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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

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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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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
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Chemical ordering in magic-size Ag-Pd nanoparticles.

Davide Bochicchio1, Riccardo Ferrando, Rada Novakovic

  • 1Physics Department, University of Genoa and CNR-IMEM, Via Dodecaneso 33, 16146, Genoa, Italy. ferrando@fisica.unige.it.

Physical Chemistry Chemical Physics : PCCP
|July 10, 2014
PubMed
Summary

Magic-size silver-palladium (Ag-Pd) nanoalloys show a surprising palladium enrichment beneath the surface. This subsurface palladium concentration remains stable at high temperatures, impacting nanoparticle properties.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Computational Chemistry

Background:

  • Silver-palladium (Ag-Pd) nanoalloys are crucial in catalysis.
  • Understanding chemical ordering in these nanoparticles is key to optimizing their performance.
  • Magic-size clusters exhibit unique stability and properties.

Purpose of the Study:

  • To investigate the atomic-level chemical ordering in magic-size Ag-Pd nanoalloys.
  • To determine the influence of composition and geometric structure on ordering.
  • To understand the stability of specific elemental arrangements.

Main Methods:

  • Global optimization searches using an atomistic potential derived from density functional theory (DFT) calculations.
  • Simulations of Ag-rich, intermediate, and Pd-rich compositions.
  • Exploration of face-centered cubic (fcc) truncated octahedral, icosahedral, and decahedral structures.
  • Monte Carlo simulations to assess thermal stability.

Main Results:

  • Observed a significant subsurface enrichment of palladium (Pd) in Ag-Pd nanoalloys, beyond surface silver (Ag) enrichment.
  • This subsurface Pd enrichment was found to be more pronounced in nanoparticles compared to bulk systems.
  • The Pd enrichment persisted to high temperatures, indicating significant thermal stability.

Conclusions:

  • The study reveals a unique subsurface palladium enrichment mechanism in Ag-Pd nanoalloys.
  • This phenomenon is rationalized by the energetics of palladium impurity inclusion in silver host nanoparticles.
  • Findings are relevant for understanding and designing Ag-Pd nanoparticles for catalytic applications involving subsurface active sites.