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Friday, 20 September 2019
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Raw materials & technologies, Technologies, Functional coatings

CFD model predicts frictional resistance of antifouling coatings

Thursday, 14 August 2014

Copolymers SBS-DFHMA and mesoporous silica SBA-15 were synthesised and mixed to prepare hybrid antifouling coatings by a spin-coater.

Fouling can cause great damage on ship hulls

Source: Eric Gevaert -  Fotolia.com

Fouling can cause great damage on ship hulls

Source: Eric Gevaert -  Fotolia.com

By measuring the surface water contact angle and the attachment of Pseudomonas fluorescens, Chlorella and Diatoms, antifouling properties of the coatings were evaluated.

Coatings surface formed micro-nano structure

The results showed that the surface of hybrid coatings, the water contact angle arrived at 120°, were more hydrophobic than the SBS-DFHMA coatings. In terms of resistance of adhesion, low surface energy coatings of SBS-DFHMA could effectively weaken the adhesion behaviour of Pseudomonas fluorescens and Diatoms, but the role to Chlorella was not obvious. When 0.01g/ml SBA-15 were added, the adhesion of three marine microorganisms all had a very significant decrease to the hybrid coatings. This indicated that the fluorinated low surface energy antifouling coatings had limitation on resisting Chlorella attaching, and the addition of SBA-15 not only enhanced the ability of resistance to adhesion but also widened the applicability to more fouling and narrowed its limitations. This surprising effect was due to the micro-nano convex structure of the coatings' surface caused by hybrid.

The study is published in: Journal of Colloid and Interface Science, Early View.

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