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In this study, it was aimed to fabricate a super hydrophobic layer as an air-retaining surface on a commercial wet suit to reduce the drag force. Silica nanoparticles (SiNPs) were synthesized in situ on the outer surface of a wet suit through sol-gel method and then they were treated with hydrolyzed n-octyltriethoxysilane (OTES). Scanning electron microscopy (SEM) and atomic-force microscopy (AFM) images showed a uniform formed coating of SiNPs on the surface of wet suit. The values of Static water-contact angle (SWC) and water-shedding angle (WSA) for hydrolyzed samples were 153° (for a 10 μL water droplet) and 34° (for a 15 μL water droplet) respectively. Attributed to the desired formed air film, the wind tunnel test results showed drag reduction for coated wet suit. The introduced product showed high potent for long distance swimming and triathlon.

Fabricating an Air-Retaining Surface on Outer Surface of Wetsuit by In-Situ Synthesis of Silica Nanoparticles