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Silicon dioxide, titanium dioxide, aluminium dioxide, zirconium dioxide, and yttrium dioxide particles containing macropores with ordered, hexagonal closed packing structures were produced by spray pyrolysis. A mixture of a solution of the oxide source (nitrous metal) and a colloid comprised of polystyrene latex (PSL) particles was used. The process involved initial drying at low temperature to evaporate...
Composites of zinc oxide (ZnO) nanoparticles in silica matrix can be produced by initially synthesizing a ZnO colloid (containing ZnO nanoparticles in ethanol solution), mixed with tetraethoxysilane (TEOS), followed by spray drying, to produce powder comprised of submicrometer sized particles. The initial size of ZnO nanoparticles in the colloid is about 3 nm when the precursors are first mixed, but...
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