Formation and tribology of fucoidan/chitosan polyelectrolyte multilayers on PDMS substrates
| Autor: | Marta Krasowska, Gleb E. Yakubov, Nichola Selway, Tracey T. M. Ho, Jason R. Stokes, David A. Beattie |
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| Přispěvatelé: | Ho, Tracey TM, Selway, Nichola, Krasowska, Marta, Yakubov, Gleb E, Stokes, Jason R, Beattie, David A |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
macromolecular substances 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Biomaterials Chitosan chemistry.chemical_compound fucoidan Coating PDMS Zeta potential Composite material lubrication polyelectrolyte multilayer Polydimethylsiloxane Fucoidan Bilayer technology industry and agriculture 021001 nanoscience & nanotechnology Polyelectrolyte 0104 chemical sciences Surfaces Coatings and Films Surface coating chemistry engineering chitosan 0210 nano-technology |
| Zdroj: | Biotribology. 12:15-23 |
| ISSN: | 2352-5738 |
| DOI: | 10.1016/j.biotri.2017.04.002 |
| Popis: | 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. Refereed/Peer-reviewed |
| Databáze: | OpenAIRE |
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