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Synthesis of ZnO and ZnO-TiO2 Nanocoatings by Sol-Gel Methode and Study in Their Antibacterial and Photocatalyst Properties

Nournia, Shayan | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47543 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Dolati, Abolghasem
  7. Abstract:
  8. The goal of this study is synthesis of nanocoating on basis of ZnO by Sol-Gel method and evaluation of their antibacterial and photocatalyst properties changes by different values of TiO2. For this purpose in both method of synthesis contents of TiO2 hase been changed from 0-25 molar percent. Dip coat method has been used for coating from sol with 1.4 mm/s withdrawal speed and 2 minute immersion time. After each step of coating samples has been dried at 150oC for 10 minute and for increasing thickness this process has been repeated 4 times. In first method zinc acetate dihydrate in 0.1 M final concentration and titanium tetraisopropoxide are sol precursors at in situ way of synthesis. In this way ZnO-0%TiO2 composite with 15% efficiency has best for degradation methyleneblue at 90 minute. Heat treatment of this coatings at 500oC for 1 hour at atmosphere increase photocatalyst properties, which ZnO-25%TiO2 with 68% degradation efficiency is the optimum one. In second method that has been synthesized by suspending TiO2 at anatas phase in ZnO sol with 0.1 M zinc acetate dihydrate concentration, ZnO-5%TiO2 with 30% degradation efficiency is the optimum composite. In coatings that has been obtained from first method, ZnO-0%TiO2 could deactivated SRB bacteria under 10 hour sun illumination with 90% antibacterial efficiency. On the other hand ZnO-5%TiO2 which obtained from second method at same condition has 99% antibacterial efficiency. Heat treated coats with ZnO-25%TiO2 under polarization test in 3.5% NaCl media and dark conditions can reduce corrosion current density from 4.95 to 0.3 µA/cm2 and cause negative shift in corrosion potential from -250mv to -400 mv under ultra violet radiation
  9. Keywords:
  10. Zinc Oxide ; Titanium Oxide ; Antibacterials ; Photocatalyst ; Sol-Gel Method

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