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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...

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Updated: Jun 12, 2025

Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Synthesis and Characterization of Monolayer Colloidal Sheets.

Santosh Vasant Daware^1,2,3, Ranajit Mondal⁴, Mansi Kothari⁵

¹Department of Chemical Engineering, Indian Institute of Bombay, Mumbai 400076, India.

Langmuir : the ACS Journal of Surfaces and Colloids

|September 17, 2024

Summary

This summary is machine-generated.

Researchers developed a simple method to create colloidal sheets, which are models for 2D materials. This technique allows control over sheet properties like size and crystalline order.

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Area of Science:

Materials Science
Colloid Science
Nanotechnology

Background:

Sheet-like colloidal assemblies are crucial models for understanding two-dimensional (2D) materials.
Controlling the structure and properties of these assemblies is key for advancing 2D material research.

Purpose of the Study:

To develop a versatile and simple method for preparing colloidal monolayer sheet-like assemblies.
To investigate the influence of preparation parameters on the size, crystalline order, flexibility, and defect density of these assemblies.

Main Methods:

Utilizing a sessile drop evaporation technique on an oil-covered substrate.
Employing self-assembly of polyethyleneimine polymer-covered micrometer-sized colloidal particles at the air-water interface.
Cross-linking the polymer to create permanent colloidal assemblies.

Main Results:

Achieved control over colloidal assembly size, crystalline order, flexibility, and defect density.
Demonstrated that dispersion concentration influences assembly order (disordered at low, polycrystalline at high).
Showed that increasing cross-linker ratio decreases flexibility and introducing varied particle sizes or vacancies increases disorder.

Conclusions:

The developed method offers a versatile platform for creating tunable colloidal sheets.
These colloidal sheets serve as excellent models for studying fundamental aspects of 2D materials, including disorder, doping, and vacancies.