Synthesis of α-Alumina Nano-Onions by Thermal Decomposition of Aluminum Formate

A simplified route to prepare α-Al2O3 nano-onions and alumina powders with an excellent surface area through the thermal decomposition of aluminum formate (Al(O2CH)3) precursor is proposed. The calcined powders were characterized by infrared and 13C MAS NMR spectroscopy. Coordination numbers and chemical interactions were determined by 27Al MAS NMR spectroscopy. The 27Al MAS NMR spectra showed the presence of η-Al2O3 at 1000°C, and the transformation to α-Al2O3 at 1100°C. The spectral data also showed that while the precursor contained 6-coordinated aluminum ions, four-, five-, and six-coordinated aluminum species were present after calcination at 400°C. SEM images and BET measurements of α-Al2O3 revealed aggregated particles with a specific surface area of 118 m2/g. A nano-onion structure of α-Al2O3 was evident from the HRTEM image.

[1]  Aaas News,et al.  Book Reviews , 1893, Buffalo Medical and Surgical Journal.

[2]  R. Sarpong,et al.  Bio-inspired synthesis of xishacorenes A, B, and C, and a new congener from fuscol† †Electronic supplementary information (ESI) available. See DOI: 10.1039/c9sc02572c , 2019, Chemical science.

[3]  N. M. Mohamed,et al.  Effect of Gas Flowrate on Nucleation Mechanism of MWCNTs for a Compound Catalyst , 2017 .

[4]  S. Y. Reyes-López,et al.  Comparative Study of Ag Nanostructures , 2016 .

[5]  Lili Ren,et al.  Synthesis of Monolithic Fe2O3-Al2O3 Composite Aerogels via Organic Solvent Sublimation Drying , 2016 .

[6]  S. Vlassov,et al.  Mechanical and structural characterizations of gamma- and alpha-alumina nanofibers , 2015 .

[7]  S. K. Tripathi,et al.  Phase dependent thermal and spectroscopic responses of Al2O3 nanostructures with different morphogenesis. , 2015, Nanoscale.

[8]  K. Ostrikov,et al.  Hierarchical bi-dimensional alumina/palladium nanowire nano-architectures for hydrogen detection, storage and controlled release , 2015 .

[9]  L. Kovalenko,et al.  α-Al2O3 powders from amorphous alumina gel , 2015, Inorganic Materials.

[10]  S. Akkurt,et al.  Sintering and microstructural investigation of gamma–alpha alumina powders , 2014 .

[11]  Hongchang Yao,et al.  Alumina nanofibers obtained via electrospinning of pseudo-boehmite sol/PVP solution , 2014, Journal of Sol-Gel Science and Technology.

[12]  Leilei Xu,et al.  Facile synthesis of nano-crystalline alpha-alumina at low temperature via an absolute ethanol sol–gel strategy , 2012 .

[13]  Zesheng Li,et al.  Theoretical study on (Al2O3)n (n = 1-10 and 30) fullerenes and H2 adsorption properties. , 2008, Inorganic chemistry.

[14]  L. O’Dell,et al.  A 27Al MAS NMR study of a sol–gel produced alumina: Identification of the NMR parameters of the θ-Al2O3 transition alumina phase , 2007 .

[15]  Karl K. Sabelfeld,et al.  Formation of charged aggregates of Al2O3 nanoparticles by combustion of aluminum droplets in air , 2004 .

[16]  Kevin Barraclough,et al.  I and i , 2001, BMJ : British Medical Journal.

[17]  W. Hager,et al.  and s , 2019, Shallow Water Hydraulics.

[18]  B. Jongsomjit,et al.  Effect of Calcination Temperatures and Mo Modification on Nanocrystalline (ź-ź)-Al2O3 Catalysts for Catalytic Ethanol Dehydration , 2017 .

[19]  Zhang Xiang,et al.  Low temperature synthesis of nano alpha-alumina powder by two-step hydrolysis , 2016 .

[20]  S. Y. Reyes-López,et al.  Thermal degradation of aluminum formate sol-gel; synthesis of α-alumina and characterization by 1H, 13C and 27Al MAS NMR and XRD spectroscopy , 2016 .

[21]  Zhiping Luo,et al.  Microstructure and mechanical properties of multiphase strengthened Al/Si/Al 2 O 3 /SiO 2 /MWCNTs nanocomposites sintered by in situ vacuum hot pressing , 2015 .

[22]  Zhijiang Wang,et al.  Preparation and characterization of highly flexible Al 2 O 3 /Al/Al 2 O 3 hybrid composite , 2015 .

[23]  W. Marsden.  I and J , 2012 .

[24]  P. Šajgalík,et al.  Two‐Stage Sintering of Alumina with Submicrometer Grain Size , 2007 .

[25]  Jiangong Li,et al.  Densification and Grain Growth of Al2O3 Nanoceramics During Pressureless Sintering , 2006 .