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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: Jun 23, 2026

Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method

Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method

Published on: January 15, 2012

Templating silver nanoparticle growth using phosphonated calixarenes.

Karel J Hartlieb¹, Martin Saunders, Colin L Raston

¹Centre for Strategic Nano-Fabrication, The University of Western Australia, Crawley, WA 6009, Australia.

Chemical Communications (Cambridge, England)

|May 23, 2009

Summary

This summary is machine-generated.

Researchers synthesized approximately 2 nm silver nanoparticles using p-phosphonated calixarenes. This method employs hydrogen gas as an eco-friendly reducing agent for efficient nanoparticle production.

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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

Area of Science:

Nanotechnology
Materials Science
Green Chemistry

Background:

Silver nanoparticles (AgNPs) exhibit unique properties but their synthesis often involves harsh chemicals.
Developing environmentally friendly synthesis methods for nanomaterials is crucial.

Purpose of the Study:

To develop a facile and green method for synthesizing very small silver nanoparticles.
To utilize p-phosphonated calixarenes as dual-purpose agents in nanoparticle synthesis.

Main Methods:

Employing p-phosphonated calixarenes as both templating agents and surfactants.
Using hydrogen gas as a green reductant for silver precursor reduction.
Characterizing the resulting silver nanoparticles for size and morphology.

Main Results:

Successfully synthesized approximately 2 nm silver nanoparticles.
Demonstrated the efficacy of p-phosphonated calixarenes in controlling nanoparticle size.
Confirmed the environmentally benign nature of the synthesis process using hydrogen gas.

Conclusions:

P-phosphonated calixarenes are effective in the green synthesis of small silver nanoparticles.
Hydrogen gas provides an efficient and eco-friendly reduction pathway.
This method offers a scalable approach for producing well-defined silver nanoparticles.