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Bagheri Mehrabadi, Niloofar | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51813 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Simchi, Abdol Reza; Madaah Hosseini, Hamid Reza
  7. Abstract:
  8. The use of magnetic compounds for drug delivery and magnetic imaging has been studied in many studies. The easy use of magnetic particles makes them widespread. By applying a magnetic field, the particles reach the desired position and return to the original state by cutting off the field. The use of these magnetic materials in the nanoscale also adds other benefits, including: convenient and rapid transfer of nanoparticles, rapid repulsion of the kidneys, reducing the risk of overdose, etc. In recent years, the use of quantum dots for the diagnosis and treatment of tumors has attracted much attention. The use of hybrid quantum dots and magnetic nanoparticles can incorporate the desired properties of both. In this study, magnetic nanohybrid of grapheme quantum dots -iron oxide were produced during two stages: synthesis of iron oxide nanoparticles and then synthesis of grapheme quantum dots on iron oxide nuclei. The synthesis of iron oxide nanoparticles and graphene quantum dots have been done by solvothermal and reflux, respectively. The phase structure of nanoparticles of synthesized materials was determined by X-ray diffraction analysis. Iron oxide was identified in all the synthesized materials by this analysis. The study of the size and morphology of synthesized materials was performed using FESEM images. Saturated magnetization of synthesized nanohybrid was obtained 44.23 emu/g by using a vibrating-sample magnetometer. The Coercivity was also determined 7 Oe, which indicates the formation of iron oxide superparamagnetics. A Characterization of the nanoscale materials synthesized by TEM photographs was also carried out. Photoluminescence tests were performed on synthesized nanohybrid and its emmision peaks were in the wavelength range of red. According to the results, the synthesized nanohybrid has suitable magnetic and optical properties for multifunctional medical applications, such as MRI contrast enhancement and biological imaging
  9. Keywords:
  10. Graphene Quantum Dots (GQDs) ; Iron Oxide Nanoparticles ; Solvothermal Method ; Distillation ; Superparamagnetic Nanoparticles

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