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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...

Recrystallization: Solid–Solution Equilibria

Recrystallization: Solid–Solution Equilibria

Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...

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...

Solid–Solid Solutions

Solid–Solid Solutions

The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.

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...

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Related Experiment Video

Updated: Jun 29, 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

Colloidal ordering from phase separation in a liquid-crystalline continuous phase

Loudet¹, Barois, Poulin

¹Centre de Recherche Paul Pascal/CNRS, Pessac, France.

|October 18, 2000

Summary

This summary is machine-generated.

Binary mixtures with liquid crystals self-organize into ordered droplet chains, not full separation. This controlled self-assembly offers potential for novel materials with unique optical and rheological properties.

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Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals

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Area of Science:

Materials Science
Soft Matter Physics
Physical Chemistry

Background:

Phase separation in binary mixtures is temperature-dependent, leading to particle formation and coarsening.
Liquid crystal (LC) systems are of interest for electro-optical properties when dispersed in isotropic matrices.
Understanding self-organization in LC mixtures is crucial for advanced material design.

Purpose of the Study:

To investigate the self-organization behavior of binary mixtures composed of an isotropic fluid and a liquid crystal.
To explore the formation of ordered structures beyond simple phase separation.
To identify the factors controlling droplet size and spatial arrangement in these systems.

Main Methods:

Rapid cooling of binary mixtures of isotropic fluid and liquid crystal.
Observation and analysis of droplet formation, size, and spatial distribution.
Investigation of the role of orientational elasticity and defect formation in liquid crystal phases.

Main Results:

The binary mixture self-organizes into highly ordered arrays of monodisperse colloidal droplet chains.
Complete phase separation is inhibited, resulting in ordered structures instead of distinct bulk phases.
Droplet size and organization are governed by the liquid crystal's orientational elasticity and critical defect sizes.

Conclusions:

Binary mixtures of isotropic fluids and liquid crystals can self-organize into ordered colloidal droplet chains.
This controlled self-assembly offers a pathway to design ordered composites with tunable properties.
The findings suggest potential applications in advanced materials with tailored rheological and optical characteristics.