Abstract
The radiation-chemical reduction of Co2+ ions in an aqueous solution of Co(ClO4)2 containing sodium formate was studied. Stable metal sols containing spherical particles with a diameter of 2–4 nm are formed under γ-irradiation in the presence of polyacrylate as the stabilizing additive. An aqueous solution of colloidal cobalt has an optical absorption that increrases smoothly in the UV region without a maximum to 200 nm (ɛ200=1.3·104 mol-1 L cm-1). It is established that the radiation-chemical reduction of the Co2+ ions occursvia an autocatalytic mechanism. The metal sols catalyze the reduction of the Co2+ ions by Co2 − radical ions formed under irradiation. The properties of the sols were studied, and it is shown that they are readily oxidized by hydrogen peroxide and other oxidants. The mechanism of chemical reactions involving the sols is discussed.
Published Version
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