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Mechanical Stability of PDMS-Based Micro/Nanotextured Flexible Superhydrophobic Surfaces under External Loading
Ning Wang1, Qing Wang1, Shuangshuang Xu1
1Institute of NanoEngineering, College of Civil Engineering and Architecture , Shandong University of Science and Technology , Qingdao 266590 , P. R. China.
ACS Applied Materials & Interfaces
|December 3, 2019
Summary
Flexible superhydrophobic surfaces maintain their water-repelling properties under stress. This study developed robust, self-cleaning surfaces using polydimethylsiloxane (PDMS) micro/nanostructures, ideal for flexible electronics.
Area of Science:
- Materials Science
- Surface Chemistry
- Nanotechnology
Background:
- Superhydrophobicity relies on micro/nanostructures, which are often fragile under mechanical stress.
- Maintaining superhydrophobicity in flexible surfaces during deformation is a significant challenge.
Purpose of the Study:
- To fabricate robust, superhydrophobic flexible surfaces using polydimethylsiloxane (PDMS).
- To investigate the formation mechanism of micro/nanostructures and the origin of superhydrophobicity.
- To evaluate the mechanical stability and self-cleaning properties of the fabricated surfaces.
Main Methods:
- Fabrication of PDMS-based micro/nanotextured flexible surfaces via an effective and environmentally friendly method.
- Investigation of structure formation, superhydrophobicity origin, and reaction time effects on wettability.
- Assessment of morphology and superhydrophobicity under various external loading conditions (tensile strain, bending, impact).
Main Results:
- Micro/nanotextured structures remained intact under external loading, with only the bottom layer showing cracks.
- Superhydrophobicity was preserved under tensile strain up to breakage, 500 bending cycles, and impact tests.
- Effective self-cleaning properties were demonstrated using water droplets to remove contaminants.
Conclusions:
- PDMS-based micro/nanotextured flexible surfaces exhibit robust superhydrophobicity and excellent mechanical stability.
- The developed surfaces possess significant self-cleaning capabilities.
- These surfaces show promise for applications in flexible electronic devices.
