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journal article·2022-04-26

Cracking of Colloidal Films to Generate Rectangular Fragments

Yunchan Lee, Jaekyoung Kim, Soojin Lee, Sanghyuk Wooh, Hyunsik Yoon, Kookheon Char

Langmuir· Volume 38· Issue 16
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Source abstract

Abstract

Cracks are common in nature. Cracking is known as an irreversible and uncontrollable process. To control the cracking patterns, many researchers have proposed methods to prepare notches for stress localization on films. In this work, we investigate a method of controlling cracks by making microscale pyramid patterns that have notches between the pyramids. After preparing pyramid patterns consisting of colloidal particles with organic residue, we annealed them to induce volume shrinkage and cracking between the pyramids. We studied the effect of film thickness on cracking and the generation of rectangular fragments consisting of multiple pyramids. The area of rectangular fragments was in good agreement with the results of scaling analysis. The concept of controlling cracks by imprinting notches on a film and the relationship with the film thickness can guide the study of cracking phenomena.
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Research context

OpenAlex topics: Nanofabrication and Lithography Techniques · Nanomaterials and Printing Technologies · Surface Modification and Superhydrophobicity

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

The 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

Department of Chemical and Biomolecular Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea

School of Chemical Engineering & Materials Science, Chung-Ang University, Seoul 06974, Republic of Korea

Funding

National Research Foundation of Korea · Ministry of Trade, Industry and Energy · Ministry of Education, Science and Technology

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