Concentration and characterization of dilute colloidal samples by potential-barrier field-flow fractionation
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Potential-barrier field-flow fractionation, which is a combination of potential-barrier chromatography and sedimentation field-flow fractionation, is shown to be a convenient and accurate method for the concentration and analysis (separation and characterization) ofdilute colloidal samples. Two sizes (0.158 and 0.271 μm) of haematite (α-Fe2O3) monodisperse colloidal samples diluted in volumes of up to 20 cm3 are used as model colloids. The particle diameters found by the present concentration procedure under various experimental conditions are in good agreement with those determined by conventional sedimentation field-flow fractionation, in which a small concentrated sample volume was injected directly into the column.
Key WordsOne-phase chromatography Field-flow fractionation (FFF) Potential-barrier FFF Colloidal materials
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