Abstract
The stability and the ζ-potential of positive silver iodide sols in the presence of a number of polyvinyl alcohols (PVAs), and the amount of the PVAs adsorbed on the silver iodide powder, suspended in the solution having the same composition as the medium of the sols, were measured. From the results obtained, the flocculation mechanism of positive silver iodide sols by PVA was discussed. The lowering of the sol stability by the flocculating action of PVA is observed over a wide range of the PVA concentrations. This flocculation is based on the strong binding between the hydroxyl groups of PVA and the positively charged silver iodide surface. The adsorption behavior of PVA on the positive silver iodide differs from that on the negative silver iodide.
