Synthesis of hydrosols of oxygen-containing cobalt compounds

摘要

A procedure is developed for the synthesis of hydrosols of oxygen-containing cobalt compounds. The hydrosols are stable to aggregation for several weeks in the absence of additional stabilizers. It is estab- lished that the synthesized hydrosols contain crystalline particles formed from a mixture of CoO(OH) and Co _3O _4. According to transmission electron microscopy data, the most probable diameter of the particles is about 30 nm. The hydrosols are stable to aggregation at pH 6.2-8.0. In this pH range, the particles are posi- tively charged and the values of their electrokinetic potential are no higher than 10 mV.