Guo Yanli, Yui Hiroharu, Minamikawa Hiroyuki, Masuda Mitsutoshi, Kamiya Shoko, Sawada j Tsuguo, Ito Kohzo, Shimizu Toshimi
Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.
Langmuir. 2005 May 10;21(10):4610-4. doi: 10.1021/la046906q.
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.
通过傅里叶变换红外（FT-IR）光谱研究了限制在糖脂纳米管（LNTs）中的水的局部氢键环境。利用X射线衍射（XRD），我们估计层间水层的厚度为1.3±0.3nm，该水层限制在构成LNTs壁的双层膜之间。与大量水相比，对受限水的FT-IR光谱测量显示，在OH伸缩带的低能量区域（约3000cm⁻¹）和高能量区域（约3600cm⁻¹），红外吸收均明显降低。3000cm⁻¹附近的降低表明由于几何限制，具有长程网络结构的水分子的相对比例降低。这与其他多层系统的结果一致。另一方面，在其他系统中未观察到的3600cm⁻¹附近的显著降低表明，由于糖头基的作用，不存在弱氢键结合的水聚集体。
