SDS与PVP对碘化银溶胶稳定性的影响

The Effect of SDS and PVP on the Stability of Agl Sols

研究了SDS、PVP及二者的混合物对AgI溶胶稳定性的影响。SDS主要通过表面活性负离子在AgI质点表面上的吸附使ζ电势升高,提高溶胶的稳定性。低浓度的PVP使AgI溶胶敏化,高浓度时又通过吸附层的空间稳定效应使其稳定。在PVP与SDS的混合溶液中,AgI溶胶的稳定性显著增加。根据PVP与SDS在固液界面上的相互作用讨论了这一增效作用。

The stability of Agl sols in SDS, PVP and their mixed solutions has been studied. The addition of SDS increases the stability of Agl sols mainly by the increase of zeta potential of Agl particles due to the adsorption of surface active anions on particle surface. The Agl sols are sensitized at low PVP concentration, and become stable through the steric stabilization of the adsorbed layer at high PVP concentration. In the mixed solutions of PVP and SDS, the stability of Agl sols is enhanced markedly. This synergistic effect of PVP and SDS on the stability of Agl sols was discussed in terms of the interaction between polymer and surfactant at solid/liquid interface.