Abstract
Abstract In this paper we discuss the relationship between field-flow fractionation and split-flow thin (SPLITT) cell methodology, both of which utilize transverse driving forces to establish different transverse concentration profiles for various suspended particle populations carried by flow down a ribbonlike channel. It is shown that hydrodynamic lift forces can assume a particularly important role among the stable of forces available; when combined with certain other forces the lift forces lead to the formation of thin hyperlayers of particles distributed within the channel. The conditions necessary to split the channel flow into substreams containing different particle populations by SPLITT techniques are discussed. It is shown that the SPLITT system can be operated in either an equilibrium or a transport mode, both benefiting by the use of an inlet as well as an outlet flow splitter in the cell.
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