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T. Schauer

Theoretical and practical aspects of the field-flow fractionation (FFF) method

Polimery 1995, No 10, 555

DOI: dx.doi.org/10.14314/polimery.1995.555


The FFF method fractionates particles while they move in a force field, immersed in a mobile fluid flowing along a thin unfilled channel. The force field (e.g. gravitational, centrifugal, temperature gradient, electric or magnetic) is applied, normal to the direction of flow of the mobile fluid, to make the particles occupy well-defined positions in the channel. These positions determine the retention time which is directly related to the particle size.Two FFF variants are presented in detail (flowsheets, calculation of results), viz., the sedimentation (SFFF) and cross-flow fractionation (FlFFF), both particularly suitable for the measurement of the size of powdered particles. FlFFF studies on film-forming resin/pigment and film-forming resin/pigment/filler systems are presented.

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