Control of wetting on Ti-based bulk metallic glass surfaces by a hydrothermal method

Ken Ichi Katsumata, Takeshi Wada, Akihisa Inoue, Munetoshi Sakai, Akira Nakajima, Akira Fujishima, Nobuhiro Matsushita, Kiyoshi Okada

Research output: Contribution to journalArticlepeer-review

Abstract

The surfaces of the Ti-based bulk metallic glasses (Ti50Ni 20Cu25Sn5) were modified by a hydrothermal method using sodium hydroxide (NaOH) solution, and the surface wettability was investigated. No reflections were observed in the XRD patterns of the NaOH-treated samples even though there was a clear change of the color, indicating formation of amorphous oxide phases. The Raman spectra showed peaks attributed to sodium titanate compounds (Na-O-Ti) and titanium oxide. Some of the samples were observed to have a very rough surface microstructure such as a "house-of-cards" or leaf-like structure. The water contact angle of the treated samples decreased with increasing treatment temperature and time. These results indicate that the wettability of the sample surface was able to be controlled from hydrophobic to hydrophilic by changing the conditions of the hydrothermal treatment.

Original languageEnglish
Pages (from-to)3430-3435
Number of pages6
JournalJournal of Materials Science
Volume46
Issue number10
DOIs
Publication statusPublished - 2011 May

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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