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Surface interactions during polyelectrolyte multilayer build-up. 2. The effect of ionic strength on the structure of preformed multilayers
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface Chemistry.ORCID iD: 0000-0001-7496-1101
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface Chemistry.
Centre for Nanoscience and Nanotechnology, Department of Chemical and Biomolecular Engineering, University of Melbourne, Victoria, Australia.
2006 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 22, no 9, 4153-4157 p.Article in journal (Refereed) Published
Abstract [en]

Interactions between surfaces bearing multilayer films of poly(allylamine hydrochloride) (PAH) and poly(styrenesulfonate sodium salt) (PSS) were investigated across a range of aqueous KBr solutions. Three layer films (PAH/PSS/PAH) were preassembled on mica surfaces, and the resulting interactions were measured with the interferometric surface force apparatus (SFA). Increasing the ionic strength of the medium resulted in a progressive swelling of the multilayer films. Interactions in solutions containing more than 10(-3) M KBr were dominated by a long-ranged steric repulsion originating from compression of polyelectrolyte segments extending into solution. In 10(-1) M KBr, repeated measurements at the same contact position showed a considerable reduction of the range and the strength of the steric force, indicating a flattening of the film during initial approach. Furthermore, this flattening was irreversible on the time scale of the experiments, and measurements performed up to 72 h after the initial compression showed no signs of relaxation. These studies aid in understanding the dominant interactions between polyelectrolyte multilayers, including polyelectrolyte films deposited on colloidal particles, which is important for the preparation of colloidally stable nanoengineered particles.

Place, publisher, year, edition, pages
2006. Vol. 22, no 9, 4153-4157 p.
Keyword [en]
polyelectrolyte multilayer, mica surfaces, electrolyte-solutions, forces, adsorption, PAH, PSS
National Category
Physical Chemistry
URN: urn:nbn:se:kth:diva-15629DOI: 10.1021/la052946yISI: 000236989300030ScopusID: 2-s2.0-33646388001OAI: diva2:333671
QC 20100525 QC 20120321Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2012-03-21Bibliographically approved

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