Influence of polyvinylpyrrolidone (PVP) on alumina sols prepared by a modified Yoldas procedure

Abstract

Al₁₃ polycations containing alumina sols, prepared by a modified Yoldas procedure were mixed with polyvinylpyrrolidone (PVP). Although Al speciation in freshly prepared sols was not affected by PVP addition the decay rate of Al₁₃ polycations was slightly decreased in PVP-containing sols. PVP does not show any influence on particle size and particle growth. The influence of PVP addition on viscosity and flow behavior of modified Yoldas sols depends on their solids content and \[ {\text{NO}}_{3}^{ - } / {\text{Al}} \] molar ratio.