Improved Water Collection from Short-Term Fog on a Patterned Surface with Interconnected Microchannels

Area of Science:

• Materials Science
• Environmental Engineering
• Water Resource Management

Background:

• Fog harvesting is a sustainable method for freshwater collection, crucial for combating water scarcity.
• Existing research on water collection from short-term fog events is limited, despite fog's prevalence in arid regions.
• Traditional fog-harvesting surfaces face challenges with efficiency and startup time.

Purpose of the Study:

• To develop and evaluate a patterned surface for enhanced water collection from short-term fog.
• To investigate the impact of surface microchannels on droplet convergence and collection efficiency.
• To provide a practical solution for improving fog-harvesting technology in arid and semiarid environments.

Main Methods:

• Fabrication of a patterned surface featuring hydrophilic microchannels on a superhydrophobic substrate.
• Utilized laser ablation and chemical vapor deposition for controllable surface preparation.
• Quantified water collection rates and startup times under simulated and outdoor mild fog conditions.

Main Results:

• The optimized patterned surface achieved a water collection rate of 67.31 g m⁻² h⁻¹, exceeding the pristine surface by over 130%.
• The interconnected microchannels significantly reduced the startup time for droplet formation and collection.
• Demonstrated potential for short-term fog harvesting through outdoor environmental testing.

Conclusions:

• The rationally designed patterned surface effectively enhances water collection from short-term fog.
• This technology presents a viable approach to address practical challenges in fog-harvesting systems.
• The study contributes a meaningful advancement towards sustainable freshwater generation.