Author/Authors :
Maniwa، نويسنده , , Yutaka and Kataura، نويسنده , , Hiromichi and Abe، نويسنده , , Masatoshi and Udaka، نويسنده , , Akiko and Suzuki، نويسنده , , Shinzo and Achiba، نويسنده , , Yohji and Kira، نويسنده , , Hiroshi and Matsuda، نويسنده , , Kazuyuki and Kadowaki، نويسنده , , Hiroaki and Okabe، نويسنده , , Yutaka، نويسنده ,
Abstract :
We report on a systematic X-ray diffraction analysis for the ordered water inside single-walled carbon nanotubes (SWNTs) with diameters of 10.9–15.2 Å. Four distinct ordered structures identified in this diameter range were assigned to polygonal ice-nanotubes predicted by molecular dynamics (MD) calculations. The ordering transition temperature rose from 190 K of octagonal ice-nanotubes to 300 K of pentagonal ice-nanotubes without applying high pressure when the SWNT diameter decreased. The results indicate a crossover from bulk to atomic scale phenomena with decreasing SWNT diameter.
