Perdigon-Aller Ana C, Aston Mark, Clarke Stuart M
BP Institute, Department of Chemistry, University of Cambridge, Cambridge, UK.
J Colloid Interface Sci. 2005 Oct 1;290(1):155-65. doi: 10.1016/j.jcis.2005.04.038.
The orientational order parameter of dense colloidal dispersions of plate-like particles as a function of volume fraction is measured using neutron diffraction. This non-invasive experimental approach directly provides the full particle orientation distribution from which the order parameters can be calculated. The orientation parameters are shown to be linked to the solids fractions of the cakes and the macroscopic permeability of the samples. However, this study suggests that, although orientation can be relevant for a given system, other factors can have a stronger influence, for example, the degree of dispersion or colloidal stability of the clay and may be the principle factor that controls permeability. In addition, we report enhanced ordering of these materials under the influence of an external cross-flow field.
利用中子衍射测量了片状颗粒致密胶体分散体的取向序参数随体积分数的变化。这种非侵入性实验方法直接提供了完整的颗粒取向分布，由此可计算序参数。结果表明，取向参数与滤饼的固体分数和样品的宏观渗透率有关。然而，本研究表明，尽管取向可能与特定系统相关，但其他因素可能有更强的影响，例如，粘土的分散程度或胶体稳定性，并且可能是控制渗透率的主要因素。此外，我们报告了这些材料在外部错流场影响下有序性增强。
