State of water in amorphous silica samples from rice hulls: A 1H NMR study

被引：0
作者：
L. A. Zemnukhova
T. A. Babushkina
T. P. Klimova
机构：
[1] Russian Academy of Sciences,Institute of Chemistry, Far
[2] Russian Academy of Sciences,Eastern Division
来源：
Russian Journal of General Chemistry | 2007年 / 77卷
关键词：
Amorphous Silica; Water Proton; Rice Hull; Unfrozen Water; Moisten Sample;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Behavior of molecules of adsorbed water in rice hulls, weevil, and amorphous samples of carbon-containing (carbonized, SiO2 content 47%) and pure silica was studied by 1H NMR spectroscopy in the temperature range from 200 to 298 K. The temperature dependence of the signal intensity from humid samples shows a decrease in temperature of freezing of the adsorbed water and presence of unfrozen water. This dependence was used for estimating the pore size distribution. For pure amorphous silica, the pore diameter is in the range from 50 to 150 Å with a maximum at about 85 Å.
引用
收藏
页码：1008 / 1013
页数：5
相关论文
共 54 条
[1]  
Sergienko V.I.(2004)undefined Ross. Khim. Zh. 48 116-undefined
[2]  
Zemnukhova L.A.(2005)undefined Zh. Prikl. Khim. 78 324-undefined
[3]  
Egorov A.G.(2006)undefined Neorg. Mater. 42 27-undefined
[4]  
Shkorina E.D.(1990)undefined J. Chem. Phys. 93 9002-undefined
[5]  
Vasilyuk N.S.(2001)undefined Phys. Chem. Chem. Phys. 3 1185-undefined
[6]  
Zemnukhova L.A.(1974)undefined J. Colloid Interface Sci. 46 232-undefined
[7]  
Fedorishcheva G.A.(2004)undefined Chem. Eur. J. 10 5689-undefined
[8]  
Egorov A.G.(1997)undefined J. Chem. Phys. 106 7802-undefined
[9]  
Sergienko V.I.(2001)undefined J. Chem. Phys. 114 3258-undefined
[10]  
Zemnukhova L.A.(2004)undefined Ind. Eng. Chem. Res. 43 7920-undefined
123456