Effect of contact angle on droplet evaporation (Control of contact angle by photo-induced hydrophilicity)

Yasuyuki Takata, Sumitomo Hidaka, Hiroshi Yamamoto, Tadamichi Nakamura, Masataka Masuda, Takehiro Ito

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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 TiO2 and SiO2 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°.

Original languageEnglish
Pages (from-to)1911-1918
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number671
Publication statusPublished - Jul 2002

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering


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