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

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2447-2452
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume3
Issue number17
DOIs
Publication statusPublished - 2012 Sep 6
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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