Differential scanning calorimetry and X-ray diffraction study of water confined in silica gel for several levels of hydration

被引：6
|
作者：
Fouzri, A [1 ]
Dorbez-Sridi, R [1 ]
Oumezzine, M [1 ]
机构：
[1] Fac Sci Monastir, Dept Phys, Lab Physicochim Struct, Monastir 5019, Tunisia
来源：
EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS | 2003年 / 22卷 / 01期
关键词：
D O I：
10.1051/epjap:2003011
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Differential scanning calorimetry (DSC) and X-ray scattering measurements on water confined in silica gel is studied for several levels of hydration at room temperature and down to 77 K. The DSC analysis of water confined in silica gel in function of the level of hydration shows that the solidi. cation of water inside the pore is sensitive to the pore opening but the fusion is closely related to the curve of the pore. The X-ray pair correlation function showed the presence of a distorted tetrahedral-like hydrogen-bonded network of water characterized by the peaks at similar to2.8, similar to4.1 and similar to4.9 Angstrom. This distortion is caused by the competition between confinement effect and silica-water interaction. To eliminate the contribution of the water-silica gel interaction we have determined the structure of confined water by subtraction of the feebly hydrated silica gel from that strongly hydrated sample. The pair correlation function of extracted water show an oxygen-oxygen correlation at 3.8 Angstrom. A similar peak is observed in the case of water confined in polyHEMA, in charcoal and at vicinity of myoglobin.
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页码：21 / 28
页数：8
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