Comparison of the Fouling Release Properties of Hydrophobic Fluorinated and Hydrophilic PEGylated Block Copolymer Surfaces: Attachment Strength of the Diatom Navicula and the Green Alga Ulva

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• 作者：Sitaraman Krishnan ; Nick Wang ; Christopher K. Ober ; John A. Finlay ; Maureen E. Callow ; James A. Callow ; Alexander Hexemer ; Karen E. Sohn ; Edward J. Kramer ; and Daniel A. Fischer
• 刊名：Biomacromolecules
• 出版年：2006
• 出版时间：May 2006
• 年：2006
• 卷：7
• 期：5
• 页码：1449 - 1462
• 全文大小：420K
• 年卷期：v.7,no.5(May 2006)
• ISSN：1526-4602

文摘

To understand the role of surface wettability in adhesion of cells, the attachment of two different marine algaewas studied on hydrophobic and hydrophilic polymer surfaces. Adhesion of cells of the diatom Navicula andsporelings (young plants) of the green macroalga Ulva to an underwater surface is mainly by interactions betweenthe surface and the adhesive exopolymers, which the cells secrete upon settlement and during subsequentcolonization and growth. Two types of block copolymers, one with poly(ethylene glycol) side-chains and theother with liquid crystalline, fluorinated side-chains, were used to prepare the hydrophilic and hydrophobic surfaces,respectively. The formation of a liquid crystalline smectic phase in the latter inhibited molecular reorganizationat the surface, which is generally an issue when a highly hydrophobic surface is in contact with water. Theadhesion strength was assessed by the fraction of settled cells (Navicula) or biomass (Ulva) that detached fromthe surface in a water flow channel with a wall shear stress of 53 Pa. The two species exhibited opposite adhesionbehavior on the same sets of surfaces. While Navicula cells released more easily from hydrophilic surfaces, Ulvasporelings showed higher removal from hydrophobic surfaces. This highlights the importance of differences incell-surface interactions in determining the strength of adhesion of cells to substrates.