Copper Oxide Microtufts on Natural Fractals for Efficient Water Harvesting

Area of Science:

• Materials Science
• Surface Engineering
• Biomimetics

Background:

• Hierarchical surfaces are crucial for effective fog and moisture harvesting.
• Leaf skeletons offer a unique natural architecture for designing advanced surfaces.
• Developing efficient and sustainable water collection systems is a global priority.

Purpose of the Study:

• To create and evaluate a multiscale surface inspired by leaf skeletons for enhanced water droplet nucleation, growth, and directional transport.
• To investigate the fog harvesting capabilities of copper oxide microtufts fabricated on Ficus religiosa leaf skeletons.
• To assess the impact of surface wettability, microtuft structures, fractal patterns, and vein orientation on water collection efficiency.

Main Methods:

• Fabrication of copper oxide microtufts on Ficus religiosa leaf skeletons using electroplating and chemical oxidation.
• Characterization of surface wettability and fog harvesting performance.
• Investigation of the role of microtufts, fractal structures, and vein orientation in water droplet dynamics.
• Comparison of fabricated surfaces with planar control surfaces.

Main Results:

• The fabricated copper oxide microtuft surfaces exhibited high wettability and excellent fog harvesting ability.
• These surfaces remained efficient in fog harvesting despite developing hydrophobic characteristics over time due to airborne species adsorption.
• Copper oxide microtuft-coated leaf skeletons showed significantly higher fog harvesting efficiency compared to planar control surfaces, both uncoated and coated.
• Water collection rates varied slightly with vein orientation for superhydrophilic surfaces.

Conclusions:

• Hierarchical surfaces combining copper oxide microtufts and fractal structures on leaf skeletons provide an effective and sustainable method for water capture and transport.
• The biomimetic design significantly enhances fog harvesting efficiency, offering valuable insights for developing advanced fog collection systems.
• The study highlights the potential of utilizing natural structures like leaf skeletons for creating high-performance, eco-friendly water harvesting technologies.