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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...

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Updated: Nov 12, 2025

A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization

A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization

Published on: August 18, 2022

Colloidal assembly by directional ice templating.

Bipul Biswas¹, Mayank Misra², Anil Singh Bisht³

¹Complex Fluid and Polymer Engineering, Polymer Science and Engineering, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pune - 411008, India. guruswamy@iitb.ac.in and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India.

|March 17, 2021

Summary

This summary is machine-generated.

Directional ice templating guides colloidal particles into clusters. Particle concentration dictates cluster size and shape, transitioning from single particles to chains and sheets, with assembly scaling dependent on freezing direction.

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Area of Science:

Materials Science
Colloid Science
Soft Matter Physics

Background:

Ice templating is a method for self-assembling colloidal particles.
Directional freezing offers control over assembly geometry.
Understanding particle interactions during freezing is crucial for material design.

Purpose of the Study:

To investigate directional ice templating of dilute aqueous colloidal particle dispersions.
To analyze the resulting particle assemblies and their scaling behavior.
To compare directional freezing with isotropic freezing methods.

Main Methods:

Coating micron-size polystyrene colloids with polyethyleneimine (PEI).
Subjecting the PEI-coated colloid dispersion to unidirectional freezing.
Performing lattice simulations to model the clustering process.

Main Results:

Directional freezing forms cross-linked particle clusters at ice crystal boundaries.
Particle volume fraction influences cluster size, ranging from single particles to chains and sheets.
Cluster size distribution follows a power law (Pn ∼ n-η) where η depends on particle concentration, unlike isotropic freezing.

Conclusions:

Directional ice templating enables controlled formation of colloidal assemblies.
The geometry of ice crystal growth significantly impacts particle aggregation and scaling laws.
Simplified lattice simulations accurately predict experimental outcomes, validating the model.