Magnetic nano composites on the basis of TiO2 Fe3O4
| 18.08.2018, 08:09 | |
Results confirm high efficiency and convenience of skilled application of core-shell type microsphere Fe3O4: TiO2 to capture phosphopeptides and MS MALDI-TOF analysis. Magnetic nanoparticles Fe3O4: TiO2 not only possess the ability to capture some pathogenic bacteria but also effectively suppress bacteria cells growth appearing during a short time under the influence of ultra-violet lamp of low power. To cover magnetite with titanium dioxide is rather difficult, low TiO2 crystallinity being the reason of its low photo activity. High-heat treatment was used to avoid this difficulty. Though it should be noted that super paramagnet can turn into y-Fe3O4 ferromagnet or a- Fe3O4 paramagnet during high-heat treatment of magnetic cores Fe3O4. Magnetic nanocomposite core-shell type Fe3O4: TiO2 was prepared by a new non-thermal method of magnetite nanoparticles encapsulation in anatase titanium dioxide. A pure anatase and nanoparticles magnetite phase was independently prepared with the help of sol-gel methods. VSM, XRD, SEM and EDX TEM analyses confirmed that the magnetic phase was formed on the magnetite and TiO2 shell regularly covers Fe3O4 with a thin layer though only due to the forces of adhesion. Besides, no chemical reaction between TiO2 and Fe3O4 proceeds that was confirmed by X-ray diffraction method. TEM and SAM images showed that core had the shape of ellipsoids with an average size 10nm and 5nm-thick shell. Magnetic measurements showed decrease in magnetisation of saturation after TiO2 drawing. Afanasev D. A. | |
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