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The Colloidal State

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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...

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Updated: Mar 27, 2026

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

Published on: November 4, 2021

Colloidal assembly by ice templating.

Guruswamy Kumaraswamy¹, Bipul Biswas¹, Chandan Kumar Choudhury¹

¹Complex Fluids and Polymer Engineering, Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India. g.kumaraswamy@ncl.res.in.

Faraday Discussions

|January 20, 2016

Summary

This summary is machine-generated.

Ice templating of colloidal dispersions creates particle clusters. Cluster size distribution is weakly dependent on concentration, governed by particle exclusion at ice boundaries.

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Area of Science:

Materials Science
Colloid Science
Physical Chemistry

Background:

Ice templating is a method for fabricating ordered materials.
Colloidal dispersions are widely used in materials synthesis.
Controlling particle assembly in dilute systems is challenging.

Purpose of the Study:

To investigate colloidal particle clustering in dilute aqueous dispersions using ice templating.
To understand the relationship between particle concentration and cluster formation.
To identify the primary mechanisms governing cluster assembly.

Main Methods:

Aqueous dispersions of polymer-coated colloids and crosslinkers were prepared.
Dispersions were subjected to freezing (ice templating).
Kinetic simulations were employed to model cluster formation.

Main Results:

A transition from isolated particles to larger clusters (linear or sheet-like) was observed with increasing particle concentration (10^6 to 10^8 particles/mL).
Cluster size distribution for small clusters (<30 particles) and linear clusters showed weak dependence on dispersion concentration.
Kinetic simulations without hydrodynamics or ice front instabilities accurately captured key cluster formation features.

Conclusions:

Ice templating of dilute colloidal dispersions leads to particle clustering.
Particle exclusion by growing ice crystals is the dominant mechanism for cluster formation.
The observed clustering is largely independent of hydrodynamics and ice growth instabilities.