褐藻糖胶
材料科学
聚二甲基硅氧烷
聚电解质
壳聚糖
化学工程
图层(电子)
润滑
涂层
摩擦学
水溶液
逐层
双层
多糖
水泡藻
纳米技术
复合材料
聚合物
化学
膜
有机化学
工程类
藻类
生物
生物化学
生态学
作者
Tracey T. M. Ho,Nichola Selway,Marta Krasowska,Gleb E. Yakubov,Jason R. Stokes,David A. Beattie
出处
期刊:Biotribology
[Elsevier]
日期:2017-12-01
卷期号:12: 15-23
被引量:6
标识
DOI:10.1016/j.biotri.2017.04.002
摘要
Polysaccharide polyelectrolyte multilayers (PEMs) based on fucoidan and chitosan were formed by Layer-by-Layer (LbL) assembly on polydimethylsiloxane (PDMS) substrates. The surface and aqueous lubrication properties of the PEM films are evaluated for two types of fucoidan extracted from separate seaweed species (Fucus vesiculosus – FV and Undaria pinnatifida – UP). Zeta potential and atomic force microscopy (AFM) imaging reveal that the PEM layers are formed with consistent charge reversal as each polysaccharide layer is adsorbed to the PDMS substrate, and that there is an associated increase in thickness of the multilayer. The multilayers containing FV fucoidan are found to be thicker than those containing UP fucoidan. Soft tribology measurements using matching PDMS tribo-pairs are used to show that the films are robust under rolling/sliding contacts and effective under aqueous lubricating conditions. The friction in the boundary lubrication regime is substantially decreased (relative to native hydrophobic PDMS) by the presence of the multilayers, with some dependence on whether fucoidan or chitosan is in the outer layer (5 or 5.5 bilayers) for FV fucoidan. The lowest friction coefficient is obtained for the multilayer with the thickest (and likely most hydrated) coating – the (FV/chitosan) 5.5 bilayer system. The results suggest that PEMs involving naturally derived polysaccharides such as fucoidan, which has notable antimicrobial properties and is resistant to enzymatic degradation, may provide opportunities in surface coating design in biomaterials applications for friction reduction.
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