Sunflower-Inspired Superhydrophobic Surface with Composite Structured Microcone Array for Anisotropy Liquid/Ice...

Area of Science:

• Surface science
• Materials science
• Biomimetics

Background:

• Controlling droplet motion on surfaces is crucial for applications like self-cleaning and drug delivery.
• Anisotropic 3D functional surfaces offer potential but face challenges in precise trajectory control.

Purpose of the Study:

• To engineer a novel surface for programmable directional control of droplet motion.
• To investigate the droplet dynamics and functional properties of the developed surface.

Main Methods:

• Fabrication of a nanoneedle-modified microcone array surface (NMAS) using nanosecond laser engraving and electroforming.
• Surface fluorination and programmable adjustment of microcone geometry and inclination angle.
• Observation and analysis of droplet bouncing trajectories and behaviors.

Main Results:

• Achieved precise, programmable control over droplet bouncing trajectories, including gravity-defying hopping and directional transport.
• Demonstrated delayed freezing and anti-freezing properties of the NMAS.
• Confirmed potential for applications in self-cleaning, droplet capture, and anti-icing.

Conclusions:

• The NMAS provides a novel method for directional droplet transport on biomimetic surfaces.
• The surface exhibits unique properties beneficial for anti-icing and microfluidic applications.
• Programmable control of droplet motion opens new avenues for functional surface design.