Influence of Mixed Solvent on the Formation of Monodisperse Al2O3 Powders by Hydrolysis of Aluminum sec-Butoxide

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Abstract
To investigate the solute and solvent interaction in the formation of monodispersed Al2O3 particles by hydrolysis of aluminum sec-butoxide (ABus) in a mixed solvent of n-octanol and acetonitrile, acetonitrile and water were added separately into an n-octanol-ABus solution. At first, acetonitrile was added into n-octanol-ABus solution, and then water dissolved in solvents such as ethanol, n-octanol and acetonitrile was added. In the first step, solubility of the solution was decreased rapidly by the addition of acetonitrile and consequently a part of the dissolved alkoxide was precipitated as droplets. This emulsion was stabilized with an emulsifier, hydroxy propyl cellulose. In the next step, hydrolysis of alkoxide droplets resulted in hydroxide particles of about 200nm and at the same time, oligomers were derived from the dissolved alkoxide. Subsequently, the oligomers diffused onto the surface of particles and played an important role in the particle growth. When ethanol was used as the solvent for dissolving water, the resultant particles had an average particle size of 0.5μm and a geometrical standard deviation of 1.10.

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