Controlled contact angle and droplet evaporation using photo-induced hydrophilic surface

Yasuyuki Takata, T. Nakamura, M. Masuda, S. Hidaka, H. Yamamoto, T. Ito

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

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°.

Original languageEnglish
Pages (from-to)315-321
Number of pages7
JournalAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
Volume369
Issue number1
Publication statusPublished - Dec 1 2001
Event2001 ASME International Mechanical Engineering Congress and Exposition - New York, NY, United States
Duration: Nov 11 2001Nov 16 2001

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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