1992 Volume 65 Issue 3 Pages 142-148
The addition of poly (styrene sulfonate) (PSS) to flocculated sodium dodecyl sulfate (SDS) adsorbed alumina enabled the alumina to redisperse due to the adsorption of PSS on the alumina, where the replacement of SDS by PSS occurred to some extent. The dispersion behavior of such a system was well correlated with the change of zeta potential of alumina. The fluorescence spectra of pyrene and pyrene-3-carboxaldehyde indicated that the micropolarity at inner region in the SDS-PSS adsorbed layer was lower than that in the PSS-adsorbed layer, while that at the external region for both the layers it was almost the same. The ESR spectra of 2, 2, 6, 6-tetramethylpiperidinyl-1-oxy suggested that the microviscosity in the SDS-PSS-adsorbed layer was greater than that in the PSS-adsorbed layer.
