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Femtosecond Laser Direct Writing of Gecko-Inspired Switchable Adhesion Interfaces on a Flexible Substrate
Zhiang Zhang1, Bingze He2, Qingqing Han1
1Department of Automation, Shanghai Jiao Tong University, Shanghai 200240, China.
Micromachines
|September 28, 2023
Summary
Researchers developed gecko-inspired mushroom-shaped micropillars for switchable adhesion. These biomimetic switchable adhesion interfaces (BSAIs) offer controllable adhesion for micro-manipulation and bio-detection applications.
Area of Science:
- Materials Science
- Biomimetics
- Nanotechnology
Background:
- Biomimetic switchable adhesion interfaces (BSAIs) are crucial for micro-manipulation and bio-detection.
- Gecko-inspired adhesives offer adaptability but lack flexible control due to high adhesion strength.
Purpose of the Study:
- To develop a novel biomimetic switchable adhesion interface with controllable adhesion.
- To mimic gecko footpad mechanics using 3D mushroom-shaped micropillars.
Main Methods:
- Fabrication of 3D mushroom-shaped polydimethylsiloxane (PDMS) micropillars on a flexible PDMS substrate using two-photon polymerization.
- Mimicking gecko footpad bending and stretching through substrate manipulation.
- Adjusting micropillar spacing to control adhesion strength.
Main Results:
- Achieved high spatial resolution, exquisite structures, and ultra-smooth surfaces for micropillars, even with tip/stem ratios > 2.
- Demonstrated resilience withstanding 175% deformation and severe bending without collapse.
- Exhibited controllable adhesion force and rapid manipulation of liquid droplets via substrate bending and stretching.
Conclusions:
- The developed BSAIs offer precise control over adhesion strength by adjusting micropillar spacing.
- These resilient and adaptable adhesives show promise for microfluidics, micro-assembly, and flexible electronics.
