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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: Sep 27, 2025

Forming Micro-and Nano-Plastics from Agricultural Plastic Films for Employment in Fundamental Research Studies

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Cracking of Colloidal Films to Generate Rectangular Fragments.

Yunchan Lee¹, Jaekyoung Kim², Soojin Lee¹

¹The National Creative Research Initiative Center for Intelligent Hybrids, The World Class University Program for Chemical Convergence for Energy and Environment, School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Republic of Korea.

Langmuir : the ACS Journal of Surfaces and Colloids

|April 11, 2022

Summary

Researchers developed a method to control natural cracking by creating microscale pyramid patterns on films. This technique localizes stress, enabling predictable crack formation and generating uniform rectangular fragments.

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Published on: June 20, 2019

Area of Science:

Materials Science
Surface Engineering
Fracture Mechanics

Background:

Cracking is a common, yet largely uncontrollable, natural phenomenon.
Previous research focused on creating notches for stress localization to manage crack patterns.
A need exists for reliable methods to control crack propagation in thin films.

Purpose of the Study:

To investigate a novel method for controlling crack patterns in thin films.
To utilize microscale pyramid patterns as a means of inducing controlled cracking.
To explore the influence of film thickness on crack formation and fragment generation.

Main Methods:

Fabrication of microscale pyramid patterns on films using colloidal particles and organic residue.
Annealing the patterned films to induce controlled volume shrinkage and subsequent cracking.
Analysis of the effect of film thickness on cracking behavior and fragment characteristics.

Main Results:

Successfully induced controlled cracking by creating notches between microscale pyramids.
Observed the generation of uniform, rectangular fragments composed of multiple pyramids.
Demonstrated good agreement between the area of generated fragments and scaling analysis predictions.

Conclusions:

The imprinting of notches via pyramid patterns offers a viable strategy for controlling film cracking.
Film thickness plays a significant role in the resulting crack patterns and fragment dimensions.
This approach provides a framework for guiding future research into controlled fracture phenomena.