Formation of ordered ice nanotubes inside carbon nanotubes

Kenichiro Koga, G. T. Gao, Hideki Tanaka, X. C. Zeng

Research output: Contribution to journalArticle

808 Citations (Scopus)

Abstract

Following their discovery, carbon nanotubes have attracted interest not only for their unusual electrical and mechanical properties, but also because their hollow interior can serve as a nanometre-sized capillary, mould or template in material fabrication. The ability to encapsulate a material in a nanotube also offers new possibilities for investigating dimensionally confined phase transitions. Particularly intriguing is the conjecture that matter within the narrow confines of a Carbon nanotube might exhibit a solid-liquid critical point beyond which the distinction between solid and liquid phases disappears. This unusual feature, which cannot occur in bulk material, would allow for the direct and continuous transformation of liquid matter into a solid. Here we report simulations of the behaviour of water encapsulated in carbon nanotubes that suggest the existence of a variety of new ice phases not seen in bulk ice, and of a solid-liquid critical point. Using carbon nanotubes with diameters ranging from 1.1 nm to 1.4 nm and applied axial pressures of 50 MPa to 500 MPa, we find that water can exhibit a first-order freezing transition to hexagonal and heptagonal ice nanotubes, and a continuous phase transformation into solid-like square or pentagonal ice nanotubes.

Original languageEnglish (US)
Pages (from-to)802-805
Number of pages4
JournalNature
Volume412
Issue number6849
DOIs
StatePublished - Aug 23 2001

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Nanotubes
Carbon Nanotubes
Ice
Water
Phase Transition
Freezing
Fungi
Pressure

ASJC Scopus subject areas

  • General

Cite this

Formation of ordered ice nanotubes inside carbon nanotubes. / Koga, Kenichiro; Gao, G. T.; Tanaka, Hideki; Zeng, X. C.

In: Nature, Vol. 412, No. 6849, 23.08.2001, p. 802-805.

Research output: Contribution to journalArticle

Koga, K, Gao, GT, Tanaka, H & Zeng, XC 2001, 'Formation of ordered ice nanotubes inside carbon nanotubes', Nature, vol. 412, no. 6849, pp. 802-805. https://doi.org/10.1038/35090532
Koga, Kenichiro ; Gao, G. T. ; Tanaka, Hideki ; Zeng, X. C. / Formation of ordered ice nanotubes inside carbon nanotubes. In: Nature. 2001 ; Vol. 412, No. 6849. pp. 802-805.
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