Rheological and Electrokinetic Properties of Sodium Montmorillonite Suspensions.
Rheological and Electrokinetic Properties of Sodium Montmorillonite Suspensions.
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DOI：
10.1006/jcis.2000.6957
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发表时间：
2000-09
影响因子：
9.9
通讯作者：
F. Arroyo;F. Carrique;M. L. Jiménez-Olivares;Ángel V. Delgado
中科院分区：
文献类型：
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作者：
F. Arroyo;F. Carrique;M. L. Jiménez-Olivares;Ángel V. Delgado
在这篇文章中，我们描述了钠蒙脱石悬浮液的流变性作为pH值的函数，在恒定的离子强度。所观察到的行为进行了定量讨论颗粒之间的相互作用的势能，记住粘土颗粒的各向异性性质。扩展的DLVO模型，其中包括静电，货车的德瓦尔斯，和极性的酸碱贡献的总能量。据发现，面对面的相互作用几乎是独立的pH值，而边缘到边缘的相互作用是最有吸引力的边缘的等电点（pH值约为7）。最显着的变化发生在面对边缘的势能，在pHG”的强吸引力，差异较大的酸性pH值。这些结果，除了势能计算，建议存在的弹性，凝固的结构，pH值高达7，而随着pH值的增加，这种结构是更放松，因为静电排斥。蠕变恢复数据进行分析时，得出类似的结论。版权所有2000学术出版社。
In this article, we describe the rheology of Na montmorillonite suspensions as a function of pH, at constant ionic strength. The observed behavior is discussed quantitatively in terms of the potential energy of interaction between particles, keeping in mind the anisotropic nature of clay particles. The extended DLVO model that includes electrostatic, van der Waals, and polar acid-base contributions to the total energy is used. It is found that face-to-face interactions are virtually independent of pH, whereas edge-to-edge interactions are most attractive at the isoelectric point of edges (pH approximately 7). The most significant variations occur in face-to-edge potential energy, with strong attractions at pHG", the difference being larger at acid pH values. These results, in addition to potential energy calculations, suggest the existence of an elastic, coagulated structure up to pH 7, whereas as the pH is increased such structure is more relaxed because of electrostatic repulsions. Similar conclusions are reached when creep-recovery data are analyzed. Copyright 2000 Academic Press.