Titanium Dioxide, TiO2, is one of the photocatalysts that has a very unique characteristic. The surface coated with TiO2 exhibits extremely high affinity for water by exposing the surface to ultraviolet ray and the contact angle decreases nearly to zero. On the contrary, the contact angle increases when the surface is shielded from ultraviolet ray. We have developed two types of TiO2 surface by sputtering process. One is the copper surface with TiO2 layer and the other is with TiO 2 and SiO2 layer. The contact angle of the former varies between 30-82° and the latter varies between 4-13°. We applied these surfaces to control the contact angles with the other thermal properties of the surface being constant. Experiment of droplet evaporation has been performed to manifest the effect of contact angle on the evaporation curves. It is found that the wetting limit temperature increases as the contact angle decreases to 13°, but it decreases again as the contact angle decreases to 4°.
|ジャーナル||American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD|
|出版物ステータス||出版済み - 12 1 2001|
|イベント||2001 ASME International Mechanical Engineering Congress and Exposition - New York, NY, 米国|
継続期間: 11 11 2001 → 11 16 2001
All Science Journal Classification (ASJC) codes
- Mechanical Engineering
- Fluid Flow and Transfer Processes