Binding of Sodium DodecyI Sulfate to Polyethylene Oxide at the Silica-Water Interface
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چکیده
The effect of prC'adsorbed sx>lethylene oxide ( PEO) on silica on the subsequent adsorptioo of sodium dodec)1 sulfate (50s) on the silica was investipted in this study. Even though SDS does not normally adsorb on the similarly charged silica, it is shown that anionic 50s can be made to adsorb on it in the presence of preadsorbed PEO. The role of polymer molecular weight and the mode of addition of 50s ~re also investipted. The amount of 50s bound to PEO prQdsorbed on silica was not affected by the polymer molecular weight. Interestingly, adsorJltioo of 50s determined from its mixtures with PEO in solution is lower than that found on preadsorbed PEO on silica. It is also shown that interactions between rEO and 50s at the silica-water interface are stronger than the interactions between them in bulk solution. c 1991 ~ PI-. Inc.
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