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Synthesis of Fe3O4@ SiO2 Core-shell Magnetic Nanoparticles with Porous SiO2 Shell Extracted from Rice Husk Ash

Aharipour, Nazli | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55225 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Nemati, Ali
  7. Abstract:
  8. Magnetic nanoparticles, especially magnetic nanoparticles with silicate coatings, have attracted the attention of many researchers; Mainly because the silica shell can be functionalized with different molecules and functional groups and used in biological applications as targeted drug carriers. This study aimed to synthesize Fe3O4 core-shell nanoparticles with continuous and porous SiO2 shells on the surface of Fe3O4 particles. So that the coating is done evenly and with a strong connection. The procedure was as follows: core nanoparticle individual nanoparticles were made by the single-step method. To extract silica from rice husk, rice husk was subjected to heat treatment to obtain rice husk ash. Then, dissolved silica in the form of sodium silicate was extracted from rice husk ash and then silica precipitate was obtained by lowering the pH. The resulting gel was dried and finally, the resulting powder with a solution of iron chloride salts was used to synthesize core-shell particles. To prevent agglomeration and improve the coating of magnetic nanoparticles, the coating agent of the mint extract was used, and to achieve the porous coating, CTAB (Cetrimonium Bromide) surfactant was used. Investigation of structure, nanoparticle size, the shape of core-shell nanoparticles, and confirmation of crust formation around synthesized core-particle nanoparticles using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy tests (TEM) was performed. The coverage and stability of the suspension were also investigated by infrared spectroscopy (FTIR) and dynamic light scattering (DLS) tests.The average of 72.6 nm with mesoporous coating was synthesized from silica obtained from rice husk. Diagrams from the nitrogen adsorption and desorption test, which has a hysteresis ring, and the SAXS test confirm the existence of a mesoporous structure. The saturation magnetization of nanoparticles is in the proper range for biomedical applications.
  9. Keywords:
  10. Core-Shell Nanoparticle ; Microemulsion ; Rice Husk Ash ; Co-Precipitation ; Magnetic Silica Nanoparticles

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