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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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Related Experiment Video

Updated: Mar 17, 2026

Compact Quantum Dots for Single-molecule Imaging

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Colloidal CdSe Quantum Rings.

Igor Fedin¹, Dmitri V Talapin^1,2

¹Department of Chemistry and James Franck Institute, The University of Chicago , Chicago, Illinois 60637, United States.

Journal of the American Chemical Society

|July 22, 2016

Summary

This summary is machine-generated.

Researchers synthesized luminescent colloidal cadmium selenide (CdSe) nanorings with complex toroidal topologies. This breakthrough enables new possibilities for advanced magneto-optical applications.

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Last Updated: Mar 17, 2026

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Area of Science:

Materials Science
Nanotechnology
Quantum Physics

Background:

Semiconductor quantum rings exhibit unique properties due to their topology.
Achieving toroidal topology in colloidal nanocrystals is challenging.

Purpose of the Study:

To synthesize luminescent colloidal semiconductor nanorings with toroidal topology.
To explore the formation mechanism and potential applications of these nanostructures.

Main Methods:

Controlled etching of two-dimensional nanoplatelets.
Observation of nanoring formation through rearrangement.

Main Results:

Successful synthesis of luminescent colloidal CdSe nanorings.
Demonstration of double and triple toroidal topologies.
Proposed mechanism for nanoplatelet-to-nanoring transformation.

Conclusions:

Colloidal nanorings with toroidal topology are achievable.
These nanostructures offer potential for magneto-optical devices, including those exploiting the Aharonov-Bohm effect.