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1 Materials Science Poland

1 2007

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Synthesis and characterization of alumina nanopowders by combustion of nitrate-amino acid gels

Edrissi M., Norouzbeigi R.

Materials Science Poland

2007

Vol. 25, No. 4

1029--1040

Nanocrystalline alumina powders were synthesized by the combustion method using serine and asparagine as fuels. A screening design was conducted to determine how key process factors influence preparation of nanocrystalline powders. The screening design was utilized to rank effective factors on crystalline size of alumina powders. The product was characterized by XRD, BET, and SEM. Nanocrystalline ?-alumina powders with crystal sizes between 3.95 nm and 6.71 nm and ?-alumina powders with crystallite sizes between 22.73 nm and 33.92 nm have been obtained by the combustion synthesis. The specific surface areas of samples ranged between 22 m2/g and 75 m2/g. Particle size distributions were determined by LLS and the average particle sizes of ?-alumina powders after sonication were 37.42 nm and 79.32 nm. Results of statistical analysis illustrate that the fuel to oxidizer ratio is the most effective factor to decrease the average crystal size.