| AVS 66th International Symposium & Exhibition | |
| Biomaterial Interfaces Division | Wednesday Sessions |
| Session BI+AS-WeM |
| Session: | Microbes and Fouling at Surfaces |
| Presenter: | Robin Wanka, Ruhr-University Bochum, Germany |
| Authors: | R. Wanka, Ruhr-University Bochum, Germany N. Aldred, Newcastle University, UK J.A. Finlay, Newcastle University, UK K.A. Nolte, Ruhr-University Bochum, Germany J. Koc, Ruhr-University Bochum, Germany H. Gardner, Florida Institute of Technology K.Z. Hunsucker, Florida Institute of Technology G.E. Swain, Florida Institute of Technology C. Anderson, Newcastle University, UK A.S. Clare, Newcastle University, UK A. Rosenhahn, Ruhr-University Bochum, Germany |
| Correspondent: | Click to Email |
Polyethylene glycol (PEG) containing coatings show outstanding antifouling properties, which is commonly assigned to their hydrophilicity and their highly hydrated nature. A structurally related but hyperbranched version are polyglycerols (PGs) that increase the spatial density of non-fouling polymer units and decrease the defect density in coatings.1,2 So far they were successfully applied in biomedicine against attachment by pathogenic bacteria. Using a surface initiated ring opening polymerization reaction3, we grafted dendritic PGs on surfaces. The resulting samples were characterized by spectroscopic ellipsometry, contact angle goniometry, ATR-FTIR, and by degradation experiments. The prepared surfaces show excellent protein-resistance. The fouling release properties were tested in a standardized lab assay with diatoms (Navicula incerta) and in a dynamic field assay[4] at the FIT test site in Florida. The initial attachment of diatoms under static conditions was similar on the PGs as compared to a hydrophobic control. However, PGs show outstanding fouling release properties. Up to 94% of attached diatoms could be removed from the coatings after the exposure to a shear stress of 19 Pa. These results were confirmed in the field assays.5 The range of testes species was also extended to macro-fouling organisms such as zoospores of green algae (Ulva linza) and barnacle larvae (Balanus amphitrite).
(1) Wyszogrodzka, M.; Haag, R. Synthesis and characterization of glycerol dendrons, self-assembled monolayers on gold: A detailed study of their protein resistance. Biomacromolecules 2009, 10, 1043–1054.
(2) Siegers, C.; Biesalski, M.; Haag, R. Self-assembled monolayers of dendritic polyglycerol derivatives on gold that resist the adsorption of proteins. Chemistry 2004, 10, 2831–2838.
(3) Weber, T.; Gies, Y.; Terfort, A. Bacteria-Repulsive Polyglycerol Surfaces by Grafting Polymerization onto Aminopropylated Surfaces. Langmuir 2012, 28, 15916–15921.
(4) Nolte, K. A.; Koc, J.; Barros, J. M.; Hunsucker, K.; Schultz, M. P.; Swain, G. E.; Rosenhahn, A. Dynamic field testing of coating chemistry candidates by a rotating disk system. Biofouling 2018, 49, 1–12.
(5) Wanka, R.; Finlay, J. A.; Nolte, K. A.; Koc, J.; Jakobi, V.; Anderson, C.; Clare, A. S.; Gardner, H.; Hunsucker, K.; Swain, G. W. et al. Fouling-Release Properties of Dendritic Polyglycerols against Marine Diatoms. ACS applied materials & interfaces 2018, DOI: 10.1021/acsami.8b 12017 .