Abstract
The theory for the asymmetrical flow field-flow fractionation channel was evaluated experimentally. The assumption of a constant crossflow along the channel was satisfactory. The zone-broadening theory was extended to take into a account the longitudinal diffusion and the width of the starting sample zone. In the present apparatus the longitudinal diffusion was negligible but may have to be considered for lower outlet flow rates. The axial flow velocity gradient has the advantage that the contribution by the width of the starting sample zone to the final zone width decreases
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