Published Research - Department of Chemistry


Date of this Version

November 2006


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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