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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...

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...

Precipitate Formation and Particle Size Control

Precipitate Formation and Particle Size Control

In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...

Crystal Growth: Principles of Crystallization

Crystal Growth: Principles of Crystallization

Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...

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...

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Related Experiment Video

Updated: Sep 4, 2025

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

Two-dimensional binary colloidal crystals formed by particles with two different sizes.

Masahide Sato¹

¹Emerging Media Initiative, Kanazawa University, Kanazawa, 920-1192, Japan. msato002@staff.kanazawa-u.ac.jp.

Scientific Reports

|July 20, 2022

Summary

This study used Monte Carlo simulations to explore the formation of 2D binary colloidal crystals. Optimal crystal structures depend on particle size ratios and inter-particle/particle-wall interactions.

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Published on: June 20, 2019

Area of Science:

Materials Science
Condensed Matter Physics
Computational Chemistry

Background:

Colloidal crystals are important in photonic applications.
Controlling the self-assembly of binary colloidal crystals is challenging.
Understanding particle interactions is key to designing ordered structures.

Purpose of the Study:

Investigate the formation of 2D binary colloidal crystals.
Examine the influence of particle size ratios on crystal structure.
Determine the role of inter-particle and particle-wall interactions.

Main Methods:

Monte Carlo simulations were employed.
Two distinct particle sizes were simulated.
Varying interaction potentials and size ratios were tested.

Main Results:

2D binary colloidal crystal structures formed efficiently when interactions between similarly sized particles were weaker than those between differently sized particles.
Achieving specific 2D structures on a wall required careful selection of particle size ratios.
Stronger attraction between particles and the wall promoted ordered structure formation.

Conclusions:

Particle size ratio and interaction strength are critical parameters for forming 2D binary colloidal crystals.
Tailoring particle-wall attraction is essential for directed self-assembly on surfaces.
Simulation results provide guidance for experimental synthesis of colloidal crystals.