Structural characterization of water and ice in mesoporous SBA-15 silicas: II. The 'almost-filled' case for 86 Å pore diameter.
Structural characterization of water and ice in mesoporous SBA-15 silicas: II. The 'almost-filled' case for 86 Å pore diameter.
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介孔 SBA-15 二氧化硅中水和冰的结构表征：II。
DOI：
10.1088/0953-8984/20/20/205107
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Seyed-Yazdi J
中科院分区：
文献类型：
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作者：
Seyed-Yazdi J
在300-100K的温度范围内，对孔径为86？的SBA-15硅胶中的D2O进行了中子衍射测量，其气孔填充因子为0.95，样品几乎被填满。在两种不同的冷却和升温循环中，确定了冰相的形核和转变。258K时的初始成核事件导致了以立方冰为主的缺陷形式的冰-I。对于低于主要成核事件的温度，数据表明形成了无序的水/冰界面层，该界面层随温度变化且是可逆的。水相的主要衍射峰显示出与早期研究中观察到的相似的特征，表明随着温度的降低，受限相的氢键和网络关联增强。所附论文(Seed-Yazdi等人，2008年《物理学杂志：简明》)提供了对三重峰的详细轮廓分析。物质20 205108)。
Neutron diffraction measurements for D 2 O in SBA-15 silica of pore diameter 86 Å have been made in a temperature range from 300 to 100 K. The pore-filling factor for the liquid phase is 0.95, resulting in an'almost-filled'sample. The nucleation and transformation of the ice phase were determined for cooling and warming cycles at two different rates. The primary nucleation event at 258 K leads to a defective form of ice-I with predominantly cubic ice features. For temperatures below the main nucleation event, the data indicate the formation of an interfacial layer of disordered water/ice that varies with temperature and is reversible. The main diffraction peak for the water phase shows similar features to those observed in earlier studies, indicating enhanced hydrogen bonding and network correlations for the confined phase as the temperature is decreased. A detailed profile analysis of the triplet peak is presented in the accompanying paper (Seyed-Yazdi et al 2008 J. Phys.: Condens. Matter 20 205108).