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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

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...

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...

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...

Solubility

Solubility

Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...

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Related Experiment Video

Updated: Jun 14, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Lock and key colloids.

S Sacanna¹, W T M Irvine, P M Chaikin

¹Department of Physics, New York University, 4 Washington Place, New York, New York 10003, USA. s.sacanna@nyu.edu

|March 26, 2010

Summary

This summary is machine-generated.

Researchers developed a novel lock-and-key system using shaped colloidal particles for programmable self-assembly. This method offers flexible bonds for creating complex colloidal structures and materials.

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Published on: March 9, 2010

Area of Science:

Materials Science
Colloid Science
Nanotechnology

Background:

Colloidal self-assembly offers a route to creating functional materials.
DNA hybridization has been used to direct particle assembly.
Existing methods require specific programming of DNA strands on particles.

Purpose of the Study:

To demonstrate an alternative recognition mechanism for colloidal self-assembly.
To utilize complementary particle shapes for directed assembly.
To create tunable and reversible binding interactions.

Main Methods:

Employing colloidal spheres as 'keys' and particles with spherical cavities as 'locks'.
Utilizing the depletion interaction for spontaneous and reversible binding.
Controlling binding specificity through size matching between key particles and lock cavities.

Main Results:

Demonstrated specific lock-and-key binding based on size complementarity.
Achieved tunable binding strength by adjusting solution composition and temperature.
Successfully produced flexible dimeric, trimeric, tetrameric colloidal molecules, and complex polymers.

Conclusions:

The lock-and-key mechanism provides a programmable route for colloidal self-assembly.
This approach enables the creation of novel composite structures with flexible bonds.
The method is expected to have broad applications in directed colloidal assembly.