Bioinspired Zwitterionic Nanowires with Simultaneous Biofouling Reduction and Release.

Area of Science:

• Materials Science
• Surface Chemistry
• Marine Biology

Background:

• Marine biofouling significantly increases maritime industry carbon emissions due to drag.
• Existing non-toxic marine paints lack effective fouling reduction and release capabilities.
• Nature-inspired antifouling strategies are crucial for sustainable maritime solutions.

Purpose of the Study:

• To introduce a novel superoleophobic zwitterionic nanowire coating for simultaneous marine fouling reduction and release.
• To investigate the mechanism behind the coating's antifouling performance.
• To provide a new synthesis pathway for advanced antifouling coatings.

Main Methods:

• Fabrication of a superoleophobic zwitterionic nanowire coating with a nanostructured hydration layer.
• Evaluation of fouling reduction and release performance under low shear force.
• Analysis of the mechanical biocidal effect and interfacial adhesion mechanisms.

Main Results:

• The zwitterionic nanowires achieved >25% improved fouling reduction compared to state-of-the-art antifouling nanostructures.
• Fouling release was four times higher than conventional zwitterionic coatings, achieved at significantly lower shear forces.
• Simultaneous fouling reduction and release were attributed to the nanowire geometry's mechanical biocidal effect and the hydration layer's low interfacial adhesion.

Conclusions:

• The developed coating demonstrates a novel approach to simultaneous fouling reduction and release, inspired by natural antifouling strategies.
• The findings offer insights into designing nanostructured coatings for effective antifouling in maritime and biomedical applications.
• The new synthesis procedure facilitates the practical implementation of these advanced antifouling coatings.