Synthesis of manganese oxide sols by KMnO4 reduction with polyvinyl alcohol in an aqueous medium

Abstract

Manganese oxide sols were synthesized using the chemical condensation method by KMnO4 reduction with polyvinyl alcohol in an aqueous medium. The resulting gels were characterized by the manganese oxide content of 0.07–0.19 wt %, pH 9.5–10.2, and ζ-potential of–(20.3–42.9) mV. Spectrophotometric, turbidimetric, and dynamic light scattering methods were employed to determine how the particle size, ζ-potential, pH, and manganese oxide content in the resulting sols were affected by the KMnO4 concentration and the KMnO4 : polyvinyl alcohol ratio. The most stable sols preserved stability for over180 days and remained stable up to 0.5 M KCl, CaCl2, and AlCl3 concentrations.