Rewritable superhydrophilic-superhydrophobic patterns on a sintered titanium dioxide substrate

Kazuya Nakata, Shunsuke Nishimoto, Yumi Yuda, Tsuyoshi Ochiai, Taketoshi Murakami, Akira Fujishima

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

This Letter describes a new fabrication process for superhydrophilic- superhydrophobic patterns on a TiO 2 surface using a combination of an inkjet technique and the site-selective decomposition of a self-assembled monolayer (SAM) by a photocatalytic reaction under UV irradiation. To induce high surface wettability, we carried out simple calcination of a Ti substrate. The substrate was thus oxidized to titanium oxide and had a vortex-like rough morphology, which was suitable for the formation of wettability patterns. Furthermore, the substrate can be regenerated after elimination of the superhydrophilic-superhydrophobic patterns by the photocatalytic decomposition of TiO 2 using UV irradiation, and the patterns are deposited again. The renewed surface that we created had a wettability pattern that was different from the preceding pattern. This process is based on a TiO 2 surface and should offer a renewable, resource-saving, and environmentally friendly methodology for the formation of wettability patterns.

Original languageEnglish
Pages (from-to)11628-11630
Number of pages3
JournalLangmuir
Volume26
Issue number14
DOIs
Publication statusPublished - Jul 20 2010
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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