Effect of iron oxide coatings on electrophoretic mobility and dispersion of allophane
Effect of iron oxide coatings on electrophoretic mobility and dispersion of allophane
复制标题
氧化铁涂层对水铝英石电泳迁移率和分散性的影响
DOI：
10.1016/0021-9797(83)90386-7
复制
发表时间：
1983
影响因子：
9.9
通讯作者：
G. Galindo
中科院分区：
文献类型：
--
作者：
M. Escudey;G. Galindo
采用电泳迁移率测定方法研究了氧化铁涂层对智利火山灰土中无机粘土级硅铝酸盐表面的影响。对allophane测定的电荷零点（ZPC）约为4.5。当表面组成代表颗粒的整体组成时，理论计算的ZPC值与电泳迁移测定的值一致。得到的氧化铁包覆颗粒的ZPC值约为9.3，与计算和测定的非晶氧化铁和氧化铝的ZPC值相似。实验证据支持这样的假设，即这些天然无机颗粒的表面性质主要由氧化铁决定，其次由八面体配位铝决定。
The effect of iron oxide coatings on surfaces of inorganic clay-size aluminosilicates extracted from Chilean volcanic ash soils was studied by electrophoretic mobility measurements. The zero point of charge (ZPC) determined for allophane is around 4.5. Theoretically computed values of ZPC are coincident with those determined by electrophoretic migration when surface compositions are representative of the whole composition of the particles. The ZPC values obtained for iron oxide-coated particles, about 9.3, are similar to those computed and determined for noncrystalline iron and aluminum oxides. Experimental evidence supports the assumption that surface properties of these natural inorganic particles are mainly determined by iron oxides and secondarily by octahedrically coordinated aluminum.