ABSTRACT
This chapter deals with individual Field-Flow Fractionation (FFF) techniques differing in the character of the field used. Any effective field interacting with a macromolecular or particulate solute can be employed in FFF, each giving rise to a new FFF technique, which itself represents a determined domain of both theoretical and experimental problems and advantages as well as possibilities of various applications. The effective field can produce external forces from the outside of the separation channel, or it can produce internal forces from the inside of the separation channel. Finally, a combination of external and internally generated field forces can be employed in FFF. The action of a single external or internally generated field force is utilized in the classical FFF methods. In the steric FFF technique, any one of the force fields can be used, provided that its intensity reaches a high value and the steric exclusion mechanism predominates.
