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Fouling-Release Properties Of Dendritic Polyglycerols Against Marine Diatoms.

Robin Wanka, J. Finlay, Kim A. Nolte, J. Koc, Victoria Jakobi, C. Anderson, A. Clare, H. Gardner, Kelli Z Hunsucker, G. Swain, A. Rosenhahn
Published 2018 · Materials Science, Medicine

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Dendritic polyglycerols (PGs) were grafted onto surfaces using a ring-opening polymerization reaction, and the fouling-release properties against marine organisms were determined. The coatings were characterized by spectroscopic ellipsometry, contact angle goniometry, ATR-FTIR, and stability tests in different aqueous media. A high resistance toward the attachment of different proteins was found. The PG coatings with three different thicknesses were tested in a laboratory assay against the diatom Navicula incerta and in a field assay using a rotating disk. Under static conditions, the PG coatings did not inhibit the initial attachment of diatoms, but up to 94% of attached diatoms could be removed from the coatings after exposure to a shear stress of 19 Pa. Fouling release was found to be enhanced if the coatings were sufficiently thick. The excellent fouling-release properties were supported in dynamic field-immersion experiments in which the samples were continually exposed to a shear stress of 0.18 Pa.
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