ナトリウムモンモリロナイトの吸着水

概要

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The interlayer spacing of the sodium montmorillonite (Na-Mt) swollen by water in the content of 0.34 g water/g Na-Mt to 2.23 g water/g Na-Mt was measured using a small angle X-ray scattering method. Heat of fusion of frozen water in the mixture with Na-Mt was also measured using a differential scanning calorimeter (DSC). The interlayer spacing was 15 A for 0.34 g water/g Na-Mt and 19 A for 0.61 g water/g Na-Mt. Two phases, whose interlayer spacings were 19 A and 38 A, coexisted between 0.88g water/g Na=Mt and 1.15g water/g Na-Mt. When the water content was more than 1.15 g water/g Na-Mt, the interlayer spacing increased lineariy with increasing the water content. The interlayer spacing of the Na-Mt in the frozen state was 15 A for all water content region in this work. Heat of fusion obtained by the DSC measurement was 36cal/g Na-Mt less than that calculated by assuming that all water in the paste was frozen. These results suggested that in the mixture with Na-Mt the amount of unfrozen water at 200 K was 0.45 g water/g Na-Mt.
日本粘土学会の論文
1987-03-01