2018, №4

сс. 74-93

Recrystallization of Zinc Oxide in Sub- and Supercritical Aqueous Medium

2018, №4

сс. 74-93

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Yu.D. Ivakin, M.N. Danchevskaya, G.P. Muravieva

Key words: recrystallization of zinc oxide, fine crystalline zinc oxide, sub- and supercritical aqueous medium, solid phase mobility in an aqueous medium, crystal size distribution

The electron microscopy method was used to study the formation of a disperse
composition of a fine-crystalline powder during the recrystallization of zinc oxide in
an aqueous medium at 100—400 °C. It was shown that recrystallization in condensed
water is difficult, but proceeds in a medium of water in the state of steam or supercritical
fluid in the presence of an activator (ammonium chloride). At temperatures up to
300 °C, recrystallization occurs under the action of an introduced activator, and in the
range of 300—400 °C, due to the joint action of the activator and the thermal activation
of the surface layer of crystals. In the recrystallization process, monodisperse ZnO
powder with an average crystal size of 0.184 μm is converted into a polydisperse
powder with several distribution components and average sizes from 0.08 to several
microns.

doi:10.1134/S199079311907011X