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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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Defect-mediated ripening of core-shell nanostructures.

Qiubo Zhang1, Xinxing Peng2, Yifan Nie1

  • 1Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.

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|April 26, 2022
PubMed
Summary
This summary is machine-generated.

Defect-mediated ripening of cadmium-cadmium chloride core-shell nanoparticles (CSN) in solution was observed. Crack defects in the shell facilitate ion diffusion and nanoparticle growth, leading to highly crystalline structures.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Understanding nanostructure ripening is crucial for controlling material properties and applications.
  • Direct observation of atomic pathways during solution-phase ripening remains challenging.

Purpose of the Study:

  • To elucidate the defect-mediated ripening mechanisms of cadmium-cadmium chloride core-shell nanoparticles (CSN) in solution.
  • To provide direct atomic-level insights into nanoparticle growth dynamics.

Main Methods:

  • In-situ atomic resolution imaging using liquid cell transmission electron microscopy (LCTEM).
  • Observation of dynamic processes at the nanoscale in a liquid environment.

Main Results:

  • Ripening initiated by dissolution of nanoparticles with incomplete shells, exposing the cadmium core to etching.
  • Nanoparticle growth facilitated by crack defect formation in the cadmium chloride shell, enabling ion diffusion.
  • Observed crack defect healing, leading to the formation of highly crystalline CSN.

Conclusions:

  • Defect dynamics, including formation, annihilation, and healing of crack defects in the shell, are key to mediating CSN ripening.
  • Disordering and crystallization of the shell structure play a significant role in the ripening process.
  • This study provides a direct atomic-scale understanding of solution-phase nanostructure ripening.