Abstract
Poly(ethylene oxide) (PEO) adsorbed on small silica (ludox) particles was studied by means of dynamic light scattering, as a function of segmental binding strength (pH). The results show that the hydrodynamic layer thickness δ h is constant or increases slightly with pH up to pH ~ 10.5 and then drops sharply to zero. The adsorbed amount drops much more gradually between pH 8 and 11. All data agree with most earlier measurements on different substrates, and agree with the theoretical result that the segmental adsorption energy has no effect on δh until very close to full desorption. The very different results obtained earlier for adsorption on PS latex are therefore explained as due to the heterogeneous structure of the latex surface. Finally, since the silica particles are small, special effects are expected for sufficiently high molecular weights. Some of our results are indicative of such small particle effects.
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