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Related Concept Videos

Microcracking in Concrete01:20

Microcracking in Concrete

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Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
527

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Isolated Mesoporous Microstructures Prepared by Stress Localization-Induced Crack Manipulation.

Sanghyuk Wooh1, Soojin Lee1, Yunchan 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.

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Summary

Researchers controlled crack propagation in mesoporous micropatterns, enabling the isolation of well-defined microstructures. This method offers a new way to fabricate mesoporous microparticles and microwires economically.

Keywords:
crack manipulationdelaminationmesoporous prism(s)mesoporous pyramid(s)soft lithographystress localization

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Cracks in brittle materials are typically viewed as defects.
  • Controlled crack propagation offers potential for novel material fabrication.

Purpose of the Study:

  • To develop a strategy for controlling crack propagation in mesoporous micropatterns.
  • To enable the isolation of well-defined microstructures for microparticle fabrication.

Main Methods:

  • Fabrication of mesoporous micropatterns using soft imprinting with titanium dioxide (TiO2) nanoparticle pastes.
  • Controlled sintering to induce stress localization and crack propagation.
  • Finite element method simulations to understand stress distribution.

Main Results:

  • Successfully controlled crack propagation and delamination in mesoporous prisms and pyramids.
  • Produced well-defined mesoporous microwires and microparticles.
  • Demonstrated that stress localization depends on residual layer thickness, nanoparticle size, and heating rate.

Conclusions:

  • A novel method for controlled crack manipulation and delamination was established.
  • This approach facilitates straightforward and economical fabrication of mesoporous microparticles.
  • The technique opens avenues for producing functionalized mesoporous microstructures.