液滴の蒸発に関する接触角の効果 : 光励起超親水化現象を用いた接触角の制御(<小特集>異相界面における諸現象の物理)

概要

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Titanium Dioxide, TiO_2, is one of the photocatalysts that has a very unique characteristic. The surface coated with TiO_2 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 TiO_2 surface by sputtering process. One is the copper surface with TiO_2 layer and the other is with TiO_2 and SiO_2 layer. The contact angle the former varies between 30-84° 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°.
一般社団法人日本機械学会の論文
2002-07-25