Water-soluble amorphous alumina-based ceramic precursors and alumosols: Structural and chemical characterization |
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| Authors: | Paul F McMillan Jason R Diefenbacher William T Petuskey Richard W Goettler |
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| Institution: | 1. Department of Chemistry and Materials Chemistry Centre, Christopher Ingold Laboratory, University College London, 20 Gordon St., London WC1H 0AJ, UK;2. Freescale Semiconductor, 2100 Elliot Road, MD EL 310, Tempe, AZ 85284, USA;3. Department of Chemistry and Biochemistry and School of Materials, Arizona State University, Tempe, AZ 85287-1604, USA;4. Rolls-Royce Fuel Cell Systems (US) Inc., 6065 Strip Avenue NW, Canton OH 44720, USA |
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| Abstract: | We examined the solid-state water-soluble amorphous precursors that are formed by partial thermal decomposition of Al(NO3)3·9H2O (aluminum nitrate nonahydrate: ANN) using Raman and FTIR and solid-state magic-angle spinning NMR spectroscopy. We also studied the species formed in the aqueous alumosols formed by dissolution of the pre-ceramic precursors using 27Al NMR spectroscopy. Species identified in the alumosols included the Al3+(H2O)6 monomer, the AlO4Al12(OH)24(H2O)12]7+(Al13) Keggin ion, and the Al30 polycation, Al30O8(OH)56(H2O)24]18+, as well as various other oligomers or nanoparticles containing IV-, V- and VI-coordinated Al3+ ions. |
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