Low-temperature structure formation and glass transition behaviors oflow-dimensional water

低维水的低温结构形成和玻璃化转变行为

基本信息

批准号：
18350003
负责人：
OGUNI Masaharu
金额：
$ 10.2万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18350003/
关键词：
Low-temperature properties Surface・Interface Thermal properties Mesoscopic systems 表面・界面物性

项目摘要

Static and dynamic properties of the water confined within nano-pores were studied by adiabatic calorimetry and DSC. The internal water within the pores of silica MCM-41 showed its glass transition at 160 K and then 210 K as the pole size increases, while the interfacial water at around 115 K. The 210 K is the glass transition temperature firstly observed and claimed.Inorganic and organic hybrid crystals [Ni(cyclam)(H2O)2]3・24H2O, [Co(H2bim)3](TMA)・0H2O, and [Cr(H2bim)3](TMA)・nH2O have pore diameters 1.0, 1.5, and 1.6 nm, respectively, with the pore wall structure of crystalline framework. No phase transition was observed in the first substance. The water within the nanopores in the latter two shoved its structural ordering and glass transitions, the cooperativeness in the ordering was higher in the Cr compound than in the Co one. While the interfacial water in MCM41 is disordered in any size, the one in these crystals famed the ordered structures conforming to the crystalline framewor … More k of the pore wall.InNa-RUB-18 crystal possessing nano-sheet water between day layers, the water without participating in the hydrogen-bond network showed a phase transition at 194 K and a glass transition at 106K. No anomaly was observed in the hydrogen-bond chain inclding silanol groups.It was found in methanol aqueous solutions within 1.1 nm pores of silica gel that the glass transition behavior in the high concentration region corresponds to that of the systems in which a hydrogen-bond network inherent to pure water is not formed, and that the inherent network is formed in the dilute region and accordingly the glass transition temperature increases rapidly to approach 160K in the pure water. The similar behavior was observed in the ethylene glycol aqueous solutions within MCM41 pores. On the other hand, it was suggested in hydroxylamine solutions that the hydrogen-bond network structure formed by water molecules is not destroyed by introduction of the second component, and a possibility was indicated that a kind of liquid-liquid phase transition occurs.It was concluded that water molecules forms their own characteristic hydrogen-bond network at low temperatures, and that the relaxation time and therefore the glass transition temperature jumps according to the stages of the development in the network. Less

通过绝热量热法和DSC研究了纳米pore中的水的静态和动态特性。二氧化硅MCM-41毛孔内的内水显示在160 K，然后在210 K处随着极尺寸的增加而显示其玻璃过渡，而界面水在115 K左右。110K是玻璃过渡温度，首先观察到并声称。 [CO（H2BIM）3]（TMA）・0H2O和[CR（H2BIM）3]（TMA）・NH2O分别具有孔径1.0、1.5和1.6 nm，具有结晶框架的孔隙壁结构。在第一种物质中未观察到相变。后两者中纳米孔中的水推入了其结构排序和玻璃跃迁，在CR化合物中的订单中的配位高于CO中的配位。虽然MCM41中的界面水在任何大小上都是无序的，但这些晶体中的界面水是符合晶体框架的有序结构的闻名……更多的毛孔孔。孔壁。Iinna-Rub-18晶体具有一日层之间的纳米层水，水之间的水，无需参与氢键网络，在194 K和106 k and glass thressition the Boldent bonge网络中都在106 k和106k上进行过渡。在氢键链中未观察到异常。在1.1 nm的二氧化硅凝胶孔内的亚甲基乙二醇溶液中发现，高浓度区域中的玻璃过渡行为对应于该系统的玻璃过渡行为，与氢键在纯水中均未形成的液体易于形成，并相应地在稀疏中形成了液体，并相应地构成了玻璃，并相应地构成了玻璃，并相应地构成了玻璃的温度。纯水。在MCM41孔内的乙二醇水溶液中观察到了相似的行为。另一方面，在羟胺溶液中建议，由水分子形成的氢键网络结构不会通过引入第二个成分而破坏，并且可能发生了可能发生的液 - 液相变过的可能性。结论得出的结论是，水分子在低温下的渗透到了玻璃的变化，因此，水分子形成了玻璃的特征，并且在玻璃中的渗透性，并在玻璃中的渗透性，并形成了玻璃的变化。在网络中。较少的