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Production of Zinc Nanoparticles by Electromagnetic Levitation Melting Method

Kazembeyki , Maryam | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47903 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Halali, Mohammad
  7. Abstract:
  8. In This project high purity Zinc (Zn) Nanoparticles were synthesized using Electromagnetic Levitation Melting Gas Condensation method. In this method the designed coil plays an important role on melting and suspension of the material and our design was costumed specifically for zinc nanoparticles. For each batch of synthesized Zn nanoparticles, 1.5 gr zinc platelet was levitated in the costumed coil and the effect of different parameters on the size and distribution of nanoparticles, was investigated including in- different cooling gas (He, N2 and Argon), gas flow rate, and the pressure inside the chamber. Inert gas was used to cool supersaturated vapor above the molten droplet and eliminate oxidation and agglomeration of nanoparticles. Synthesized nanoparticles extracted from chamber and suspended in normal–hexane. To characterize the nanoparticles, different techniques were used. Particle size and morphology was examined using Field Emission Scanning Electron Microscopy (FE-SEM). The impurity was checked by using Energy dispersive X-ray analysis (EDAX), and the size distribution was investigated using Dynamic light scattering (DLS). Results stated that the mean size of high purity Zn nanoparticles is different depending upon used cooling gas (21.5 nm for He, 63.8nm for N2 and 91.3nm for Ar). Also, increasing the gas flow rate and temperature, decreases the average size of nanoparticles
  9. Keywords:
  10. Electromagnetic Levitation ; Inert Gas Condensation (IGC) ; Gas Condensate ; Zinc Nanoparticles

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