Rana S, Rawat J, Sorensson M M, Misra R D K
Center for Structural and Functional Materials, University of Louisiana at Lafayette, P.O. Box 44130, Lafayette, LA 70504-4130, USA.
Acta Biomater. 2006 Jul;2(4):421-32. doi: 10.1016/j.actbio.2006.03.005. Epub 2006 May 12.
The present study describes and makes a relative comparison of the antimicrobial function of undoped and neodymium-doped titania coated-nickel ferrite composite nanoparticles processed by uniquely combining the reverse micelle and chemical hydrolysis approaches. This methodology facilitates the formation of undoped and doped photocatalytic titania shells and a magnetic ferrite core. The ferrite core is needed to help in the removal of particles from the sprayed surface using a small magnetic field. Doping of the titania shell with neodymium significantly enhances the photocatalytic and anti-microbial function of the core-shell composite nanoparticles without influencing the magnetic characteristics of the nickel ferrite core. The increased performance is believed to be related to the inhibition of electron-hole recombination and a decrease in the band gap energy of titania. The retention of magnetic strength ensures controlled movement of the composite nanoparticles by the magnetic field, facilitating their application as removable anti-microbial photocatalyst nanoparticles. The consistent behavior of the composite nanoparticles points to the viability of the synthesis process adopted.
本研究描述并对通过独特结合反相微乳液法和化学水解法制备的未掺杂和钕掺杂二氧化钛包覆镍铁氧体复合纳米粒子的抗菌功能进行了相对比较。这种方法有助于形成未掺杂和掺杂的光催化二氧化钛壳层以及磁性铁氧体核。需要铁氧体核来利用小磁场帮助从喷涂表面去除颗粒。用钕掺杂二氧化钛壳层可显著增强核壳复合纳米粒子的光催化和抗菌功能，而不影响镍铁氧体核的磁性特征。性能的提高被认为与抑制电子 - 空穴复合以及二氧化钛带隙能量的降低有关。磁性强度的保持确保了复合纳米粒子在磁场作用下的可控移动，便于它们作为可移除的抗菌光催化剂纳米粒子应用。复合纳米粒子的一致行为表明所采用的合成过程是可行的。
