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Adhesion

Adhesion

Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow glass...

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Structurally-colored adhesives for sensitive, high-resolution, and non-invasive adhesion self-monitoring.

Quanqian Lyu¹, Miaomiao Li¹, Lianbin Zhang²

¹State Key Laboratory of Material Processing and Die & Mould Technology and School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST), Wuhan, China.

Nature Communications

|September 28, 2024

Summary

New structurally-colored adhesives offer real-time, non-invasive monitoring of adhesion. These smart materials change color to detect deformation and failure, crucial for structural health monitoring.

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Area of Science:

Materials Science
Nanotechnology
Adhesion Science

Background:

Polymeric adhesives are vital in diverse applications, including medical implants and soft robotics.
Real-time monitoring of adhesive performance is crucial to prevent premature failure, yet remains a significant challenge.

Purpose of the Study:

To develop structurally-colored adhesives for sensitive, high-resolution, non-invasive self-monitoring of adhesion.
To enable early detection of deformation and debonding through distinct color changes.

Main Methods:

Integration of one-dimensional photonic nanochains into acrylate-copolymer-based adhesives.
Utilizing a nanochain tilting mechanism under shear to induce distinct color changes.
Customization for pressure-sensitive and structural adhesive applications.

Main Results:

Demonstrated ultrafast response (<60 ms), high sensitivity, and high resolution (~120 μm) in color change.
Achieved accurate prediction of adhesion states and failure (up to 97.2%) using imaging and machine learning.
Structurally-colored adhesives exhibit a unique tilting mechanism for color change under shear stress.

Conclusions:

Structurally-colored adhesives provide a practical solution for real-time adhesion self-monitoring.
This technology offers a new paradigm for structural health monitoring in the Internet of Things (IoT) era.
The developed adhesives enable sensitive detection of subtle deformation and debonding.