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Isolated Mesoporous Microstructures Prepared by Stress Localization-Induced Crack Manipulation

Cited 3 time in Web of Science Cited 3 time in Scopus
Authors
Wooh, Sanghyuk; Lee, Soojin; Lee, Yunchan; Ryu, Ji Ho; Lee, Won Bo; Yoon, Hyunsik; Char, Kookheon
Issue Date
2016-09-12
Publisher
AMERICAN CHEMICAL SOCIETY
Citation
ACS NANO Vol.10 No.10, pp. 9259-9266
Keywords
crack manipulationsoft lithographystress localizationdelaminationmesoporous prism(s)mesoporous pyramid(s)
Abstract
Cracks observed in brittle materials are mostly regarded as defects or failures. However, they can be a valuable tool when implemented in a controlled way. Here, we introduce a strategy to control the crack propagation of mesoporous micropatterns (prisms and pyramids), which leads to the isolation of well-defined microstructures. Mesoporous micropatterns were fabricated by the soft imprinting technique with wet TiO2 nanoparticle (NP) pastes, followed by sintering to remove organic components. Since the volume of the paste significantly shrinks during the sintering step, stress is localized at the edge of micropatterns, in good agreement with finite element method simulations, creating well-defined cracks and their propagation. It was demonstrated that the degree of stress localization is determined by the thickness of residual layers, NP size, and heating rate. After controlled crack propagation and delamination of microparticles from the substrates, mesoporous microwires and microparticles were successfully produced and functionalized from the isolated mesoporous prisms and pyramids. The method proposed in this study for controlled crack manipulation and delamination opens a door for straightforward and economical fabrication of well-defined mesoporous microparticles.
ISSN
1936-0851
Language
English
URI
https://hdl.handle.net/10371/116897
DOI
https://doi.org/10.1021/acsnano.6b03044
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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