Regioselective Approach to Characterizing Increased Edge Availability in Layered Crystal Materials following Layer Expansion: Reaction of Kaolinite with Octadecyltrimethylammonium Salts

Effect of kaolinite edge surfaces on formation of Tb3+-doped phosphor by solid-state reaction

This study assessed the effect of kaolinite edge surfaces on solid-state reactions. Specifically, Tb³⁺-doped metastable CaAl₂Si₂O₈ showing green phosphorescence was prepared via a solid-state reaction between expanded kaolinite, a methoxy-modified kaolinite, having Tb³⁺ ions adsorbed on its edge surfaces and CaCO₃. This material cannot be obtained by the conventional grinding of kaolinite, CaCO₃ and Tb₂O₃, indicating that the use of kaolinite edge surfaces is advantageous as a means of achieving certain solid-state reactions.

The effect of kaolinite edge surfaces on a solid-state reaction was demonstrated by the synthesis of Tb³⁺-doped metastable CaAl₂Si₂O₈, indicating the importance of Tb³⁺ adsorbed on kaolinite edge surfaces.