Synthesis of inorganic compounds 9metal,oxide and hydroxide) in polyol medium:a versatile route related tothe sol-gel process

摘要

A new route for the preparation of powdery metla,oxide and hydroxide materials is presented as a chimie douce alternative to the sol-gel method.It consists in the reduction or the hydrolysis of a metalsalt dissolved and heated in a polyol medium. It appears through zinc and cobalt examples that the use of acetate rpecursors contrarily to chloride or sulfate ones leads to the precipitation of a solid (metla,oxide,hydroxide) whose nature depends on two main factors:the hydrolysis ratio,defined by the water to metal molar ratio,and the reaction temperature. As in the sol-gelmethod,acetate leads tothe formation of intermediate alkoxyacetae complex. The absence of water favors metal formation while its presence favors oxide or hydroxyacetate formation.