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Femtosecond Laser-Structured Underwater "Superpolymphobic" Surfaces
Jiale Yong1,2, Zhibing Zhan1, Subhash C Singh1
1The Institute of Optics , University of Rochester , Rochester , New York 14627 , United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|July 3, 2019
Summary
Researchers created underwater superpolymphobicity using femtosecond laser treatment. This novel surface treatment repels liquid polydimethylsiloxane (PDMS) droplets, offering significant applications in polymer adhesion and material shaping.
Area of Science:
- Materials Science
- Surface Chemistry
- Nanotechnology
Background:
- Controlling liquid-solid interactions is crucial for various applications.
- Existing methods for creating hydrophobic surfaces often fail in aqueous environments.
- Polydimethylsiloxane (PDMS) is a widely used polymer in microfluidics and biomedical devices.
Purpose of the Study:
- To develop a method for creating surfaces that repel liquid polydimethylsiloxane (PDMS) droplets underwater.
- To characterize the properties of these novel surfaces.
- To explore the potential applications of this phenomenon.
Main Methods:
- Surfaces were treated using femtosecond laser pulses.
- The wettability of the treated surfaces by liquid PDMS in water was evaluated.
- Contact angle and sliding angle measurements were performed.
Main Results:
- Femtosecond laser treatment created surfaces exhibiting underwater superpolymphobicity.
- The superpolymphobic silicon surface demonstrated a high contact angle (159 ± 1°) and low sliding angle (1.5 ± 0.5°) for PDMS droplets in water.
- This effect was achievable on various hydrophilic materials like semiconductors, glass, and metals.
Conclusions:
- Underwater superpolymphobicity effectively prevents adhesion between liquid polymers and solid substrates.
- This phenomenon holds significant potential for designing polymer-substrate adhesion, controlling polymer material shapes, and advancing polymer-based applications.
- The developed technique offers a versatile approach for surface modification in aqueous environments.