFG) spectroscopy was employed.
  • The study focused on the silica/water interface.
  • Experiments analyzed the response of interfacial solvent to cations across a pH range.

Main Results:

  • The molecular arrangement of interfacial solvent is sensitive to cations in a pH-dependent manner.
  • Highest sensitivity of solvent response to cations was observed at neutral pH.
  • Changes in vSFG spectra correlated with enhanced quartz dissolution in salt water.

Conclusions:

  • vSFG spectroscopy provides mechanistic insights into silica dissolution.
  • Ion-induced alterations in interfacial solvent ordering play a significant role.
  • Findings have implications for protein-water interactions and oil recovery.