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Colloidal precipitates

Colloidal precipitates

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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Updated: Mar 17, 2026

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Published on: March 2, 2016

Gold core@silver semishell Janus nanoparticles prepared by interfacial etching.

Limei Chen¹, Christopher P Deming, Yi Peng

¹Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, USA. Shaowei@ucsc.edu.

|July 16, 2016

Summary

Researchers developed novel gold core@silver semishell Janus nanoparticles. These nanoparticles show improved electrocatalytic activity for oxygen reduction reactions due to synergistic effects.

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Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica

Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica

Published on: July 9, 2015

Area of Science:

Nanotechnology
Materials Science
Electrochemistry

Background:

Core-shell nanoparticles are crucial in catalysis.
Janus nanoparticles offer unique surface properties.
Controlling nanoparticle asymmetry is key for advanced applications.

Purpose of the Study:

To synthesize gold core@silver semishell Janus nanoparticles.
To investigate their structural and compositional characteristics.
To evaluate their electrocatalytic performance in oxygen reduction reactions.

Main Methods:

Synthesis of Au@Ag core-shell nanoparticles via chemical deposition.
Formation of a monolayer on a water surface using Langmuir-Blodgett technique.
Selective chemical etching of the silver shell at the air/water interface using hydrogen peroxide and ammonia.
Characterization using transmission electron microscopy, UV-vis absorption, and X-ray photoelectron spectroscopy.

Main Results:

Successfully prepared gold core@silver semishell Janus nanoparticles with asymmetrical silver distribution.
Demonstrated enhanced electrocatalytic activity in oxygen reduction reactions compared to traditional core-shell nanoparticles.
Observed a synergistic effect between gold cores and silver semishells optimizing oxygen binding.

Conclusions:

The developed Janus nanoparticles present a promising platform for enhanced electrocatalysis.
Selective etching at the air/water interface is an effective method for creating asymmetric nanostructures.
The synergistic interaction in Au@Ag semishell Janus nanoparticles boosts oxygen reduction reaction efficiency.