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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...

Metallic Solids

Metallic Solids

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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....

The Colloidal State

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...

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Related Experiment Video

Updated: Mar 13, 2026

Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Metal-Cluster-Based Colloidal Excimer Superstructures.

Zhuolei Zhang¹, Shenqiang Ren¹

¹Department of Mechanical Engineering and Temple Materials Institute, Temple University, Philadelphia, PA, 19122, USA.

Angewandte Chemie (International Ed. in English)

|October 21, 2016

Summary

This summary is machine-generated.

Researchers created luminescent networks using colloidal gold clusters. These superstructures exhibit unique optical and electronic properties due to excimer formation facilitated by ligand hydrogen bonding.

Keywords:

colloids excimers metal nanoparticles nanoclusters

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Area of Science:

Materials Science
Nanotechnology
Photochemistry

Background:

Colloidal superstructures offer unique properties.
Excimer formation is key to novel optical and electronic behavior.
Gold nanoclusters are promising building blocks for advanced materials.

Purpose of the Study:

To describe the formation and properties of luminescent colloidal excimer superstructures.
To investigate the role of ligand-mediated interactions in superstructure assembly.
To explore the potential applications of these novel materials.

Main Methods:

Synthesis of colloidal gold clusters with specific capping ligands.
Characterization of superstructure formation using spectroscopic techniques.
Analysis of optical and electronic properties of the assembled materials.

Main Results:

Successfully formed colloidal excimer superstructures from ground-state gold cluster cores.
Demonstrated that hydrogen bonding between capping ligands drives superstructure assembly.
Observed unique optical and electronic properties arising from excimer formation within the superstructures.

Conclusions:

Colloidal excimer superstructures can be assembled through ligand-directed self-assembly.
Hydrogen-bonding networks are crucial for stabilizing these superstructures and enabling excimer formation.
These findings open avenues for designing new luminescent nanomaterials with tunable properties.