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Colloidal precipitates01:09

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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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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Crystal Field Theory
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Structural evolution induced by Au atom diffusion in Ag2S.

Benjin Jin1, Fu Zhang2, Geng Wu1

  • 1Center of Advanced Nanocatalysis (CAN), Department of Applied Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China. hongxun@ustc.edu.cn.

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Single atoms of gold diffuse into silver sulfide nanomaterials, altering their structure and significantly impacting photocatalytic activity. The resulting material

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Atom diffusion is critical for core-shell nanomaterial properties.
  • Understanding these processes is key to designing advanced materials.

Purpose of the Study:

  • To investigate single-atom diffusion of gold (Au) in silver sulfide (Ag2S) core-shell nanostructures.
  • To characterize the resulting heterostructures and their phase evolution.
  • To correlate structural changes with photocatalytic activity.

Main Methods:

  • Aberration-corrected high-resolution transmission electron microscopy (HRTEM).
  • X-ray absorption near-edge structure (XANES) spectroscopy.
  • In situ X-ray diffraction (XRD).

Main Results:

  • Confirmed single-atom diffusion of Au into Ag2S.
  • Observed transformation from Au@Ag2S core-shell to AuAgS-AuAgx or Ag3AuS2-AuAgx heterostructures.
  • Demonstrated that the ternary sulfide phase depends on the Au:Ag ratio, influencing photocatalytic performance.

Conclusions:

  • Single-atom diffusion drives significant structural and phase changes in Au-Ag2S nanomaterials.
  • The Au:Ag ratio dictates the final ternary sulfide phase and its photocatalytic efficacy.
  • This study provides insights into controlling nanomaterial properties through controlled diffusion.