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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...

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 the...

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Related Experiment Video

Updated: Jun 20, 2026

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates

Published on: May 9, 2014

Colloidal Nanoparticle Metasurfaces: Principles, Fabrication, and Applications.

Yazi Wang¹, Hongyan Li¹, Wei Cao¹

¹State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China.

|August 25, 2025

Summary

This summary is machine-generated.

Metasurfaces, advanced 2D metamaterials, offer unique optical properties for cloaking and imaging. Bottom-up self-assembly fabrication using colloidal nanoparticles overcomes limitations of traditional methods, enabling novel applications.

Keywords:

chirality dynamical reconfiguration holography metasurfaces nanoparticles perfect absorber self-assembly surface lattice resonance

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Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Metasurfaces are 2D metamaterials with significant optical properties.
Applications include cloaking, biophotonics, and imaging.
Fabrication techniques are crucial for realizing these applications.

Purpose of the Study:

To review the fundamentals of metasurfaces and their optical behaviors.
To highlight advances in metasurface fabrication using colloidal building blocks.
To discuss reconfigurable optical properties and emerging applications.

Main Methods:

Focus on bottom-up self-assembly methods using colloidal nanoparticles.
Comparison with conventional top-down lithography limitations (polycrystallinity, surface roughness).
Strategies for fabricating metasurfaces with controlled size, shape, crystallinity, and composition.

Main Results:

Colloidal self-assembly offers a feasible alternative to conventional lithography.
Demonstration of controlled fabrication of metasurfaces.
Highlighting reconfigurable optical properties.

Conclusions:

Metasurfaces fabricated via colloidal self-assembly show promise for advanced optical applications.
Overcoming lithography limitations is key to progress.
Future research directions in reconfigurable metasurfaces are promising.