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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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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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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...

Colloids

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...

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Related Experiment Video

Updated: Mar 1, 2026

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

Published on: November 4, 2021

Colloidal diffusion over a quasicrystalline-patterned surface.

Yun Su¹, Pik-Yin Lai², Bruce J Ackerson³

¹Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.

The Journal of Chemical Physics

|June 10, 2017

Summary

This summary is machine-generated.

Colloidal diffusion over quasicrystalline-patterned surfaces reveals distinct trapped and free states. Particle dynamics align with theoretical models, showcasing potential applications of engineered landscapes.

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Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Area of Science:

Physics
Materials Science
Nanotechnology

Background:

Colloidal diffusion is fundamental to many physical and chemical processes.
Engineered surfaces offer novel ways to control particle dynamics.
Quasicrystalline patterns present unique potential landscapes for particle interactions.

Purpose of the Study:

To systematically study colloidal diffusion over a substrate with quasicrystalline-patterned holes.
To investigate the influence of a quasicrystal-induced potential landscape on particle motion.
To compare experimental results with theoretical predictions for diffusion in such systems.

Main Methods:

Utilizing optical microscopy to track the trajectories of silica spheres.
Creating a gravitational potential landscape U(x, y) using patterned holes.
Simultaneously measuring potential, mean dwell time, mean square displacement, and diffusion coefficient (D_L).

Main Results:

Observed two distinct particle states: trapped within holes and free diffusion on the surface.
Measured dynamic properties including mean dwell time and mean square displacement.
Found good agreement between the measured long-time diffusion coefficient (D_L) and two theoretical models.

Conclusions:

The study successfully demonstrates control over colloidal diffusion using quasicrystalline potentials.
Experimental findings validate theoretical models for diffusion on quasicrystal lattices.
The engineered potential landscape shows promise for applications in particle manipulation and separation.