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Types of Coprecipitation01:10

Types of Coprecipitation

Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
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Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
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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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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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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.
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Effects of impurities on surface morphology: some examples.

Ajmi Bh Hamouda1, T J Stasevich, Alberto Pimpinelli

  • 1Department of Physics, University of Maryland, College Park, MD 20742-4111, USA. LASMEA, UMR 6602, NRS/Université Blaise Pascal-Clermont 2, F-63177 Aubière cedex, France.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 6, 2011
PubMed
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Tiny amounts of impurities significantly change material surfaces. This research explores how impurities affect epitaxial growth, island shapes, and critical nucleus size during deposition, offering insights into surface morphology control.

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Area of Science:

  • Surface Science
  • Materials Science
  • Condensed Matter Physics

Background:

  • Impurities are known to influence material properties.
  • Surface morphology is crucial for device performance and material behavior.
  • Understanding impurity effects is key to controlling nanoscale structures.

Purpose of the Study:

  • To investigate the impact of small impurity concentrations on surface morphology.
  • To provide specific examples of impurity-driven morphological changes.
  • To model impurity effects on island dynamics and nucleation.

Main Methods:

  • Analysis of epitaxial growth on Cu(100) with codeposited impurities.
  • Modeling of C(60) decoration on Ag(111) island and vacancy island edges.
  • Characterization of submonolayer pentacene deposition with pentacene quinone impurities.

Main Results:

  • Impurities alter epitaxial growth, changing instability wavelengths and forming pyramids on Cu(100).
  • C(60) edge decoration significantly impacts island shape and dynamics on Ag(111).
  • A small percentage of pentacene quinone impurities modifies critical nucleus size in pentacene deposition.

Conclusions:

  • Even trace impurities exert profound control over surface morphology.
  • Impurity effects can be tailored to manipulate nanoscale structures.
  • The generalized Wigner distribution effectively characterizes impurity-influenced island formation.