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Antireflective and Superhydrophobic Coating for Boosting Cyanobacterial Photobioreactor Performance
Mei Duan1, Xianglong Pang1, Fei Hao2,3
1School of Physical Science and Technology, Shaanxi Basic Discipline (Liquid Physics) Research Center, Northwestern Polytechnical University, Xi'an 710100, P. R. China.
ACS Applied Materials & Interfaces
|June 2, 2025
Summary
A new superhydrophobic silicon dioxide coating prevents biofouling and enhances light transmission in photobioreactors (PBRs). This cost-effective, fluorine-free coating boosts photosynthetic microorganism growth and bioproductivity.
Area of Science:
- Materials Science
- Biotechnology
- Chemical Engineering
Background:
- Biofouling in photobioreactors (PBRs) impedes light penetration, degrades the cultivation environment, and reduces bioproductivity.
- Developing effective antifouling strategies is crucial for optimizing photosynthetic microorganism cultivation.
Purpose of the Study:
- To develop a superhydrophobic silicon dioxide (SiO2) coating with antireflective properties to mitigate biofouling in PBRs.
- To evaluate the coating's efficacy in preventing cyanobacterial adhesion and enhancing light transmission.
- To assess the impact of the coating on cyanobacterial proliferation and chlorophyll-a content.
Main Methods:
- Utilized sol-gel technology for fabricating a fluorine-free, heat-free superhydrophobic SiO2 coating.
- Quantified light transmittance enhancement across various substrate materials (glass, polystyrene, PVC, polycarbonate).
- Applied the coating to glass tube PBRs and compared cyanobacterial growth and chlorophyll-a content against uncoated controls and PBRs with rough superhydrophobic coatings.
Main Results:
- The developed SiO2 coating exhibited excellent antifouling properties and enhanced light transmission by 5.8–7.0% compared to uncoated substrates.
- Application to glass tube PBRs significantly promoted cyanobacterial proliferation and chlorophyll-a content.
- The coating's transparency was maintained, unlike rough superhydrophobic coatings that compromised light penetration.
Conclusions:
- The superhydrophobic SiO2 coating effectively addresses biofouling challenges in PBRs by combining antifouling and antireflective properties.
- The cost-effective and scalable fabrication process makes it suitable for industrial applications.
- This technology holds significant potential for enhancing the cultivation of photosynthetic microorganisms in the cyanobacterial industry and other bioculture domains.
