Orientational order in gravity dispersed clay colloids: A synchrotron x-ray scattering study of Na fluorohectorite suspensions

被引：52

作者：

DiMasi, E. ^{[1
]}

Fossum, J.O. ^{[1
]}

Gog, T. ^{[1
]}

Venkataraman, C. ^{[1
]}

机构：

[1] Physics Department, Brookhaven National Laboratory, Upton, NY 11973-5000, United States

来源：

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | 2001年 / 64卷 / 6 I期

关键词：

Anisotropy - Clay - Crystal orientation - Gels - Gravitation - Morphology - Nematic liquid crystals - Salts - Solutions - Suspensions (fluids) - Synchrotron radiation - X ray diffraction;

D O I：

10.1103/PhysRevE.64.061704

中图分类号：

学科分类号：

摘要：

Gravity-dispersed phases in suspensions of the synthetic clay Na fluorohectorite in aqueous solutions of 10-4-10-2M NaCl were studied. Two distinct anisotropic gel regions, a nematic gel and a gel characterized by a small and nonuniform anisotropy in particle orientation, were identified. Higher NaCl concentrations were found to have two clear effects. An isotropic slowly gelling suspension was stable over two weeks at 10-4 and 10-3M NaCl, while at 8×10-3 and 1.3×10-2M NaCl rapid flocculation of this layer occurred. Furthermore, at higher NaCl concentrations the gels were composed of thicker and more monodisperse particles. No evidence was found for stable, isotropic gels composed of aggregates having the house of cards structure.

引用

页码：1 / 061704