Anomalous hydration shell order of Na + and K + inside carbon nanotubes

Qing Shao, Jian Zhou, Linghong Lu, Xiaohua Lu, Yudan Zhu, Shaoyi Jiang

Research output: Contribution to journalArticlepeer-review

122 Scopus citations


We performed molecular dynamics simulations of the hydration of Na + and K + in infinitely long single-walled armchair carbon nanotubes (CNTs) at 298 K. Simulation results indicate that the preferential orientation of water molecules in coordination shells of these two cations presents an anomalous change in the CNTs and causes a diameter-dependent variation for the interaction energy between the cation and water molecules in its coordination shell. In the five CNTs of this work, it is energetically favorable for confining a hydrated K + inside the two narrow CNTs with diameters of 0.60 and 0.73 nm, whereas the situation is reverse inside the wide CNTs with diameters of 0.87,1.0, and 1.28 nm. This finding is important for CNT applications in ionic systems that control the selectivity and the Ionic flow.

Original languageEnglish
Pages (from-to)989-994
Number of pages6
JournalNano Letters
Issue number3
StatePublished - Mar 11 2009

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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