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Related Experiment Video

Updated: Jul 12, 2026

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
09:31

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Published on: March 27, 2019

Model for the water-amorphous silica interface: the undissociated surface.

Ali A Hassanali1, Sherwin J Singer

  • 1Biophysics Program and Department of Chemistry, Ohio State University, Columbus, Ohio 43210, USA.

The Journal of Physical Chemistry. B
|September 7, 2007
PubMed
Summary

Researchers developed a new model for the amorphous silica-water interface, crucial for understanding electrochemical processes and applications like sensors. This model accurately predicts the heat of immersion, validating its microscopic approach.

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Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Computational Chemistry

Background:

  • The amorphous silica-water interface is critical for electrochemistry, electrokinetics, and applications like chromatography and sensors.
  • Understanding its properties is essential for designing micro- and nanoscale devices and for metal ion extraction.
  • Existing models for bulk silica and water need extension to accurately represent the hydrated, hydroxylated amorphous silica surface.

Purpose of the Study:

  • To develop a practical microscopic model for the undissociated amorphous silica-water interface.
  • To extend existing bulk silica (BKS) and water (SPC/E) models to describe the hydrated silica surface.
  • To provide a model useful for empirical potential studies and as a foundation for ab initio molecular dynamics.

Main Methods:

  • Extended the BKS and SPC/E models to simulate the hydrated, hydroxylated amorphous silica surface.
  • Determined model parameters using ab initio quantum chemical studies on small molecular fragments.
  • Calculated the heat of immersion and studied water property perturbations near the interface.

Main Results:

  • Developed a model for the undissociated amorphous silica-water interface.
  • Calculated heat of immersion of 0.3 J x m(-2), consistent with experimental values (0.2-0.8 J x m(-2)).
  • Observed that the disordered silica surface exhibits both hydrophilic and hydrophobic regions due to variations in silanol group density.

Conclusions:

  • The developed model provides a microscopic representation of the amorphous silica-water interface.
  • The model's accuracy is supported by its agreement with experimental heat of immersion data.
  • The study highlights the heterogeneous nature of the silica surface, influencing water behavior and interfacial phenomena.