Properties Of Super-hydrophobic Coatings Constructed With Modified Titania Micro-nanoparticles

The thesis first reviewed the basic theory and recent progress on thesuperhydrophobic surface. It is known that a superhydrophobic surface is fabricated byconstructing a certain surface roughness and low surface free energy material. So, theorganic-inorganic nanocomposite superhydrophobic film possessing the criterionsshould show good superhydrophobic properties, which is made by organic andinorganic nanoparticles.The nano-titania was prepared by changing the reactants and react conditions toobtain virous particle-size. The amount of reactant, temperature, and pH values affectthe gelation remarkly, which could be selected to prepare different organic-inorganicsuperhydrophobic surfaces. The vinyltriethoxysilane modified titanium dioxidesuperhydrophobic films were prepared by add the vinyltriethoxysiloyl onto the danglingbonds of titanium dioxide. The amount of vinyltriethoxysilane and reaction time affectthe superhydrophobicity of the surface, and the optimal amount of reactants wasobtained after a series of failed attempts. The organic-inorganic nanocomposite filmswere fabricated by grafting the polystyrene onto the vinyltriethoxysilane modifiedtitanium oxide nanopowders using free radical polymerization. It shows both organicand inorganic properties, and the wetting performance is better than thevinyltriethoxysilane modified titanium dioxide superhydrophobic films. Themorphology of the films and the structure of the PS grafted titanium oxide wereexamined by Field Emission Scanning Electron Microscope, Fourier transform infraredspectroscopy, Differential Scanning Calorimetry and X-ray diffraction. Then thePS/TiO2nanocomposite superhydrophobic surface was prepared using simple and easymethod with low cost.