A sol–gel synthesis to prepare size and shape-controlled mesoporous nanostructures of binary (II–VI) metal oxides

Abstract

A base-catalyzed sol–gel approach combined with a solvent-driven self-assembly process at low temperature is augmented to make highly mesoporous metal oxide nanostructures of manganese and copper, and hydroxide nanostructures of magnesium.

Synthesis of ZnO-CuO and ZnO-Co3O4 Materials with Three-Dimensionally Ordered Macroporous Structure and Its H2S Removal Performance at Low-Temperature

“…Compared with 3DOM-Zn, the addition of copper oxide or cobalt oxide could increase the BET specific surface area. Since the formation and growth of CuO/Co3O4 grains are different from those of ZnO under the same condition, inconsistent shrinkage occurred during the calcination process [39,40]. The shrinkage led to the formation of micropores, which was consistent with the results of insert images in Figure 4 [27], and the increase in the number of micropores increased the specific surface area.…”

Solvatochromism of Cupric Chloride and Its Conversion to Copper Oxide

“…The formation of CuO from the reaction in water may proceed through the so-called sol–gel process. − In such a reaction, molecules are first converted into colloids (or sol ) which act as precursors to form integrated networks (or gel ) of either discrete particles or a network of coordinated ions, leading to the eventual formation of solids. Sol–gel processes typically refer to the hydrolysis of metal alkoxides or silicon alkoxides such as Ti­(O- n -Bu) 4 or Si­(OEt) 4 , forming TiO 2 or SiO 2 . , Such reactions have been used to make unique porous materials with different applications. ,,− Our speculation of the sol–gel process in the formation of CuO in the reaction of CuCl 2 ·2H 2 O with NaOH is based in part on our observation of the reaction shown in Table S1. Henry and co-workers have synthesized Cu­(II) hydroxide gels from the reaction of Cu­(acetate) 2 with NH 3 in the presence of a small amount of K 2 SO 4 .…”

“…Powder X-ray diffraction (PXRD) of powdered xerogels, which are formed from drying after water refluxing, also shows the presence of CuO . Similar processes have been used to make CuO or mixed metal oxides containing CuO. − If indeed the sol–gel process occurs in the current reaction of CuCl 2 ·2H 2 O with NaOH, it may go through the steps in Figure .…”

Advanced metal oxide-based nanocatalysts for the oxidative synthesis of fine chemicals

“…Proceeding on this track, a base catalyzed solgel methodology accompanied with solvent-driven self-assembly process was employed for fabricating Mn 3 O 4 and CuO nanoparticles. 41 The employed synthesis route facilely generated hexagonal, ribbon or irregular shaped Mn 3 O 4 nanoparticles having an average diameter of 100-200 nm using different solvent systems such as water, water/ethanol and water/toluene. On the contrary, the same sol-gel process produced nanoporous thin sheets, nanoparticles, rods and ribbon shaped CuO nanostructures in varied solvent media.…”