Hetero Coagulation of Layered Metal Hydroxide Salt and Nanoparticles

Abstract

Layered metal hydroxide salts powder have anisotropic surface charge on the plate-like particles derived from their layered crystal structure. The aggregation structure of layered metal hydroxide in the water phase were specific such as cardhouse structure because of surface electrostatic charge distribution depend on the pH condition. We suggest the partly hetero coagulation structure using the electrostatic charge distribution on the surface of layered metal hydroxide particle as newly anisotropic composite process. In this study, Mg-based layered hydroxide salt particle, which was our developed multi-step chemical heat storage material, and sub-micron Al₂O₃ particles were used as hetero coagulation particle for the reaction packing bed on chemical heat storage system. The hetero coagulation structure of Mg-LHS and Al₂O₃ particles was generated at pH 7. It was found that hetero coagulation particles was effective to make packing bed for high reaction speed and high thermal storage density. It was assumed that packing bed of hetero coagulation powder have porous structure with high density and the pass structure of water vapor.