Study of the recovery of colloidal particles in potential barrier sedimentation field-flow fractionation

The recovery of particles of the colloidal components subject to separation by the potential barrier sedimentation field-flow fractionation (PBSdFFF) is of great significance in separation science. For the recovery studies in PBSdFFF, monodisperse submicron spherical particles of poly(methyl methacr ylate) (PMMA) were used. The extent of the PMMA particles' adhesion and det achment on and from the Hastelloy C channel wall depends on the ionic stren gth of the suspending medium. The presence of the indifferent electrolyte o f Ba(NO3)(2) in the suspending medium, which influences the total potential energy of interaction between the PMMA particles and the channel wall, lea ds to the partial or total adhesion of the PMMA particles on the channel wa ll. Finally, the ideal experimental conditions for improving the recovery o f the colloidal particles under study in PBSdFFF were investigated.