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Colloidal precipitates

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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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Related Experiment Video

Updated: Mar 6, 2026

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

Suppressing Crack Formation in Particulate Systems by Utilizing Capillary Forces.

Monica Schneider¹, Johannes Maurath¹, Steffen B Fischer^1,2

¹Institute for Mechanical Process Engineering and Mechanics, Karlsruhe Institute of Technology , Gotthard-Franz-Straße 3, 76131 Karlsruhe, Germany.

ACS Applied Materials & Interfaces

|March 7, 2017

Summary

This summary is machine-generated.

Cracks in drying particulate films are prevented by adding a second liquid to suspensions. This capillary suspension method enables thicker, crack-free films for applications like printed electronics.

Keywords:

capillary suspensions crack formation drying solvent effects wetting

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Area of Science:

Materials Science
Chemical Engineering
Physics of Colloids

Background:

Drying-induced cracks in particulate films compromise product integrity and functionality.
Hard particle suspensions are particularly prone to cracking during the drying process.

Purpose of the Study:

To develop a universal method for suppressing crack formation in thin films derived from hard particle suspensions.
To enhance the mechanical stability and processing capabilities of particulate films.

Main Methods:

Introduction of a trace amount of an immiscible secondary liquid into the primary suspension.
Utilizing capillary forces between particles, enhanced by the secondary liquid, to maintain particle cohesion.
Modifying film structure and accelerating the drying rate.

Main Results:

Successfully suppressed crack formation in thin films made from hard particle suspensions.
Enabled the production of crack-free films at thicknesses significantly exceeding the critical cracking thickness.
Crack suppression persisted even after the sintering process.

Conclusions:

The capillary suspension strategy offers a generic and effective approach to prevent cracking in particulate films.
This method is broadly applicable across various material types (metals, oxides, polymers) and easily integrated into industrial processes.
Potential applications include advanced ceramic foils and printed electronic devices.