Oxidative Esterification of Aldehydes with Urea Hydrogen Peroxide Catalyzed by Aluminum Chloride Hexahydrate

2016 ◽  
Vol 37 (8) ◽  
pp. 1368-1370
Author(s):  
Sin-Ae Lee ◽  
Yoon Mi Kim ◽  
Jong Chan Lee
Keyword(s):  
Hydrogen Peroxide ◽  
Aluminum Chloride ◽  
Oxidative Esterification ◽  
Chloride Hexahydrate ◽  
Urea Hydrogen Peroxide ◽  
Aluminum Chloride Hexahydrate

scholarly journals From Clay Minerals to Al2O3 Nanoparticles: Synthesis and Colloidal Stabilization for Optoelectronic Applications

Minerals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 118 ◽  
Author(s):  
Yesica L. Botero ◽  
Jorge Eliécer López-Rendón ◽  
Daniel Ramírez ◽  
Dioni Mabel Zapata ◽  
Franklin Jaramillo
Keyword(s):  
Particle Size ◽  
Aluminum Chloride ◽  
Perovskite Solar Cells ◽  
Acid Leaching ◽  
Colloidal Dispersion ◽  
Al2o3 Nanoparticles ◽  
Chloride Hexahydrate ◽  
Optoelectronic Applications ◽  
Aluminum Chloride Hexahydrate ◽  
Clay Materials

This research was performed to obtain high-value products from clay materials. High-grade nanometric delta-alumina (δ-Al2O3) was obtained from the modification of clay-based minerals, which could be potentially applied in the form of thin film for novel optoelectronic applications. The selective recovery process of alumina from clay materials presents an important advantage regarding the complete removal of other starting constituents such as silica, iron, titanium, alkali, and alkaline earth metals. To accomplish the selective removal of different species, an acid leaching route was used to extract the aluminum, then the iron impurities were eliminated by alkaline precipitation. The solution was acidized to precipitate the aluminum as aluminum chloride hexahydrate. Finally, the aluminum chloride hexahydrate was calcinated to obtain nano-delta-alumina with purity of over 98.5% Al2O3. The dominating crystalline phase was delta–gamma alumina (δ-phase and γ-phase), with a particle size of <140 nm. Then, these nanoparticles (NPs) were prepared as a stable colloidal dispersion to form a mesoporous layer employing the spin-coating technique. Initially, the synthesized alumina was characterized by atomic force microscopy (AFM) and TEM to determine the particle size and its morphology, whereas the colloidal dispersion was analyzed by rheological measurements. Finally, the findings of this investigation made it possible to get thin films with good porosity, which can be used in optoelectronic applications, specifically in perovskite solar cells.

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