From Clay Minerals to Al2O3 Nanoparticles: Synthesis and Colloidal Stabilization for Optoelectronic Applications
| Autor: | Franklin Jaramillo, Jorge Eliécer López-Rendón, Dioni Mabel Zapata, Yesica L. Botero, Daniel Ramirez |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
lcsh:QE351-399.2 0211 other engineering and technologies Nanoparticle chemistry.chemical_element 02 engineering and technology alumina recovery Thin film Porosity colloid 021102 mining & metallurgy lcsh:Mineralogy business.industry Geology 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology leaching chemistry mesoporous thin films Optoelectronics high-grade alumina nanoparticles Particle size Leaching (metallurgy) 0210 nano-technology business Mesoporous material Clay minerals Titanium |
| Zdroj: | Minerals, Vol 10, Iss 2, p 118 (2020) Minerals Volume 10 Issue 2 |
| Popis: | This research was performed to obtain high-value products from clay materials. High-grade nanometric delta-alumina (&delta 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&ndash gamma alumina (&delta phase and &gamma 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. |
| Databáze: | OpenAIRE |
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