“Blue silver”: transformation of clusters and metal coagulation
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The formation and transformations of “blue silver” (λmax ≳ 700 nm) during γ-irradiation of a weakly alkaline (pH 9) aqueous solution containing AgClO4, polyacrylic acid (PAA), and isopropanol were studied. We believe that “blue silver” is a linear silver cluster stabilized on a polymeric molecule. During radiation-chemical reduction the cluster is transformed into new clusters (λmax = 365 and 460 nm). When all of the Ag+ ions present in the solution have been reduced, clusters coalesce and a new phase,i.e., colloidal silver particles, forms. The mechanism of the radiation-chemical transformations is discussed.
Key words“blue silver”, clusters sols, coagulation γ-irradiation, radiation-chemical transformations reduction, mechanism
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