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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...

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...

Colloids and Suspensions

Colloids and Suspensions

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...

Phase Transitions: Melting and Freezing

Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...

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Related Experiment Video

Updated: Jul 4, 2026

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers

Published on: September 4, 2015

Phase diagram for stimulus-responsive materials containing dipolar colloidal particles.

Amit Goyal¹, Carol K Hall, Orlin D Velev

¹Department of Chemical and Bimolecular Engineering, North Carolina State University, Raleigh, North Carolina, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|June 4, 2008

Summary

This summary is machine-generated.

Dipolar colloidal particles self-assemble into diverse microstructures like crystals and gels. These findings in ordered and gel phases offer potential for advanced materials.

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Last Updated: Jul 4, 2026

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers

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Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Area of Science:

Colloid Science
Materials Science
Computational Physics

Background:

Colloidal particles with permanent dipole moments exhibit complex self-assembly behaviors.
Understanding these self-assembly processes is crucial for designing novel materials.

Purpose of the Study:

To explore the self-assembly, structure, crystallization, and gelation of dipolar colloidal systems.
To map the phase diagram of these systems in the temperature-packing fraction plane.

Main Methods:

Molecular dynamics computer simulations were employed.
Particle-particle interactions were modeled using a discontinuous potential.
The phase diagram was calculated based on temperature and packing fraction.

Main Results:

Diverse phases were identified, including ordered crystalline structures (face-centered-cubic, hexagonal-close-packed, body-centered-tetragonal) at high packing fractions.
Fluid, string-fluid, and gel phases were observed at lower packing fractions.
Very low volume fraction gels and well-ordered crystals were found.

Conclusions:

Dipolar colloidal systems demonstrate a rich phase behavior, forming various microstructures.
The identified ordered crystal and low-volume fraction gel phases show promise for advanced materials applications.