| Liquid Flame Spray Made Titania and Titania-Silver Nanoparticle Deposits Functionality as Photocatalyst for Organic- and Biofilm Removal | ||
| H. Keskinen1, Jyrki M. Mäkelä2, Mikko Aromaa2, Sami Areva3, Cilâine Teixeira3, Jarl B. Rosenholm3, Viljami Pore4, Mikko Ritala4, Markku Leskelä4, Mari Raulio5, Mirja Salkinoja-Salonen5, Erkki Levänen6, Tapio Mäntylä6 and Jorma Keskinen2, (1)Institute of Physics, Tampere University of Technology, PO Box 692, FIN-33101, Tampere, Finland, (2)Aerosol Physics Laboratory, Tampere University of Technology, PO Box 692, FIN-33101, Tampere, Finland, (3)Department of Physical Chemistry, Åbo Akademi University, Porthansgatan 3-5, FIN-20500, Turku, Finland, (4)Laboratory of Inorganic Chemistry, University of Helsinki, PO Box 55, Helsinki, Finland, (5)Department of Applied Chemistry and Microbiology, University of Helsinki, PO Box 56, Helsinki, Finland, (6)Institute of Material Sciences, Tampere University of Technology, PO Box 589, Tampere, Finland Titania and titania-silver nanoparticle deposits were made by Liquid Flame Spray technique (LFS). In LFS the liquid precursor is injected into a high temperature flame, where it will evaporate and nucleate to nanosize particles. The precursors were titanium(IV)ethoxide (TEOT) and silver nitrate (AgNO3) in ethanol solution. One-step and two-step methods were used for preparation of titania-silver deposits. The silver amount was 1 wt%. The deposits were collected in the flame zone on steel and glass surfaces and were analyzed by TEM, EDS, XPS and SAXS. The titania deposits consisted of porous nanosized titania agglomerates of primary particles (~10 nm). With silver addition, small spherical silver metal particles (~ 2 nm) were detected on the agglomerates. An increase in the photocatalytic activity was verified by stearic acid decomposition and biofilm removal using Deinococcus geothermalis as the model organism. The titania-silver deposit produced by one-step method has the highest potential as photocatalyst. References Keskinen, H., J.M. Mäkelä, M. Aromaa, J. Ristimäki, T. Kanerva, E. Levänen, T. Mäntylä and J. Keskinen, 2006, Effect of silver addition on the formation and deposition of titania nanoparticles produced by Liquid Flame Spray. In press, accepted for publication in Journal of Nanoparticle Research 12/2005.
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