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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...

Colloids

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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 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...

Colloidal precipitates

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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

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Micelles

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Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...

Coagulation

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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...

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Related Experiment Video

Updated: Jul 10, 2026

Facile Preparation of Internally Self-assembled Lipid Particles Stabilized by Carbon Nanotubes

Facile Preparation of Internally Self-assembled Lipid Particles Stabilized by Carbon Nanotubes

Published on: February 19, 2016

Bicontinuous emulsions stabilized solely by colloidal particles.

E M Herzig¹, K A White, A B Schofield

¹SUPA, School of Physics, University of Edinburgh, Mayfield Road, Edinburgh, UK.

Nature Materials

|November 6, 2007

Summary

Researchers developed a reproducible method to create three-dimensional bijels, a novel class of soft solids. These materials, useful for microfluidic applications, feature tunable interfaces stabilized by a single particle layer.

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Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Area of Science:

Soft matter physics
Materials science
Colloid science

Background:

Computer simulations suggest the possibility of creating bijels, a new class of soft solids, by stabilizing bicontinuous interfaces in binary liquid mixtures.
Bijels, if realized, could serve as semi-permeable micro-reaction media due to their interfacial particle layers.
Laboratory creation of bijels faces challenges, including limitations on sample thickness and reproducibility issues caused by unequal particle wettability.

Purpose of the Study:

To develop a reproducible protocol for creating three-dimensional bijel samples.
To demonstrate the tunability of interfacial properties in bijels.
To confirm the soft solid mechanical behavior of bijels.

Main Methods:

Utilizing neutrally wetted particles to stabilize bicontinuous interfaces during spinodal decomposition.
Developing a protocol to overcome limitations of fast quench rates and ensure sample three-dimensionality.
Investigating interfacial layer characteristics and mechanical properties of the synthesized bijels.

Main Results:

A reproducible protocol for creating three-dimensional bijels with interfaces stabilized by a single particle layer was established.
The mean interfacial separation in the bijels was successfully tuned.
The synthesized bijels exhibited soft solid mechanical behavior.

Conclusions:

The developed protocol enables the reproducible fabrication of three-dimensional bijels.
Tunable interfacial properties and soft solid behavior make these bijels valuable for microfluidic applications.
This work overcomes previous limitations, paving the way for practical bijel applications.