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.