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Regulating surface wrinkles using light.

Liangwei Zhou¹, Kaiming Hu², Wenming Zhang²

¹School of Chemistry & Chemical Engineering, State Key Laboratory for Metal Matrix Composite Materials, Shanghai Jiao Tong University, Shanghai 200240, China.

National Science Review

|October 25, 2021

Summary

This study introduces a novel light-controlled method to precisely manipulate surface wrinkles, including their direction and location. This breakthrough enables dynamic control over wrinkle characteristics for advanced material fabrication.

Keywords:

dynamic light diffraction ordered wrinkles photodimerization reversible buckling surface patterns

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Area of Science:

Materials Science
Surface Engineering
Nanotechnology

Background:

Controlling micro and nano wrinkle structures on surfaces is crucial but challenging.
Precisely modulating wrinkle direction and location on demand remains a significant hurdle.

Purpose of the Study:

To develop a novel light-controlled strategy for dynamic and precise regulation of surface wrinkle characteristics.
To enable arbitrary tuning of wrinkle topographies in two dimensions (2D).

Main Methods:

A light-controlled strategy was employed to manipulate surface wrinkles.
A modified theoretical model was developed, considering bidirectional Poisson's effect and soft boundary conditions.
The model reveals the mechanical mechanism behind stress distribution and wrinkle characteristic regulation.

Main Results:

Demonstrated dynamic and precise regulation of wrinkle wavelength, amplitude, direction, and location.
Achieved arbitrary 2D tuning of wrinkle topographies.
Developed a theoretical model explaining the light-controlled regulation mechanism.

Conclusions:

The proposed light-controlled strategy offers unprecedented control over surface wrinkle characteristics.
The developed 2D ordered wrinkles serve as dynamic optical gratings and smart templates.
This research paves the way for advanced wrinkle regulation and functional wrinkled surface fabrication.