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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Alakomi, Hanna-Leena
VTT Technical Research Centre of Finland
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2012Low-fouling membrane surfaces by using thin coating technologies
- 2006Control of biofilm growth through photodynamic treatments combined with chemical inhibitors: In vitro evaluation methods
- 2005The action of berry phenolics against human intestinal pathogens
- 2004Application of microplate scale fluorochrome staining assay for assessment of viability and stability of probiotic Bifidobacterium sp.
Places of action
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conferencepaper
Low-fouling membrane surfaces by using thin coating technologies
Abstract
Among others hydrophilicity and low surface roughness arethe key factors in the development of low-foulingsurfaces for thin-film-composite reverse osmosis (TFC RO)membranes. The main focus of the recent study was todevelop and evaluate different thin coating technologieswhich could have potentiality to introduce low-foulingperformance on commercial TFC RO membrane surface.Furthermore, it was aimed to improve the mechanical andchemical resistance of the TFC RO membrane surface. Theselected thin coating technologies, includinginorganic-organic sol-gel and inorganic ALD (atomic layerdeposition) thin films and also antibacterial polymerfilms, were studied. Typical sol-gel coating consisted oforganically modified siloxanes whereas aluminium oxide(Al2O3) thin film was applied by the ALD method. Inaddition, different active agents, such as zinc oxide(ZnO) and carbon nanotube (CNT), were used tofunctionalise the polyvinyl alcohol (PVA) thin coatings.Commercial DOW LE membrane was used as a substrate forthe coating applications. The coating thickness variedfrom 5 nm to 200 nm depending on the applied thin coatingmethod. The surface chemistry and structure of the coatedsurfaces were characterised by using ATR-FTIR, AFM andSEM-EDS. Based on the surface analysis all the appliedcoatings decreased the roughness of the membrane surface.Contact angle measurement was used to determine thehydrophilicity and hydrophobicity as well as to calculatethe surface energy of the coated surfaces. Some of theapplied coatings were clearly more hydrophilic comparedto the uncoated membrane surface. The bacteria attachmenttest with a flow was carried out to evaluate theanti-fouling performance of the surfaces. In theparticular method the coated samples were contacted withPseudomonas aeruginosa cells for 24 hours in modifiedstandard seawater (ASTM D1141-98 (2008)) in roomtemperature (130 rpm orbital shaker) and after 24 hbacterial exposure the number of adhered cells on thesurface was analysed. In general it was seen that lessbacteria was attached to hydrophilic surface, but on theother hand it was noticed that the low surface roughnessdecreased the bacteria attachment even the surface wasrelatively hydrophobic. Furthermore it is suggest thatsome of the functional chemical groups also decrease thebacteria attachment. The flux and salt rejection test wasperformed for the selected samples to evaluate themembrane's filtration performance. As expected all thetested coatings showed lower flux compared to unmodifiedTFC RO membrane.