Superstable Ultrathin Water Film Confined in a Hydrophilized Carbon Nanotube

Yoko Tomo, Alexandros Askounis, Tatsuya Ikuta, Yasuyuki Takata, Khellil Sefiane, Koji Takahashi

研究成果: ジャーナルへの寄稿学術誌査読

27 被引用数 (Scopus)

抄録

Fluids confined in a nanoscale space behave differently than in the bulk due to strong interactions between fluid molecules and solid atoms. Here, we observed water confined inside "open" hydrophilized carbon nanotubes (CNT), with diameter of tens of nanometers, using transmission electron microscopy (TEM). A 1-7 nm water film adhering to most of the inner wall surface was observed and remained stable in the high vacuum (order of 10-5 Pa) of the TEM. The superstability of this film was attributed to a combination of curvature, nanoroughness, and confinement resulting in a lower vapor pressure for water and hence inhibiting its vaporization. Occasional, suspended ultrathin water film with thickness of 3-20 nm were found and remained stable inside the CNT. This film thickness is 1 order of magnitude smaller than the critical film thickness (about 40 nm) reported by the Derjaguin-Landau-Verwey-Overbeek theory and previous experimental investigations. The stability of the suspended ultrathin water film is attributed to the additional molecular interactions due to the extended water meniscus, which balances the rest of the disjoining pressures.

本文言語英語
ページ(範囲)1869-1874
ページ数6
ジャーナルNano Letters
18
3
DOI
出版ステータス出版済み - 3月 14 2018

!!!All Science Journal Classification (ASJC) codes

  • バイオエンジニアリング
  • 化学 (全般)
  • 材料科学(全般)
  • 凝縮系物理学
  • 機械工学

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