Fast Water Relaxation through One-Dimensional Channels by Rapid Energy Transfer

Tomonori Ohba, Keiko Ideta, Koichiro Hata, Seong-Ho Yoon, Jin Miyawaki, Kenji Hata

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Water in carbon nanotubes is surrounded by hydrophobic carbon surfaces and shows anomalous structural and fast transport properties. However, the dynamics of water in hydrophobic nanospaces is only phenomenologically understood. In this study, water dynamics in hydrophobic carbon nanotubes is evaluated based on water relaxation using nuclear magnetic resonance spectroscopy and molecular dynamics simulations. Extremely fast relaxation (0.001 s) of water confined in carbon nanotubes of 1 nm in diameter on average is observed; the relaxation times of water confined in carbon nanotubes with an average diameter of 2 nm (0.40 s) is similar to that of bulk water (0.44 s). The extremely fast relaxation time of water confined in carbon nanotubes with an average diameter of 1 nm is a result of frequent energy transfer between water and carbon surfaces. Water relaxation in carbon nanotubes of average diameter 2 nm is slow because of the limited number of collisions between water molecules. The dynamics of interfacial water can therefore be controlled by varying the size of the hydrophobic nanospace.

Original languageEnglish
Pages (from-to)3409-3415
Number of pages7
JournalChemPhysChem
Volume17
Issue number21
DOIs
Publication statusPublished - Nov 4 2016

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

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