Self-propelled Leidenfrost droplets on femtosecond-laser-induced surface with periodic hydrophobicity gradient

Li, Bohong; Jiang, Lan; Li, Xiaowei; Wang, Zhipeng; Yi, Peng

doi:10.1088/2631-7990/ad18fb

Int. J. Extrem. Manuf.

2024

DOI: 10.1088/2631-7990/ad18fb

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Self-propelled Leidenfrost droplets on femtosecond-laser-induced surface with periodic hydrophobicity gradient

Bohong Li,

Lan Jiang,

Xiaowei Li

et al.

Abstract: Highlights A surface with periodic hydrophobicity gradient (SPHG) is fabricated by shaped femtosecond laser. The directional self-propulsion of the Leidenfrost droplets is realized. The viscous gradient force between gas and liquid is used to drive the droplet to move. … Show more

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Cited by 4 publications

References 41 publications

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High‐Quality Micropattern Printing by Complex‐Amplitude Modulation Holographic Femtosecond Laser

Li,

Jiang,

Wang

et al. 2024

Advanced Optical Materials

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Holographic femtosecond laser printing technology is widely used in the fabrication of micropatterns because of its high efficiency and flexibility. However, speckle noise and energy fluctuations limit the quality of the printed structure. In this study, an improved complex‐amplitude modulation holographic femtosecond laser printing method for high‐quality micropattern fabrication is proposed. The holographic light field is divided into a signal area and a surrounding noise area. To improve laser uniformity, phase modulation is applied in the signal region to eliminate the speckle noise caused by unconstrained phase interference, and weighted amplitude modulation is introduced in the signal area to improve the calculation accuracy. To precisely control laser energy density, weighted energy efficiency modulation is introduced in the noise region to disperse the energy that exceeds the material damage threshold. Under the synergistic control of laser uniformity and energy density, high‐quality micro‐pattern structures are printed efficiently. A high‐quality millimeter‐sized multifocal zone plate with micron accuracy is fabricated with the splicing printing method, demonstrating the potential of micropattern processing and the fabrication of functional devices such as binary optics.

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High‐Quality Micropattern Printing by Complex‐Amplitude Modulation Holographic Femtosecond Laser

Li,

Jiang,

Wang

et al. 2024

Advanced Optical Materials

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Research advances in bio-inspired superhydrophobic surface: Bridging nature to practical applications

Zhang,

Ji,

Yan

et al. 2024

Journal of Industrial and Engineering Chemistry

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Femtosecond laser-produced heterogeneous wettability surfaces for turning Leidenfrost drop spinning

Liu,

Yin,

Yang

et al. 2024

Applied Physics Letters

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Liquid droplets on superheated surfaces produce the Leidenfrost effect. This phenomenon might lead to droplet manipulation and control strategies in microfluidics and thermal management. However, Leidenfrost droplets move randomly and irregularly on superheated surfaces and the manufacturing of special surfaces to control Leidenfrost droplet movement poses great challenges. Here, we propose a simple and environment-friendly method to create heterogeneously wetting surface structures to control the spin motion of droplets on superheated brass using femtosecond laser patterning. The water contact angle of the superhydrophobic area on the surface was ∼160°, and the superhydrophilic area showed ∼7°. A z-shaped pattern was fabricated, which segmented the vapor film and influenced gas flow, and it resulted in the spinning of oval-shaped droplets analogous to a spinning egg. We used simulation to explain this phenomenon and also expanded the application of this droplet control in accelerating dissolution of solids and mechanical driving. This study provides the basis for a creative control method using the Leidenfrost droplet phenomenon, which has broad implications in steam-driven droplet motion and future fluid manipulation.

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Self-propelled Leidenfrost droplets on femtosecond-laser-induced surface with periodic hydrophobicity gradient

Abstract: Highlights A surface with periodic hydrophobicity gradient (SPHG) is fabricated by shaped femtosecond laser. The directional self-propulsion of the Leidenfrost droplets is realized. The viscous gradient force between gas and liquid is used to drive the droplet to move. … Show more

Cited by 4 publications

References 41 publications

High‐Quality Micropattern Printing by Complex‐Amplitude Modulation Holographic Femtosecond Laser

High‐Quality Micropattern Printing by Complex‐Amplitude Modulation Holographic Femtosecond Laser

Research advances in bio-inspired superhydrophobic surface: Bridging nature to practical applications

Femtosecond laser-produced heterogeneous wettability surfaces for turning Leidenfrost drop spinning

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