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Microcracking in Concrete

Microcracking in Concrete

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...

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Updated: Jun 13, 2025

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

Published on: January 19, 2016

Multiscale crack trapping for programmable adhesives.

Seongjin Park¹, Dong Kwan Kang¹, Donghyuk Lee¹

¹Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea.

Science Advances

|September 11, 2024

Summary

This summary is machine-generated.

This study introduces a novel hybrid adhesive with micro and macro architectures for advanced adhesion control. This innovation enhances adhesion strength and enables programmable release, leading to reusable, skin-friendly adhesive patches.

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Area of Science:

Materials Science
Adhesion Science
Biomaterials Engineering

Background:

Precise control of crack propagation in bonded interfaces is essential for developing high-performance smart adhesives.
Existing research predominantly focuses on either microscale or macroscale crack propagation, limiting comprehensive adhesion control.
A need exists for adhesives that offer multi-scale crack management for enhanced adhesion and controlled detachment.

Purpose of the Study:

To develop a hybrid adhesive integrating microarchitectures and macroscopic nonlinear cut architectures for superior adhesion control.
To achieve simultaneous crack trapping across multiple scales for high adhesion capacity.
To enable programmable release and reusability through controlled macroscale crack propagation.

Main Methods:

Integration of microarchitectures and macroscopic nonlinear cut architectures within a hybrid adhesive system.
Design enabling conformal attachment and multi-scale crack trapping.
Fabrication of skin adhesive patches with integrated electronics for functional demonstrations.

Main Results:

Adhesion enhancement exceeding 70× through multi-scale crack trapping.
Independent control over adhesion strength and directionality at any location.
Demonstration of breathable, non-damaging, strong, and easily removable skin adhesive patches.
Successful integration with electronics for motion detection and wireless signal transmission for virtual reality applications.

Conclusions:

The developed hybrid adhesive offers unparalleled adhesion control by managing crack propagation across multiple scales.
The innovative design facilitates both high adhesion capacity and programmable release, enabling reusability.
The resulting skin adhesive patches are versatile, offering a combination of strength, breathability, and gentle removal, with potential applications in wearable electronics and virtual reality.