Abstract
Abstract Field-flow fractionation (FFF) is a class of techniques in which a nonuniform (i.e., shear) flow is used to amplify differences in some physicochemical property (e.g., electrical mobility, sedimentation velocity, molecular or cellular diameter) by taking advantage of the fact that in a viscous flow the velocity at a motionless wall is zero, so that a species which tends to concentrate at the wall will be retarded relative to a species that is less concentrated at the wall. This class of techniques has been extensively developed since the original paper by Giddings (1). The reader is referred to recent reviews by Giddings (2, 3) for detailed discussions of the state of the art.
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