Surface-Induced Rearrangement of Polyelectrolyte Complexes: Influence of Complex Composition on Adsorbed Layer Properties
2010 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 26, no 18, 14606-14614 p.Article in journal (Refereed) Published
The adsorption characteristics of two different types of polyelectrolyte complexes (PECs). prepared by mixing poly(allylamine hydrochloride) and poly(acrylic acid) in a confined impinging jet (CIJ) mixer, have been investigated with the aid of stagnation point adsorption reflectometry (SPAR), a quartz crystal microbalance with dissipation (QCM-D), and atomic force microscopy (A FM) using SiO2 surfaces The two sets of PEC were prepared by combining high molecular mass PAH/FAA (PEC-A) and low molt:cubit mass PAH/PAA (PEC-B) The PEC-A showed a higher adsorption to the SiO2 surfaces than the PEC-B The adsorption of the PEC-A also showed a larger change in the dissipation (AD), according to the QCM-D measurements, suggesting that the adsorbed layer of these complexes had a relatively lower viscosity and a lower shear modulus Complementary investigations of the adsorbed layer using A FM imaging showed that the adsorbed layer of PEC-A was significantly different from that of PEC-B and that the changes in properties with adsorption time were very different for the two types of PECs The PEC-A complexes showed a coalescence into larger block of complexes on the SiO2 surface, but this was not detected with the PEC-B The size determinations of the complexes in solution showed that they were very stable over time, and it was therefore concluded that the coalescence of the complexes was induced I the interaction between the complexes and the surface The results also indicated that polyelectrolytes can migrate between the different complexes adsorbed to the surface The results also give indications that the preparation of PEC-B leads to the formation of two different types of polyelectrolyte complexes differing in the amount of polymer in the complexes: i.e., two populations of complexes were formed with similar sizes but with totally different adsorption structures at the solid-liquid interface.
Place, publisher, year, edition, pages
2010. Vol. 26, no 18, 14606-14614 p.
Adsorbed layers, Adsorption characteristic, Adsorption structures, Adsorption time, AFM imaging, Complex compositions, High molecular mass, Impinging jet, Low molecular mass, Poly(acrylic acid ), Poly(allylamine hydrochloride), Polyelectrolyte complexes, Quartz crystal microbalance with dissipation, Shear modulus, Solid-liquid interfaces, Stagnation point adsorption reflectometry, Adsorption, Atomic force microscopy, Carboxylic acids, Coalescence, Hydrogels, Medical problems, Molecular mass, Organic acids, Phase interfaces, Polyelectrolytes, Polyethylenes, Quartz, Quartz crystal microbalances, Silicon compounds
IdentifiersURN: urn:nbn:se:kth:diva-26678DOI: 10.1021/la.1022054ISI: 000281690600035ScopusID: 2-s2.0-77956576994OAI: oai:DiVA.org:kth-26678DiVA: diva2:373335
QC 201011302010-11-302010-11-262012-05-08Bibliographically approved