| Wettability is one of the most significant properties of solid surfaces, super-hydrophobic is a special kind of surface wettability,among which super-hydrophobic surfaces are being and will be widely used in everyday life, industry and national defence. The major factors affect the surface wettability of solid surface are the micro-nano structure and the low surface energy materials. Altering smooth surface chemical composition alone or solid surface simply have micro-nano structure, it is difficult to obtain ultra-hydrophobic surfaces. So, the combination of surface topography and micro-nano surface structure plays a key role in controlling surface wettbility.Titanium dioxide is a kind of important inorganic functional materials, it is widely used because of its special optoelectronic properties and catalytic. The tubular TiO2has attracted much attention due to its special structure and higher specific surface area. The titanium dioxide nanotubes array film has a variety of preparation methods, among which the anodic oxidation process is one of the best preparation whic is simple, economy and environmental protection. Titanium dioxide nanotubes array film has some advantages like tube diameter uniformity, thick film and combined with the basal strongly which is prepared in anodic oxidation method.In this paper, TiO2nanotube arrays were obtained by anodic oxidation of high purity titanium. And the TiO2nanotube arrays were very suitable for hydrophobic modification due to its tubular structure, basing on which preparation and wettability research of surface topography were achieved. And the super hydrophobic surface was prepared successfully by trying new methods, and the following work has been done:(1)The titanium dioxide nanotube array films were prepared by anodization and the impact of preparations parameters including the composition of electrolyte, voltage, temperature on the growth of titanium dioxide nanotubes was research. The experiment proved that there will be many differents of nanotube arrays’surface topography when the type of electrolyte is different; the growth of nanotube needs some time so the anodic oxidation time have a great influence on the film morphology; each kind of electrolyte fits its appropriate range of anodic oxidation voltage, the anodic oxidation voltage doesn’t in the resonable range can not get nanotube array; the cathode anode spacing have a little influence on the film morphology.(2)Super-hydrophobic surfaces were obtained by depositing materials of low surface energy on the titanium dioxide nanotubes array film surfaces, and the contact angle with water was increased after modifying. Effect of kinds of processes on the super-hydrophobic surfaces was discussed including electrolyte, surface roughness, diameter of nano-tubes, thickness of the titanium dioxide nanotubes array film and time of depositing materials of low surface energy. The method was proposed that can obtain great sltra-hydrophobic surfaces with a large advancing contact angle and a small contact angle hysteresis. The surface roughness of the nanotube arrays and the diameter of the nanotube have a irregular influence on the wettability of the nanotube arrays; the sample will have the best wettability when the electrolyte concentration and the anodic oxidation voltage are appropriate; the sample will have the best wettability when the anodic oxidation time is long enough.(3)The titanium dioxide nanotube array films with different morphology were prepared by trying some new preparation methods. And the super-hydrophobic surface was prepared by modifying materials of low surface energy on the titanium dioxide nanotube array films surfaces. The mechanism of the realization of super hydrophobic of the titanium dioxide nanotube array film which is prepared in two steps anodic oxidation method were discussed. |
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