PREPARATION OF UNIFORM ZINC-OXIDE COLLOIDS BY CONTROLLED DOUBLE-JET PRECIPITATION

A new and simple method for the preparation of uniform zinc oxide coll oidal particles of different morphologies by controlled double-jet pre cipitation is described. Scanning electron microscopy and X-ray diffra ction data indicate that the solids generated under different conditio ns have identical crystallite structures, although they are internally composite. The growths of the subunits and of the particles themselve s follow different patterns. Particles formed in the presence of a sur factant (sodium dodecyl sulfate) exhibit essentially the same overall characteristics, but the particles are microporous.