Formation of ordered ice nanotubes inside carbon nanotubes

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

    Research output: Contribution to journalArticlepeer-review

    897 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
    Pages (from-to)802-805
    Number of pages4
    JournalNature
    Volume412
    Issue number6849
    DOIs
    Publication statusPublished - Aug 23 2001

    ASJC Scopus subject areas

    • General

    Fingerprint

    Dive into the research topics of 'Formation of ordered ice nanotubes inside carbon nanotubes'. Together they form a unique fingerprint.

    Cite this