Abstract
The observation of a repetitive series of peaks while analyzing two different samples of poly(methyl methacrylate) colloidal latex spheres by sedimentation field-flow fractionation strongly suggests that part of the latex population has aggregated into doublets, triplets, and higher-order particle clusters. The aggregation hypothesis is confirmed for the two samples both by retention calculations and by electron microscopy. It is shown that the resolution of the latex clusters is influenced by flow velocity in a manner predicted by theory but that such resolution is limited by the polydispersities of the two latex samples. Polydispersity values are obtained using plate height versus flow velocity measurements and are shown to be consistent with the different resolution levels observed for the two colloids. A detailed analysis of the results shown that steric effects play an increasing role as cluster size increases. The steric role in this study is examined at some length.
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