Negative thermal expansion of water in hydrophobic nanospaces.
Negative thermal expansion of water in hydrophobic nanospaces.
复制标题
疏水纳米空间中水的负热膨胀。
DOI：
10.1039/c1cp22954k
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
S. Ozeki
中科院分区：
文献类型：
--
作者：
Ryusuke Futamura;T. Iiyama;A. Hamasaki;S. Ozeki
用小角X射线散射（SAXS）和X射线衍射（XRD）方法研究了20 ~ 298 K温度范围内碳微孔（w = 1.36nm）中水的密度和分子间结构。SAXS结果表明，在很宽的温度范围内（20-277 K），微孔中的水的密度随着温度的升高而增加。密度变化了10%，这与20 K下的散装冰（I（c））和277 K下的水之间7%的密度变化相当。低温（低于200 K）下的XRD结果表明，水形成立方冰（I（c））结构，但随着温度的升高，其峰形和径向分布函数不断向类液体结构变化。小角X射线散射和X射线衍射结果均表明，疏水纳米空间中的水没有相变点。随着温度的升高，从冰I（c）到液体的连续结构变化表明，水在疏水纳米空间中在很宽的温度范围内显示出负热膨胀。XRD和SAXS测量的结合使得描述具有分子间结构和吸附分子组装体密度的纳米空间中的受限系统成为可能。
The density and intermolecular structure of water in carbon micropores (w = 1.36 nm) are investigated by small-angle X-ray scattering (SAXS) and X-ray diffraction (XRD) measurements between 20 K and 298 K. The SAXS results suggest that the density of the water in the micropores increased with increasing temperature over a wide temperature range (20-277 K). The density changed by 10%, which is comparable to the density change of 7% between bulk ice (I(c)) at 20 K and water at 277 K. The results of XRD at low temperatures (less than 200 K) show that the water forms the cubic ice (I(c)) structure, although its peak shape and radial distribution functions changed continuously to those of a liquid-like structure with increasing temperature. The SAXS and XRD results both showed that the water in the hydrophobic nanospaces had no phase transition point. The continuous structural change from ice I(c) to liquid with increasing temperature suggests that water shows negative thermal expansion over a wide temperature range in hydrophobic nanospaces. The combination of XRD and SAXS measurements makes it possible to describe confined systems in nanospaces with intermolecular structure and density of adsorbed molecular assemblies.
原位 XRD 和逆蒙特卡罗法直接测定吸附相分子间结构
DOI：
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发表时间：
2006
期刊：
Adsorption Science ＆ Technology 24
影响因子：
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作者：
T.Iiyama;R.Aragaki;T.Urushibara;S.Ozeki
通讯作者：
S.Ozeki
DOI：
10.1016/j.colsurfa.2004.04.008
发表时间：
2004-07
期刊：
Colloids and Surfaces A: Physicochemical and Engineering Aspects
影响因子：
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作者：
T. Iiyama;Y. Kobayashi;K. Kaneko;S. Ozeki
通讯作者：
T. Iiyama;Y. Kobayashi;K. Kaneko;S. Ozeki
ACF疏水纳米空间中D_2O纳米晶体形成及其动态方面的固态^2H NMR研究
DOI：
--
发表时间：
2007
期刊：
Chem. Lett 36
影响因子：
--
作者：
H.;Omichi;T.;Ueda;K.;Miyakubo;T.;Eguchi
通讯作者：
Eguchi