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Hydrophilicity and AFM Based Surface Statistical Analysis of SiO2/TiO2/Glass Bilayer

Daryaei, Ebrahim | 2008

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39073 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Moshfegh, Alireza; Jafari, Golamreza
  7. Abstract:
  8. Titanium dioxide (TiO2) is important because of wide applications such as self cleaning surfaces and using in photoelectrochemical cells .Recent researches have shown that addition of silicon dioxide into TiO2 increases hydrophilicity of SiO2-TiO2 and improves surface properties. Until now a little research has been done on the double layer TiO2/SiO2 system; therefore, this system is suitable for studying. In general this thesis consists of theoretical and experimental parts .In the experimental part, multilayer systems of SiO2/TiO2/Glass have been selected (thickness of SiO2 is 20 nm) and surface morphology and hydrophilicity have been investigated by Atomic Force Microscopy (AFM) and measuring contact angle respectively. To achieve this goal, suitable roughness has been created by etching of KOH on the double layer SiO2/TiO2/Glass that was grown by sputtering. The effective parameters in the creation of roughness and hydrophilicity such as etching time and weight percentage of KOH solution have been studied. In the theoretical approach, it has been tried to investigate different models for description of growth and etching of surface with fractal concepts and critical phenomena. Also Markov process have been selected as one of the stochastic processes, by solving of Focker-planck equation, we are able to analyze experimental results by using stochastic approach. Some parameters such as diffusion and drift coefficients in the Focker-planck equation have been obtained. Finally to study surface roughness, level crossing approach has been used
  9. Keywords:
  10. Stochastic Process ; Surface Roughness ; Titanium Dioxide

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