A Highly Transparent and Durable Superhydrophobic Coating for Long-Term Underwater Optical Applications

Area of Science:

• Materials Science
• Surface Chemistry
• Optical Engineering

Background:

• Optical monitoring sensors face signal attenuation in harsh aquatic environments due to fouling.
• Existing superhydrophobic coatings struggle to balance underwater durability with optical transparency.

Purpose of the Study:

• To develop a highly transparent and durable superhydrophobic coating for underwater optical monitoring sensors.
• To address the challenge of signal attenuation caused by pollutant accumulation.

Main Methods:

• Fabrication of an epoxy resin/perfluorooctyltriethoxysilane-candle soot (oxidized) (EP/F-CS(O)) coating.
• Thermally depositing candle soot and annealing to remove carbon black.
• Characterization of superhydrophobicity, transparency, and stability.

Main Results:

• The EP/F-CS(O) coating exhibited superhydrophobicity (CA=160.1°, SA=0.67°) and high transparency (89.41%).
• The coating demonstrated exceptional durability in harsh water environments for 30 days.
• Application to underwater optical sensors reduced signal attenuation by 98.2% over 30 days.

Conclusions:

• The EP/F-CS(O) coating effectively mitigates pollutant accumulation and signal attenuation in underwater optical sensors.
• This superhydrophobic coating significantly improves monitoring accuracy and extends sensor service life.
• The coating shows great potential for real-world applications in underwater optical monitoring.