Structures of water molecules in carbon nanotubes under electric fields

Winarto, Daisuke Takaiwa, Eiji Yamamoto, Kenji Yasuoka

研究成果: Article査読

38 被引用数 (Scopus)


Carbon nanotubes (CNTs) are promising for water transport through membranes and for use as nanopumps. The development of CNT-based nanofluidic devices, however, requires a better understanding of the properties of water molecules in CNTs because they can be very different from those in the bulk. Using all-atom molecular dynamics simulations, we investigate the effect of axial electric fields on the structure of water molecules in CNTs having diameters ranging from (7,7) to (10,10). The water dipole moments were aligned parallel to the electric field, which increases the density of water inside the CNTs and forms ordered ice-like structures. The electric field induces the transition from liquid to ice nanotubes in a wide range of CNT diameters. Moreover, we found an increase in the lifetime of hydrogen bonds for water structures in the CNTs. Fast librational motion breaks some hydrogen bonds, but the molecular pairs do not separate and the hydrogen bonds reform. Thus, hydrogen bonds maintain the water structure in the CNTs, and the water molecules move collectively, decreasing the axial diffusion coefficient and permeation rate.

ジャーナルJournal of Chemical Physics
出版ステータスPublished - 2015 3月 28

ASJC Scopus subject areas

  • 物理学および天文学(全般)
  • 物理化学および理論化学


「Structures of water molecules in carbon nanotubes under electric fields」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。