Instituto de Química-Física Rocasolano, CSIC, Serrano 119, E-28006 Madrid, Spain.
J Chem Phys. 2009 Dec 28;131(24):244701. doi: 10.1063/1.3273209.
The microporous structure of pillared interlayered clays is determined by their interlayer separation and the distribution of the pillars that separate their layers. The pillars provide stability to these quasi-two-dimensional high surface area materials. In this work we present a topological analysis of available and accessible volumes within various simple models of pillared interlayered clays. Each model is characterized by a distribution of pillars. Both fully ordered structures and disordered pillar distributions with either attractive or repulsive interpillar correlations are considered. Particular attention is paid to the problem of accessibility. In systems with similar degrees of porosity, even when cavities within each model might be able to host the same adsorbate molecules, their accessibility will strongly depend on the pillar distribution. The theoretical analysis presented in this work may facilitate the interpretation of experimental results, pointing out those quantities that are key to describe the texture of the porous material.
柱撑层状黏土的微孔结构由其层间间距和分隔层的柱体分布决定。这些柱体为这些准二维高表面积材料提供了稳定性。在这项工作中，我们对各种简单的柱撑层状黏土模型中的可用和可及体积进行了拓扑分析。每个模型都由柱体的分布来描述。既考虑了完全有序的结构，也考虑了具有吸引力或排斥性的柱间相关的无序柱体分布。特别关注了可及性问题。在具有相似孔隙度的系统中，即使每个模型内的空腔都能够容纳相同的吸附质分子，但其可及性将强烈取决于柱体的分布。本文提出的理论分析可以促进对实验结果的解释，指出那些对描述多孔材料结构至关重要的量。
