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Scientific article
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Structure of an Adsorbed Polyelectrolyte Monolayer on Oppositely Charged Colloidal Particles

Published inLangmuir, vol. 25, no. 9, p. 4864-4867
Publication date2009
Abstract

An adsorbed layer of a cationic polyelectrolyte, poly(diallyldimethyl-ammonium) chloride (PDADMAC) on negatively charged colloidal latex particles was investigated by small-angle neutron scattering (SANS) and dynamic light scattering (DLS). SANS gives a layer thickness of 8 ± 1 Å and a polymer volume fraction of 0.31 ± 0.05 within the film. DLS gives a somewhat larger thickness of 18 ± 2 Å, and the discrepancy is likely due to the inhomogeneous nature of the layer and the existence of polymer tails or loops protruding into solution. These results show that a highly charged polyelectrolyte adsorbs on an oppositely charged colloidal particle in a flat configuration due to the attractive forces acting between the polyelectrolyte and the substrate.

Citation (ISO format)
VACCARO, Andréa et al. Structure of an Adsorbed Polyelectrolyte Monolayer on Oppositely Charged Colloidal Particles. In: Langmuir, 2009, vol. 25, n° 9, p. 4864–4867. doi: 10.1021/la9007608
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ISSN of the journal0743-7463
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