Enhanced Fog Capture Using Hydrophobic 3D-Printed Micropillar Arrays.

Area of Science:

• Materials Science
• Surface Chemistry
• Bioinspired Engineering

Background:

• The escalating global freshwater crisis necessitates innovative water harvesting solutions.
• Conventional water resources are diminishing, particularly in arid and semi-arid regions.
• Atmospheric water harvesting, especially fog collection, offers a promising alternative.

Purpose of the Study:

• To develop a bioinspired atmospheric water harvesting platform overcoming limitations in fog collection.
• To enhance fog nucleation, condensation, and droplet transport efficiency.
• To create a scalable solution for regions facing water scarcity.

Main Methods:

• Fabrication of cylindrical micropillar arrays with hierarchical textures using 3D printing.
• Surface modification via hydrophobic functionalization and nonadecane infusion to create lubricant-infused slippery surfaces.
• Performance evaluation under controlled conditions, including fog-harvesting rate measurements and force-resolved analysis.

Main Results:

• The nonadecane-infused micropillar architecture (NMP3) demonstrated significantly improved fog-harvesting rates (approximately 3.6 mL h^-1).
• Enhanced droplet shedding and directional transport were achieved due to suppressed pinning forces.
• The bioinspired design balanced surface energy for efficient water collection and mobility.

Conclusions:

• The integration of additive manufacturing and lubricant-infused surfaces offers a powerful strategy for high-performance fog harvesting.
• This approach provides a scalable pathway for next-generation atmospheric water technologies.
• The developed system effectively addresses global water challenges through sustainable water harvesting.