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    Hydrophobic coating of surfaces by plasma polymerization in an RF plasma reactor with an outer planar electrode: synthesis, characterization and biocompatibility
    (IOP PUBLISHING LTD, 2017) Karaman, Mustafa; Gursoy, Mehmet; Aykul, Fatmanur; Tosun, Zahide; Kars, M. Demirel; Yildiz, H. Bekir
    This paper presents the plasma polymerization of poly(hexafluorobutyl acrylate) (PHFBA) thin films on different substrates in an RF plasma reactor with an outer planar electrode. This reactor configuration allows. large area uniformity and fast processing times. Deposition rates of up to 60 nm min(-1) were observed. The influence. of plasma power and substrate temperature on the. deposition rate, structure and wettability of the as-deposited films was. investigated. It was observed that better hydrophobicity was obtained at high plasma power and in low temperature conditions. PHFBA thin films deposited on electrospun poly(acrylonitrile) fiber mats under such conditions resulted in superhydrophobic surfaces with. contact angle values greater than 150 degrees. In. vitro cell studies using human epithelial cells demonstrated the non-toxic nature of the. plasma-polymerized PHFBA films.
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    Template assisted synthesis of photocatalytic titanium dioxide nanotubes by hot filament chemical vapor deposition method
    (ELSEVIER SCIENCE BV, 2013) Karaman, Mustafa; Sariipek, Fatma; Koysuren, Ozcan; Yildiz, H. Bekir
    Titanium dioxide thin films were deposited conformally over electrospun polymethyl methacrylate (PMMA) fibers by hot filament chemical vapor deposition method. Deposition rates were observed to be very high to allow for rapid coatings. Thermal annealing of as deposited materials leads the clean decomposition of the polymeric inner layer and formation of randomly distributed anatase TiO2 nanotubes. Nanotubular TiO2 structure was clearly identified by SEM and that structure is ideal for good photocatalytic activity because of its high surface area per unit volume ratio. FTIR and XPS results show the formation of stoichiometric TiO2, and the crystalline form of the final nanotubes was found to be anatase (1 0 1) after XRD analysis. High photocatalytic activity of TiO2 nanotubes under UV irradiation was observed with an apparent rate constant of 0.74 h(-1) for methyl orange decomposition. (C) 2013 Elsevier B.V. All rights reserved.