Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 413, Issue -, Pages 65-70Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2012.02.003
Keywords
Thermal field-flow fractionation; Hofmeister series; Specific ion effects; Thermophoresis; Soret coefficient
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In this study, the retention of colloidal polystyrene beads in aqueous dispersion in thermal field-flow fractionation (ThFFF) is investigated as function of various types and concentrations of electrolytes in the carrier liquid. A specific ion effect is observed and can be interpreted in terms of Hofmeister series. Addition of salt composed of chaotropic anions to the carrier liquid increases particle retention with increasing ionic strength up to several mM. This effect is less pronounced the more kosmotropic the anions are, up to a decrease of retention by increasing concentration of sulphate and citrate. It is demonstrated that the effect of varying cations is minor as compared to the one of anions with this model system. (C) 2012 Elsevier B.V. All rights reserved.
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