Abstract
The adsorption of polyacrylic acid onto an alumina surface is shown using fluorescence spectroscopy to be followed by a rearrangement of its macromolecular segments in the adsorbed state. The adsorption of pyrene-labelled polyacrylic acid has been investigated from its solutions and from solutions mixed with unlabelled acid. The excimer efficiency of the emission of the pyrene-labelled polymer species indicates a pH-independent equilibrium conformation of adsorbed polymer chains. While the slow conformational rearrangement may not affect rapid flocculation processes, it could affect slow flocculation as well as deaggregation and reaggregation processes.
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