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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...

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...

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...

Coagulation

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...

Ion Exchange

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...

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: May 5, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 21, 2014

Ionic colloidal crystals of oppositely charged particles.

Mirjam E Leunissen¹, Christina G Christova, Antti-Pekka Hynninen

¹Soft Condensed Matter, Debye Institute, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands. M.E.Leunissen@phys.uu.nl

|September 9, 2005

Summary

Researchers demonstrate tunable electrostatic interactions in colloidal suspensions, enabling the formation of stable ionic colloidal crystals. This breakthrough allows for diverse binary structures and offers new avenues for studying ionic phase behavior and creating advanced photonic materials.

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Area of Science:

Colloidal science
Soft matter physics
Materials science

Background:

Colloidal suspensions mimic atomic/molecular phase behavior (melting, freezing, glass transitions) due to their observable particle sizes.
Various colloidal interactions (repulsive, attractive, hard-sphere, dipolar) yield equilibrium phases.
Long-range attractions, like ionic interactions, typically cause irreversible aggregation in colloidal systems.

Purpose of the Study:

To investigate the formation of stable ionic colloidal crystals by tuning electrostatic interactions between oppositely charged particles.
To explore the resulting crystal structures and their properties, contrasting them with atomic systems.
To demonstrate the potential of these colloidal crystals for applications in advanced materials.

Main Methods:

Theoretical modeling and computer simulations to confirm the stability of predicted ionic colloidal crystal structures.
Experimental manipulation of electrostatic interactions between oppositely charged colloidal particles.
Application of an external electric field to induce melting of the formed crystals.

Main Results:

Successfully formed large ionic colloidal crystals by tuning electrostatic interactions between oppositely charged particles.
Discovered that crystal stoichiometry is not dictated by charge neutrality, leading to diverse binary structures.
Confirmed crystal stability through theory and simulations, and demonstrated reversibility (melting) with an electric field.

Conclusions:

Tunable electrostatic interactions enable the formation of stable, diverse ionic colloidal crystals, overcoming previous aggregation limitations.
Colloidal model systems can effectively study the phase behavior of ionic species.
This approach facilitates the production of binary crystals for potential use in photonic applications.