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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...

Van der Waals Interactions

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.

First Law: Particles in Two-dimensional Equilibrium

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Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
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First Law: Particles in One-dimensional Equilibrium

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Colloidal precipitates

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Related Experiment Video

Updated: May 15, 2026

Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Entropy favours open colloidal lattices.

Xiaoming Mao¹, Qian Chen, Steve Granick

¹Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Philadelphia 19104, USA. maox@umich.edu

Nature Materials

|January 15, 2013

Summary

Entropy stabilizes open colloidal lattices, not just close-packed ones. This finding, supported by theory and experiments, guides the creation of novel self-assembled structures by controlling temperature, pressure, and particle patch size.

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Synthesis and Characterization of Supramolecular Colloids

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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

Area of Science:

Colloid science
Materials science
Statistical mechanics

Background:

Ongoing research explores self-assembled colloidal structures beyond close-packed arrangements.
Understanding the stability of non-close-packed structures is crucial for designing novel materials.

Purpose of the Study:

To reveal the fundamental role of entropy in stabilizing open colloidal lattices.
To develop an analytical theory for predicting the phase behavior of colloidal assemblies.

Main Methods:

Developed an analytical theory based on lattice dynamics.
Supported theoretical predictions with experimental validation.
Investigated entropy contributions from rotational and vibrational modes of patchy colloids.

Main Results:

Demonstrated that entropy can stabilize open lattices, challenging the close-packing paradigm.
The theory predicts the dependence of phase diagrams on temperature, pressure, and patch size.
Identified conditions for the stability of targeted 2D and 3D patchy colloidal assemblies.

Conclusions:

Entropy plays a critical role in the formation of diverse colloidal structures.
The developed theory provides a framework for designing and controlling self-assembled colloidal materials.
Overcomes limitations in experimental and simulation exploration of parameter space for colloidal assembly.