Microwaves and layered double hydroxides: A smooth understanding

Abstract

Microwave-hydrothermal treatment (MWHT), a modification of conventionalhydrothermal treatment, has been used during post-treatment of different layered doublehydroxides (LDHs). In some cases, microwaves (MWs) have been used simultaneously withurea hydrolysis or for reconstruction of the LDH structure. The main advantages of replacingthe conventional furnaces by MW ovens are a noticeable reduction in the time required tocomplete the process to obtain well-crystallized materials, and modification of their particlesize distribution and textural and thermal properties. MW radiation leads to an increase inthe rate of urea hydrolysis and consequently to fast precipitation of LDHs. Finally, thememory effect of Ni,Al-based LDHs is also improved. © 2009 IUPAC.