title: Enhanced antibactericidal function of W4+-doped titania-coated nickel ferrite composite nanoparticles: a biomaterial system.
abstract: The study demonstrates a distinct enhancement of antimicrobial activity of W4+-doped titania that is coated on nickel ferrite nanoparticles in comparison to undoped titania. The composite nanoparticles were synthesized by uniquely combining reverse micelle and chemical hydrolysis synthesis methods [Rana S, Rawat J, Misra RDK, Acta Biomater 2005;1:691]. The superior antimicrobial activity of W4+-doped titania is related to the inhibition of electron-hole recombination and decrease in the band gap energy of titania. The function of the ferrite is to facilitate the removal of nanoparticles from the sprayed surface using a small magnetic field. The coating of ferrite nanoparticles with titania retains superparamagnetic character and magnetic strength of composite nanoparticles signifying non-deterioration of magnetic properties and promoting their use as removable antimicrobial photocatalyst nanoparticles.
authors.affiliation: Center for Structural and Functional Materials and Chemical Engineering Department, University of Louisiana at Lafayette, P.O. Box 44130, Lafayette, LA 70504-4130, USA.
authors.forename: B K
authors.initials: BK
authors.lastname: Sunkara
authors.forename: R D K
authors.initials: RD
authors.lastname: Misra
mesh_terms: D000900:Anti-Bacterial Agents; D001391:Azo Compounds; D001672:Biocompatible Materials; D048168:Escherichia coli K12 / Q000187:drug effects; D005290:Ferric Compounds; D008280:Magnetics; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D046529:Microscopy, Electron, Transmission; D036103:Nanotechnology; D009532:Nickel; D010777:Photochemistry; D014025:Titanium; D014414:Tungsten
chemical_list: D000900:Anti-Bacterial Agents; D001391:Azo Compounds; D001672:Biocompatible Materials; D005290:Ferric Compounds; C009495:titanium dioxide; C100258:methyl orange; D009532:Nickel; D014025:Titanium; D014414:Tungsten