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Relationship between surface charge and water characteristic curve of clays

粘土表面电荷与水特性曲线的关系

基本信息

批准号：
06660294
负责人：
KARUBE Jutaro
金额：
$ 1.34万
依托单位：
IBARAKI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06660294/
关键词：
Allophane Charge Water characteristic curve Clay

项目摘要

Allophane colloid, separated from air-dried soil, showed lower water content than that from fresh soil by 23-29% over the range from -1.4JKg^<-1> to -800JKg^<-1> of matric potential. Since both samples were prepared to be less than 50 nm in Stokes'diameter, this irreversibility was ascribed to submicroscopic irreversible aggregation. Water characteristic curves of allophane colloid separated from fresh soil were coincident regardless of different pHs, i.e.different surface charges below -100JKg^<-1>, and diverged gradually above -100JKg^<-1>, from 3.1 nm in average particle separation. The lower the sbsolute value of allophane charge was, the higher the water content was above -100JKg^<-1>. Water characteristic curves of allophane were irreversible except for highly charged one above -100JKg^<-1>. The water content of imogolite was higher that of montmorillionite at any matric potential, and showed more than twice as much as that of allophane below -10JKg^<-1>. The water content of allophane was higher than that of montmorillonite above -400JKg^<-1>. When montmorillonite was mixed with allophanic clay, the water content became higher than either of clays in the range from -100JKg^<-1> to -800JKg^<-1> due to intercalation. The high water retentivity of imogolite can be explained not only in terms of it's high specific surface area but also submicroscopic pores made up by intertwined fibrous particles.

从风干土壤中分离出的水铝英石胶体，在基质势为-1.4 ~-800JKg^2范围内，其含水量比新鲜土壤低23-29%<-1><-1>。由于两种样品的斯托克斯直径均小于50纳米，因此这种不可逆性归因于亚微观不可逆聚集。从新鲜土壤中分离出的水铝英石胶体的水特征曲线在-100 JKg/L以下与pH值无关，即表面电荷不同，水特征曲线基本一致，<-1>在-100 JKg/L以上，水特征<-1>曲线从平均粒径3.1 nm开始逐渐发散。水英石电荷的sbsolute值越低，含水量越高，在-100JKg ^以上<-1>。水铝英石的水特征曲线除-100JKg^2以上的高电荷水特征曲线外，其余均为不可逆的<-1>。在任何基质势下，伊毛戈兰的含水量都高于蒙脱石，在-10JKg ^以下，伊毛戈兰的含水量是水铝英石的两倍多<-1>。水铝英石的含水量高于蒙脱石，在-400 JKg/g以上<-1>。当蒙脱石与脲基膨润土混合时，由于插层作用，在-100 JKg ^~-800 JKg ^范围内，水含量变得高于任何一种粘土<-1><-1>。伊毛戈兰的高保水性不仅与其高的比表面积有关，还与其内部由纤维状颗粒交织而成的亚微观孔隙有关。