Stretch-Induced Integrative Bioinspired Spider Silk Fiber for Enhancement of Fog Collection

Area of Science:

• Materials Science
• Biomimetics
• Fluid Dynamics

Background:

• Bioinspired spider silk fibers (BSSFs) show promise for fog capture but suffer from slow droplet transport, limiting efficiency.
• The Sarracenia trichome's structure facilitates rapid water transfer, offering a potential solution to BSSFs' limitations.

Purpose of the Study:

• To design and fabricate a novel bioinspired fiber with hydrophilic microchannels (HMSSF) that accelerates droplet transportation for enhanced fog collection.
• To combine the fog capturing ability of spider silk with the rapid water transfer of Sarracenia trichomes.

Main Methods:

• Fabrication of HMSSF using surface wrinkling of soft elastomers via a simple stretching method.
• Introduction of hydrophilic microchannels along the fiber length through controlled stretching.

Main Results:

• Successfully created HMSSFs with numerous, easily introduced microchannels.
• HMSSFs demonstrated both efficient fog capture and fixed-point convergence, alongside rapid water transfer capabilities.
• Achieved a 466.7% increase in fog collection rate compared to conventional BSSFs.

Conclusions:

• The developed HMSSF effectively addresses the slow droplet transport issue in BSSFs.
• This novel material design significantly enhances fog collection efficiency, offering a 466.7% improvement.
• The study provides a promising new direction for developing advanced fog harvesting materials and improving collection rates.