Sunkara B K, Misra R D K
Center for Structural and Functional Materials and Chemical Engineering Department, University of Louisiana at Lafayette, P.O. Box 44130, Lafayette, LA 70504-4130, USA.
Acta Biomater. 2008 Mar;4(2):273-83. doi: 10.1016/j.actbio.2007.07.002. Epub 2007 Jul 21.
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.
该研究表明，与未掺杂的二氧化钛相比，包覆在镍铁氧体纳米颗粒上的W4+掺杂二氧化钛的抗菌活性有显著增强。复合纳米颗粒是通过将反胶束和化学水解合成方法独特地结合起来合成的[Rana S, Rawat J, Misra RDK, Acta Biomater 2005;1:691]。W4+掺杂二氧化钛的卓越抗菌活性与抑制电子-空穴复合以及二氧化钛带隙能量的降低有关。铁氧体的作用是利用小磁场促进纳米颗粒从喷涂表面去除。用二氧化钛包覆铁氧体纳米颗粒可保持复合纳米颗粒的超顺磁性特征和磁强度，这表明磁性能未恶化，并促进了它们作为可去除抗菌光催化剂纳米颗粒的应用。
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