Viscosity and wetting property of water confined in extended nanospace simultaneously measured from highly-pressurized meniscus motion

Lixiao Li, Yutaka Kazoe, Kazuma Mawatari, Yasuhiko Sugii, Takehiko Kitamori

研究成果: Article査読

80 被引用数 (Scopus)

抄録

Understanding fluid and interfacial properties in extended nanospace (10-1000 nm) is important for recent advances of nanofluidics. We studied properties of water confined in fused-silica nanochannels of 50-1500 nm sizes with two types of cross-section: (1) square channel of nanoscale width and depth, and (2) plate channel of microscale width and nanoscale depth. Viscosity and wetting property were simultaneously measured from capillary filling controlled by megapascal external pressure. The viscosity increased in extended nanospace, while the wetting property was almost constant. Especially, water in the square nanochannels had much higher viscosity than the plate channel, which can be explained considering loosely coupled water molecules by hydrogen bond on the surface within 24 nm. This study suggests specificity of fluids two-dimensionally confined in extended nanoscale, in which the liquid is highly viscous by the specific water phase, while the wetting dynamics is governed by the well-known adsorbed water layer of several-molecules thickness.

本文言語English
ページ(範囲)2447-2452
ページ数6
ジャーナルJournal of Physical Chemistry Letters
3
17
DOI
出版ステータスPublished - 2012 9 6
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)
  • 物理化学および理論化学

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