Osirys - Newsletter - February 2015

netcomposites

Osirys - Newsletter - February 2015

Photocatalytic CoatingsPhotocatalytic coatings to improve indoor air quality.Indoor air pollutants impact humanhealth, comfort and efficiency. The maincontributing sources of VOC are motorvehicle exhaust, household products,paints, solvents and volatile additives inadhesives used in furniture, carpets andother floor covers.One technology to remove VOC is the useof heterogeneous photocatalytic oxidation(PCO). Operating at room temperature,PCO can degrade a broad range ofcontaminants without significant energyinput. Inactivation of microorganisms isthe most important mechanism to avoidmicrobial growth on surfaces, which isnormally connected to biofilm developmentin nature as well as on technical orconstruction materials. Thus, anti-microbialstrategies mean to inactivate bacteria, fungiand algae cells to prevent contaminationwhich may influence the optical as well asfunctional properties and can be, in seriouscases, the origin of illnesses.The available commercial products toremove VOCs are mainly for outdoorapplications and most require UV lightirradiation to be effective. One of the maininnovations of the OSIRYS project will bethe development of a photocatalytic systemable to be active under visible light.Coatings for indoor applications are typicallyapplied onto base materials like paper,textiles, wood or metal. The biocompositesdeveloped in the OSIRYS project will have apolymeric surface which is in general morehydrophobic than typical indoor surfaces.VOCs in rooms, and biofilms on indoorfaçades,impact human health and comfort.The biocomposites developed will befurnished with a multifunctional coatingTest setup to evaluate inactivation of microorganismswhich decomposes the VOC and preventsthe formation of biofilm. These functionswill be achieved by preparing formulationswith photocatalytic active additives. Theformulations prepared by the projectpartner SICC will be applied to the selectedmaterials and characterised with regard totheir activity to decompose selected VOCsand to inactivate relevant microorganisms.To evaluate the activity of the differentcommercial and new synthesizedmaterials, the first objective for projectpartner Fraunhofer IGB was to build upand establish suitable methods for paintsas well as powder materials. One taskwas to develop suitable test-setups toanalyse VOC degradation capacity of photocatalytically active surfaces and powders.A further task was to develop a methodto evaluate the antimicrobial properties ofphoto-catalytically active surfaces. The testsetups have given information about thedegradation activity corresponding to theoxidation activity for titanium oxide basedmaterials under relevant environmentalconditions in a reproducible way. It alsoallows the comparison of different materialsin a relatively short time.12 OSIRYS Project

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