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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...

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...

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Updated: Jun 17, 2025

Methods for the Self-integration of Megamolecular Biopolymers on the Drying Air-LC Interface

Methods for the Self-integration of Megamolecular Biopolymers on the Drying Air-LC Interface

Published on: April 7, 2017

Soft colloidal monolayers with reflection symmetry through confined drying.

Sanjib Majumder^1,2, Madivala G Basavaraj^3,2, Dillip K Satapathy^1,2

¹Soft Material Laboratory, Department of Physics, IIT Madras Chennai-600036 India.

Nanoscale Advances

|August 14, 2024

Summary

Researchers explored colloidal monolayer formation using drying droplets confined between plates. They observed unique catenoid shapes and symmetric deposit patterns, revealing insights into particle assembly for functional materials.

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Last Updated: Jun 17, 2025

Methods for the Self-integration of Megamolecular Biopolymers on the Drying Air-LC Interface

Methods for the Self-integration of Megamolecular Biopolymers on the Drying Air-LC Interface

Published on: April 7, 2017

Fabrication of Zero Mode Waveguides for High Concentration Single Molecule Microscopy

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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 and surface science
Materials science
Nanotechnology

Background:

Colloidal monolayers are crucial for advanced materials.
Understanding their formation is key for surface modification and nanoparticle assembly.
Controlled fabrication methods are needed for functional materials.

Purpose of the Study:

To investigate the formation of colloidal monolayers from drying droplets confined between parallel plates.
To analyze the evaporation kinetics and resulting microstructural features of the deposited colloidal patterns.
To understand the influence of confinement and particle concentration on the self-assembly process.

Main Methods:

Drying an aqueous droplet containing soft colloids confined between two hydrophilic parallel plates.
Analyzing the kinetics of evaporation and droplet shape evolution (catenoid configuration).
Quantifying microstructural features of dried deposits (particle density, inter-particle separation, order parameters).

Main Results:

Droplets adopt a catenoid shape during drying, which divides into daughter droplets.
The three-phase contact line exhibits pinned and slipping behavior.
Deposited patterns show reflection symmetry with unique microstructural features.
Microstructure parameters vary with plate spacing and initial particle concentration.

Conclusions:

Confined evaporation offers a novel route to fabricate colloidal monolayers with controlled microstructures.
The observed phenomena (catenoid shape, contact line dynamics) dictate the symmetry and features of the final deposit.
This method provides a pathway for designing functional materials through precise nanoparticle assembly.