Published Research - Department of Chemistry


Date of this Version



Published in Proceedings of the National Academy of Sciences of the United States, vol. 103, no. 52 (December 26, 2006), pp. 19664-19667. Published online December 14, 2006. Copyright © 2006 National Academy of Sciences of the USA. Used by permission.


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 nanoice where the outer wall is an 18-stranded helix and the middle and inner walls are hextuple-stranded helixes.

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