Biomimetics for early stage biofouling prevention: templates from insect cuticles

Area of Science:

• Materials Science
• Biomimetics
• Surface Chemistry

Background:

• Biofouling poses significant challenges in marine environments, leading to increased operational costs and reduced efficiency.
• Developing effective antifouling strategies is crucial for marine applications, including shipping and infrastructure.
• Insect wings, such as those of cicadas and dragonflies, exhibit natural superhydrophobic and self-cleaning properties.

Purpose of the Study:

• To investigate the antifouling potential of biomimetic materials.
• To replicate the micro/nanostructure of cicada and dragonfly wings using epoxy resin.
• To evaluate the performance of these replicated surfaces against marine biofouling and adsorption of biomolecules.

Main Methods:

• Fabrication of superhydrophobic surfaces by replicating cicada and dragonfly wing structures using epoxy resin.
• Marine biofouling tests conducted for up to one week.
• Assays for protein, carbohydrate, and DNA adsorption.
• Comparison with a commercial antifouling paint and a smooth polymer control surface.

Main Results:

• The replicated surfaces exhibited superior antifouling properties compared to the smooth control surface.
• The biomimetic materials showed comparable efficiency to commercial antifouling paint in reducing DNA (10%), protein, and carbohydrate adsorption (15%).
• The most disordered surface, the dragonfly wing replicate, demonstrated the lowest adsorption values, potentially due to trapped air at the nanoscale roughness.

Conclusions:

• Biomimetic replication of insect wing surfaces offers a promising approach for developing effective antifouling materials.
• The nanostructure and trapped air on these surfaces contribute to reduced biofouling and biomolecular adsorption.
• Further research into surface disorder could optimize antifouling performance for marine applications.