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Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
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Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...

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Fluid-cell Raman Spectroscopy for operando Studies of Reaction and Transport Phenomena during Silicate Glass Corrosion
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Interaction between water and defective silica surfaces.

Yun-Wen Chen1, Hai-Ping Cheng

  • 1Department of Physics and Quantum Theory Project, University of Florida, Gainesville, Florida 32611, USA.

The Journal of Chemical Physics
|March 25, 2011
PubMed
Summary

Surface defects significantly impact water interactions with silica. While defects enhance single molecule and cluster adsorption, they weaken thin film adsorption due to collective hydrogen bonding effects.

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Published on: January 4, 2016

Area of Science:

  • Materials Science
  • Surface Chemistry
  • Computational Chemistry

Background:

  • Quartz (SiO2) is a ubiquitous material with diverse applications.
  • Understanding water-silica interactions is crucial for geochemistry and materials science.
  • Surface defects can alter material properties and reactivity.

Purpose of the Study:

  • Investigate the influence of Frenkel-like defects on dry alpha-quartz (0001) surfaces.
  • Analyze the adsorption behavior of water molecules, clusters, and thin films on defective quartz surfaces.
  • Determine the effects of oxygen vacancies and displacements on water-silica interface energetics and bonding.

Main Methods:

  • Employing density functional theory (DFT) calculations.
  • Studying dry (1x1) alpha-quartz (0001) surfaces with oxygen vacancy and displacement defects.
  • Analyzing adsorption energies, bonding energies, and charge transfer.

Main Results:

  • Defects significantly enhance interactions between single water molecules and clusters with the quartz surface.
  • Defects exhibit minimal or negative effects on water thin film-quartz surface interactions.
  • Collective hydrogen bonding in water films weakens the overall film-surface interaction, especially in the presence of defects.
  • Lowest total energy configurations for clusters on defective surfaces reduce both bonding and adsorption energies.

Conclusions:

  • Frenkel-like defects on alpha-quartz surfaces have contrasting effects on water adsorption depending on the water form (molecule, cluster, or film).
  • The collective behavior of water molecules in thin films, mediated by hydrogen bonding, is key to understanding the reduced interaction strength on defective surfaces.
  • Computational modeling provides insights into the atomic-level mechanisms governing water-surface interactions influenced by defects.