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Wettability-Switchable Azobenzene Inverse Opal Film via Interfacial Engineering
Junchao Liu1, Chenfang Zhang1, Haoxuan He1
1School of Sciences, Xi'an University of Technology, Xi'an 710048, China.
ACS Applied Materials & Interfaces
|August 20, 2025
Summary
Researchers developed a novel azobenzene inverse opal film that reversibly switches surface wettability and droplet adhesion. This smart coating offers programmable control over droplet behavior for advanced fluidic devices and self-cleaning applications.
Area of Science:
- Materials Science
- Surface Chemistry
- Nanotechnology
Background:
- Precise control over surface wettability is crucial for advanced fluidic devices.
- Existing methods often face limitations in modulation range, reversibility, or fabrication complexity.
Purpose of the Study:
- To develop a material with reversible wettability and adhesion switching capabilities.
- To address the limitations of current wettability modulation techniques.
Main Methods:
- Fabrication of an azobenzene inverse opal film.
- Utilizing UV/vis irradiation to induce reversible trans-cis photoisomerization.
- Characterizing surface energy, sliding angles, and droplet dynamics.
Main Results:
- The film exhibited reversible wettability and adhesion switching upon alternating UV/vis light exposure.
- Surface energy increased from 22.0 to 33.5 mJ/m², with sliding angles changing from 17° to 25°.
- Demonstrated programmable droplet mobility, switching between rolling and pinning behaviors.
Conclusions:
- The azobenzene inverse opal film provides a lubricant-free, non-lithographic method for controllable, reversible wettability.
- This technology holds promise for smart coatings, self-cleaning materials, and photonic fluidic devices.
