Water confined in extended-nano spaces studied by NMR spectroscopy: A three-phase model

Takehiko Tsukahara, Wataru Mizutani, Akihide Hibara, Takehiko Kitamori

Research output: Contribution to conferencePaperpeer-review

Abstract

This report describes characterization of molecular motions of water confined in well-defined 10 nm - 100 nm scale channels on a microchip (called extended-nano spaces) based on NMR spectroscopy results. We found that the relaxation rates of water were increased by size-confinement in the range of not only 200 - 800 nm but also 4 - 40 nm, while the rates did not depend on the space sizes of 40 - 200 nm. These results could be expressed quantitatively by a three-phase exchange model suggesting that the water motions in extended-nano spaces are controlled by the fraction of three phases, including the bulk phase (SB), the proton transfer phase (SP), and the adsorbed phase (Sa).

Original languageEnglish
Pages546-548
Number of pages3
Publication statusPublished - 2006 Jan 1
Externally publishedYes
Event10th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2006 - Tokyo, Japan
Duration: 2006 Nov 52006 Nov 9

Other

Other10th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2006
CountryJapan
CityTokyo
Period06/11/506/11/9

Keywords

  • Extended-nano space
  • NMR
  • Proton transfer
  • Relaxation
  • Water

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Bioengineering

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