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The process of a solid dissolving in a liquid to form a solution is governed by the solubility limit, which is the maximum amount of the solid substance, or solute, that can be dissolved in a specific volume of the liquid or solvent. As the solute dissolves, it reaches a point where no more solute can be dissolved at a given temperature - this is known as the saturation point. However, if further solute is added and it manages to dissolve, the solution becomes supersaturated. Supersaturated...
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Hematite(001)-liquid water interface from hybrid density functional-based molecular dynamics.

Guido Falk von Rudorff1, Rasmus Jakobsen, Kevin M Rosso

  • 1Department of Physics and Astronomy, University College London, London WC1E 6BT, UK.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|July 29, 2016
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Summary

Simulations reveal distinct water interactions at hematite surfaces. Different terminations, iron vs. oxygen, create unique charged species and solvation structures, impacting surface reactivity.

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Area of Science:

  • Surface Science
  • Computational Chemistry
  • Materials Science

Background:

  • Understanding transition metal oxide-liquid water interfaces is crucial for processes like crystal growth, biogeochemical reactions, and solar fuel generation.
  • Atom-scale characterization of these interfaces provides fundamental insights into their behavior.

Purpose of the Study:

  • To investigate the influence of different surface terminations on the hematite(001)-liquid water interface.
  • To understand how surface structure affects surface solvation and the formation of active species.

Main Methods:

  • Employed large-scale hybrid density functional theory-based molecular dynamics simulations.
  • Focused on the hematite(001) surface in contact with liquid water.

Main Results:

  • Identified significant differences in active species and solvation strength between iron-terminated and oxygen-terminated hematite(001) surfaces.
  • Observed autoionization of neutral hydroxyl groups forming charged oxyanions (-O(-)) and doubly protonated oxygens (-OH2) on the iron-terminated surface, absent on the oxygen-terminated surface.
  • The absence of an iron sublayer in the iron-terminated surface led to less ordered solvation structures near the interface.

Conclusions:

  • The distinct surface structures and solvation properties of hematite(001) terminations significantly influence interfacial reactivity.
  • Differences in charged species formation and solvation order are likely to affect the energetics of excess charge carriers at the interface.