1994 Volume 33 Issue 4 Pages 215-222
Layered polysilicates consist of silica as a major constituent with alkali ions and water molecules. Magadiite and kenyaite, which are well-known compounds of layered polysilicates, and their silicic acids have been noted as host materials for intercalation and ion-exchange. However, detailed crystal structure and ion-exchange properties of these compounds have not been clarified. They carry silanol group on internal surface and exhibit ion selectivity of H+>Na+>Li+>K+. Furthermore, they have micropore “8-membered ring” built up with SiO4-tetrahedra layers and no Al in the framework. From above points of view, these compounds show different properties from clay minerals and are therefore expected to provide new materials.
Particular attention is directed to the potential of these compounds for applications relating to their properties such as thermal stability based on dehydration and rehydration, dispersion of the particles and gas adsorption. An idea to prepare porous materials from layered polysilicates by intercalation is also considered.
