Aqueous synthesis of metal hydroxides with controllable nano/macro architectures

Abstract

This review briefly describes recent advances on the synthesis of metal hydroxide nanomaterials and their assembly into 3D architectures toward applications of catalysis, adsorption, and energy conversion. The discussion is mainly dedicated to the synthesis strategies toward nanohydroxide-based functional materials. A special attention is focused on two reaction schemes for the preparations of: (1) macroporous (hydr)oxides monoliths and (2) monodispersed hydroxide nanoclusters and mesoporous hydroxides.

A nanoLDH catalyst with high CO2 adsorption capability for photo-catalytic reduction

“…Please do not adjust margins Please do not adjust margins nature by the NaOH treatment can be explained by the relaxation of a metastable poorly-crystalline surface into a thermodynamically-stable crystalline surface. The rapid hydrolysis of metal cations induced by PO under a high degree of supersaturation reportedly introduces defective poorlycrystallize hydroxide, 21 where defective penta-coordinated Al(III) species were introduced in the case of aluminum hydroxide. The treatment with NaOH is expected to work as a ripening process to form a thermodynamically-stable surface via a dissolution-reprecipitation.…”

“…contributes to form metastable materials in some cases; defective sites which potentially work as active sites of the catalytic reaction can be introduced in nano metal hydroxides 21. Morphological features and catalytic activities of nano LDH samples were systematically compared with those of reference LDH prepared via a standard co-precipitation method.…”

Amorphous Calcium Phosphates: Solvent‐Controlled Growth and Stabilization through the Epoxide Route

“…Theoretically, decreasing precipitation temperature and/or employing alternative cosolvents, could affect the inherent phase stability (solubility) of the solid products and their (re) crystallization kinetics as well, paving the way towards the obtaining of ACP. In the current context, both strategies can be easily implemented with the epoxide route since this method offers the possibility to drive the alkalinization process by employing a variety of nucleophiles, [33] epoxides [66] and/or solvents. [47] Hence, as a first step to obtain stable ACP the effect of temperature was evaluated under a markedly lower precipitation/(re)crystallization scenario (5°C).…”