Ion-specific strength of attractive particle networks
Ion-specific strength of attractive particle networks
复制标题
DOI：
10.1021/la9815345
复制
发表时间：
1999-06-22
期刊：
影响因子：
3.9
通讯作者：
Healy, TW
中科院分区：
文献类型：
--
作者：
Franks, GV;Johnson, SB;Healy, TW
用叶片工具法测定了氧化铝悬浮液的剪切屈服应力随各种反离子浓度的变化。用IO 3-、BrO 3-、Cl-、NO3-和ClO 4-的钠盐使pH低于等电点的浆料凝固。结构标记离子（IO 3-和BrO 3-）产生最强的颗粒网络，而结构破坏离子（ClO 4-，NO3-和Cl-）产生较弱的网络。电动结果（zeta电位）表明，结构制造商吸附在剪切平面内的更大的数量，因此更有效地崩溃的双层。在IO 3-的情况下的高屈服应力不能完全解释的概念截断的货车范德华吸引力在距离有关的离子的大小。当考虑到额外的吸引力或更近的接近距离的可能性时，结果可以得到充分的解释。对于氧化锆观察到类似的结果。
The shear yield stress of alumina suspensions was measured by the vane tool technique, as a function of high concentration of various counterions. Slurries at pHs below the isoelectric point were coagulated with the sodium salts of IO3-, BrO3-, Cl-, NO3-, and ClO4-. Structure maker ions (IO3- and BrO3-) produced the strongest particle networks, while structure breaker ions (ClO4-, NO3-, and Cl-) produced weaker networks. Electrokinetic results (zeta potentials) suggest the structure makers adsorb inside the shear plane in greater quantities and are thus more efficient in collapsing the double layer. The high yield stresses in the case of IO3- cannot be fully explained by the concept of truncating the van der Waals attraction at a distance related to the size of the ion. When the possibility of either an additional attraction or a closer distance of approach is considered, the results can be adequately explained. Similar results were observed for zirconia.