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Microemulsion Synthesize of Fe3O4/TiO2 Core-Shell Nanoparticles

Sonbolestan, Hosein | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42511 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Madaah Hoseini, Hamid Reza
  7. Abstract:
  8. In this study magnetite nanoparticles were synthesized by microemulsion and were coated with TiO2 by a precipitation technique. The synthesize process were done under fixed molar ratio of various constituents of microemulsion and molar ratio of water to oil. Results of X-ray diffraction spectroscopy (XRD) showed that the uncoated nanoparticles were consisted of magnetite as the major phase and no other detectable phases such as pure iron or hematite were found. Field emission scanning electron microscopy (FE-SEM) results showed that the synthesized nanoparticles small size and narrow particle size distribution. For TiO2 coating process the effect of TBOT concentration, water concentration, calcination temperature and different method of adding TBOT solution were investigated. XRD Phase analysis determined that the coating had an amorphous structure which changed to Anatase phase due to calcination between 400oC to 550oC. FE-SEM results showed uniform and controllable coating of TiO2 and acceptable particle size distribution after coating. Increasing TBOT concentration and water concentration resulted in thickening of TiO2 shell. Adding TBOT solution instantly resulted in better size distribution than adding by dropping funnel. Higher calcination temperature up to 550oC resulted in higher crystalline structure and Anatase was the only phase detected. Evaluation of photocatalytic properties of calcinated particles illustrated higher dye decomposition as the shell thickness increases
  9. Keywords:
  10. Magnetite ; Titanium Oxide ; Microemulsion ; Photocatalyst ; Magnetite Nanoparticle

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