Effect of polyelectrolyte charge density on the adsorption and desorption behavior on mica
2002 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 18, no 5, 1604-1612 p.Article in journal (Refereed) Published
The XPS (ESCA) method was employed to quantitatively determine polyelectrolyte adsorption on the mica basal plane from low ionic strength solutions. Particular emphasis was given to the effect of the polyelectrolyte charge density. By combining the results obtained from XPS and surface force measurements it was possible to analyze the cation exchange at the surface that occurs as a result of polyelectrolyte adsorption. AFM-imaging was used to obtain information on the structure of the adsorbed layer when the polyelectrolyte coverage was low. Further, the desorption of preadsorbed polyelectrolyte layers by addition of inorganic salt and by addition of an anionic surfactant was investigated by XPS and some complementary surface force measurements. The results demonstrate that the lower the polyelectrolyte charge density is, the easier it is to remove the polyelectrolyte from the surface. The surfactant, which by itself does not adsorb to the mica surface, is more efficient in this respect than the inorganic salt. This observation can be rationalized by considering that the surfactant and polyelectrolyte form complexes with each other. Thus, the surfactant brings negative charges into the adsorbed layer that reduces the affinity to the surface. However, high-charge-density polyelectrolytes are removed to a very limited degree even when the surfactant concentration is above the critical micellar concentration, which is explainable by the poor solubility of the polyelectrolyte-surfactant complexes formed.
Place, publisher, year, edition, pages
2002. Vol. 18, no 5, 1604-1612 p.
single polyethylenimine polymers, quartz-crystal microbalance, chemical force microscopy, cationic polyelectrolyte, surface forces, layers, polyacrylamide, electrolytes, polystyrene, cellulose
IdentifiersURN: urn:nbn:se:kth:diva-21351DOI: 10.1021/la0155698ISI: 000174130500024OAI: oai:DiVA.org:kth-21351DiVA: diva2:340049
QC 201005252010-08-102010-08-10Bibliographically approved