Microbubble-Mediated Synthesis of Smart Spindle Microfibers for Fog Harvesting

Area of Science:

• Materials Science
• Environmental Science
• Chemical Engineering

Background:

• Fog is a vital, yet underutilized, freshwater resource.
• Traditional fog collectors face challenges in fabrication complexity and efficiency.
• Spindle-knotted microfibers show promise but are difficult to produce.

Purpose of the Study:

• To introduce a simple microfluidic method for fabricating smart spindle microfibers (SSMs).
• To enhance fog harvesting efficiency through optimized microfiber structures and surface properties.
• To develop adaptable materials for consistent water collection under varying environmental conditions.

Main Methods:

• Fabrication of SSMs using a microfluidic approach with microbubbles and peristaltic pump pulses.
• Utilizing thermo-responsive poly(N-isopropylacrylamide) (PNIPAm) for knot and joint formation.
• Characterizing the structural stability, surface hydrophilicity, and wettability of SSMs.

Main Results:

• Achieved a fog collection rate of 0.046 g min⁻¹, a 161% improvement over previous efficiencies.
• SSMs exhibited enhanced structural stability and hydrophilic rough surfaces, maximizing water droplet collection.
• Demonstrated tunable wettability of SSMs across temperature cycles, ensuring consistent performance.

Conclusions:

• The microfluidic method offers a scalable and efficient way to produce advanced fog-harvesting materials.
• SSMs provide a significant advancement in fog water collection technology.
• The developed materials offer practical solutions for large-scale water harvesting to combat freshwater scarcity.