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Electrophoretic Deposition of TiO2 Self-Cleaning Coatings

Horandghadim, Nazila | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40981 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Ghorbani, Mohammad; Dolati, Abolghasem
  7. Abstract:
  8. In this research, TiO2 nano-particles were electrophoretically deposited on the FTO glass to produce self-cleaning property. Two type of suspensions with different TiO2 nano-powders were used. Merck and fabricated by sol-gel route, TiO2 nano-powders were utilized in suspensions and Conductivity, pH and zeta potential of suspensions were determined. Electrophoretic deposition of two kind of suspensions was performed in different voltages of 10, 30 and 60V (for 10s) and room temperature. TiO2 coatings were sintered in 450oC for 1 hour. The phase transformation of TiO2 films were measured using XRD. Morphology, average particle size and thickness of TiO2 films were analyzed using FESEM microscope. The photocatalytic activity of TiO2 films was evaluated by the degadation of aqueous methyl orange (MO) under UV irradiation. The ultraviolet-visible spectrophotometer was used to record the changes of the absorbancy of the MO solution. The effect of applied voltage, type of suspension, duration of UV irradiation and type of irradiation (sun light or UV) on the photodegadation of MO solution were studied. Results represented that by increasing applied voltage from 10 to 60V, decomposition rates of MO solution by TiO2 films under UV irradiation for 1 hour, increases from 4% to 27%. The highest decomposition rate of MO solution (40%) was obtained under UV irradiation for 5 hours. Hydrophilicity of TiO2 films was determined by measuring contact angle of water droplet with surface of TiO2 films. It was observed that by increasing applied voltage from 10 to 60V, contact angles of water droplet with surface of films after UV irradiation for 2 hours, decrease from 40o to 00. In addition, surface topography of coatings were investigated by AFM.

  9. Keywords:
  10. Nanoparticles ; Self-Cleaning ; Photocatalyst ; Hydrofilicity ; Electrophoretic ; Titania

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