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Hydration of Cement01:24

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Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
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Water Orientation at the Calcite-Water Interface.

Hagen Söngen1, Simon J Schlegel2, Ygor Morais Jaques3

  • 1Physical Chemistry I, Faculty of Chemistry, Bielefeld University, Universitätsstrasse 25, 33615 Bielefeld, Germany.

The Journal of Physical Chemistry Letters
|August 5, 2021
PubMed
Summary
This summary is machine-generated.

Researchers studied the calcite-water interface using advanced techniques. They found opposite water molecule orientations in the first and second hydration layers, revealing crucial details about mineral-water interactions.

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Area of Science:

  • Geochemistry
  • Surface Science
  • Materials Science

Background:

  • Mineral-water interfaces are critical in geological and technological processes.
  • Interfacial water structure significantly influences fundamental interface properties.
  • Calcite, a key rock-forming mineral, is central to understanding these interactions.

Purpose of the Study:

  • To precisely determine the position and orientation of water molecules in calcite hydration layers.
  • To elucidate the structural characteristics of the calcite-water interface at high resolution.
  • To compare water behavior at calcite and magnesite interfaces with different solvents.

Main Methods:

  • Atomic Force Microscopy (AFM) for water molecule positioning.
  • Sum-Frequency Generation (SFG) spectroscopy for water molecule orientation.
  • Molecular Dynamics (MD) simulations for corroboration and detailed analysis.

Main Results:

  • High-resolution determination of water molecule positions at the calcite surface.
  • Identification of specific water molecule orientations within hydration layers.
  • Observed opposite water orientations in the first and second hydration layers of calcite-water interface.
  • Comparative analysis revealed distinct interfacial water structures for calcite-ethanol and magnesite-water/ethanol.

Conclusions:

  • The study provides a comprehensive understanding of water structure at the calcite-water interface.
  • Opposite water orientations in adjacent layers are a key feature of this interface.
  • The findings are supported by a combination of experimental and simulation techniques.
  • This research offers insights into mineral-surface hydration and its implications.