Multiwalled ice helixes and ice nanotubes

Jaeil Bai, Jun Wang, X. C. Zeng

Research output: Contribution to journalArticlepeer-review

152 Scopus citations


We report six phases of high-density nano-ice predicted to form within carbon nanotubes (CNTs) at high pressure. High-density nano-ice self-assembled within smaller-diameter CNT (17,0) exhibits a double-walled helical structure where the outer wall consists of four double-stranded helixes, which resemble a DNA double helix, and the inner wall is a quadruple-stranded helix. Four other double-walled nano-ices, self-assembled respectively in two larger-diameter CNTs (20,0 and 22,0), display tubular structure. Within CNT (24,0), the confined water can freeze spontaneously into a triple-walled helical nano-ice where the outer wall is an 18-stranded helix and the middle and inner walls are hextuple-stranded helixes.

Original languageEnglish (US)
Pages (from-to)19664-19667
Number of pages4
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number52
StatePublished - Dec 26 2006


  • Carbon nanotube
  • High density nano-ice
  • Nano-ice helix

ASJC Scopus subject areas

  • General


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