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A new-shaped cross-section of a channel with modulated permeability used in Sedimentation-Flotation Focusing Field-Flow Fractionation is proposed. The shape of the resulting velocity profile inside the channel is described as a function of the geometric channel characteristics. Basic separation parameters such as retention, efficiency and the related resolution are discussed. The principle of a channel with modulated permeability can also be applied to other subtechniques of Field-Flow Fractionation.
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Janča et al. (1983) studied this question.
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