Surface thermodynamic properties of micas and related layer silicate minerals
Surface thermodynamic properties of micas and related layer silicate minerals
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DOI：
10.1080/01932699808913214
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发表时间：
1998-01-01
影响因子：
2.2
通讯作者：
van Oss, CJ
中科院分区：
文献类型：
--
作者：
Giese, RF;Wu, W;van Oss, CJ
本文研究了一系列具有不同结构特征的2：1层状硅酸盐矿物的表面张力值，其层电荷范围为0 ~ 2/O ~（-10）。对于层电荷大于零的那些矿物，平均Lifshitz-van der Waals分量（伽马（LW））值为40.3 +/- 1.9 mJ/m（2），平均刘易斯酸（伽马（+））参数为1.2 +/- 0.6 mJ/m（2）。相比之下，刘易斯基本参数（gamma（-））变化很大，从最大值59.7 mJ/m（2）到最小值23.7 mJ/m（2）。那些层电荷为零的矿物（三个样品）的伽马（LW）值较小，为32.0 +/- 1.6 mJ/m（2），伽马（+）值略大，为2.0 +/- 0.4 mJ/m（2），伽马（-）值明显较小，为4.5 +/- 1.6 mJ/m（2）。因此，蒙脱石的亲水性是由电荷不平衡的离子取代决定的，这些离子取代吸引亲水性层间阳离子并使颗粒表面的相邻氧原子亲水。
The surface tension values for a series of 2:1 phyllosilicate minerals with different structural characteristics and layer charges ranging from 0 to 2 per O-10 group have been examined. The average Lifshitz-van der Waals component (gamma(LW))value is 40.3 +/- 1.9 mJ/m(2), and the average Lewis acid (gamma(+)) parameter is 1.2 +/- 0.6 mJ/m(2) for those minerals with a layer charge greater than zero. In contrast, the Lewis base parameter (gamma(-)) varied greatly from a maximum of 59.7 mJ/m(2) to a minimum of 23.7 mJ/m(2). Those minerals with a layer charge of zero (three samples) had smaller gamma(LW) values of 32.0 +/- 1.6 mJ/m(2), slightly larger gamma(+) values of 2.0 +/- 0.4 mJ/m(2) and significantly smaller values of gamma(-) of 4.5 +/- 1.6 mJ/m(2). The hydrophobic versus hydrophilic character of these materials is largely governed by the value of gamma(-) which is strongly related to the value of the layer charge.Thus, the hydrophilicity of a smectite is determined by the charge unbalancing ionic substitutions which attract hydrophilic interlayer cations and render adjacent oxygen atoms of the particle surface hydrophilic.