title: FT-IR study of the interlamellar water confined in glycolipid nanotube walls.
abstract: The local hydrogen-bonding environment of water confined in glycolipid nanotubes (LNTs) was investigated by Fourier transform infrared (FT-IR) spectroscopy. Using X-ray diffraction (XRD), we estimated the thickness of an interlamellar water layer, which was confined between the bilayer membranes constructing the walls of the LNTs, to be 1.3 +/- 0.3 nm. FT-IR spectroscopic measurement of the confined water showed an obvious reduction in IR absorption in both the low-energy (around 3000 cm(-1)) and high-energy regions (around 3600 cm(-1)) of the OH stretching band as compared to bulk water. The reduction around 3000 cm(-1) indicated a decrease in the relative proportion of the water molecules with a long-range network structure due to a geometrical restriction. This agrees with the results obtained for other multilamellar systems. On the other hand, the remarkable reduction around 3600 cm(-1), which was not observed in the other systems, indicated the absence of weakly hydrogen-bonded water aggregates due to the effect of sugar headgroups.
authors: Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.
authors: Yanli
authors: Y
authors: Guo
authors: Hiroharu
authors: H
authors: Yui
authors: Hiroyuki
authors: H
authors: Minamikawa
authors: Mitsutoshi
authors: M
authors: Masuda
authors: Shoko
authors: S
authors: Kamiya
authors: j Tsuguo
authors: jT
authors: Sawada
authors: Kohzo
authors: K
authors: Ito
authors: Toshimi
authors: T
authors: Shimizu