RT Journal Article
T1 Probing Nanometer-Thick Polyelectrolyte Layers Adsorbed on Oppositely Charged Particles by Dynamic Light Scattering
A1 Hierrezuelo-Osorio, José Manuel
A1 Szilagyi, Istvan
A1 Vaccaro, Andrea
A1 Borkovec, Michal
K1 Hidrodinámica
AB The thickness of adsorbed polyelectrolyte layers on oppositely charged particles can bemeasured by dynamic light scattering (DLS) with a precision of fractions of a nanometer. However, such datacan be only reliably obtained when effects of particle aggregation are carefully eliminated by working atlow particle number concentrations. In order to achieve a sufficient light scattering intensity at the same time,the size of colloidal particles must be chosen relatively large. We find that such measurements are best carriedout with latex particles in the range of diameters of 150-300 nm. The precision of the measurement can befurther enhanced with multiangle DLS. The thickness of adsorbed polyelectrolyte layers on oppositelycharged particles is normally below 10 nm. At low ionic strengths, a typical thickness is merely 1-2 nm, whileat higher ionic strengths one observes thicknesses between 6 and 9 nm. The transition between these tworegimes occurs at ionic strengths 0.01-0.05 M. These observations were made with various highly chargedcationic and anionic polyelectrolytes and can be considered as quite generic.
PB ACS
YR 2010
FD 2010-10-06
LK https://hdl.handle.net/10630/33290
UL https://hdl.handle.net/10630/33290
LA eng
NO Macromolecules 2010, 43, 21, 9108–9116
NO https://v2.sherpa.ac.uk/id/publication/7790
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 3 mar 2026