Surface interactions during polyelectrolyte multilayer build-up. 2. The effect of ionic strength on the structure of preformed multilayers

Langmuir : the ACS Journal of Surfaces and Colloids
Eva BlombergFrank Caruso

Abstract

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 th...Continue Reading

References

Jun 7, 2005·Advances in Colloid and Interface Science·Per M ClaessonAndra Dedinaite
Jul 1, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Eva BlombergFrank Caruso
Sep 4, 1998·Angewandte Chemie·Edwin DonathHelmuth Möhwald

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Citations

Sep 11, 2014·Physical Chemistry Chemical Physics : PCCP·Samantha MicciullaRegine von Klitzing
Jun 22, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Thomas BoudouCatherine Picart
Oct 12, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Emily D CranstonMark W Rutland
Jun 2, 2011·The Journal of Physical Chemistry. B·Oznur KaftanGeorg Papastavrou

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