6533b82dfe1ef96bd129146a
RESEARCH PRODUCT
Nonlinear hairy layer theory of electrophoretic fingerprinting applied to consecutive layer by layer polyelectrolyte adsorption onto charged polystyrene latex particles
Edwin DonathV. N. ShilovHelmut MöhwaldDirk WaltherE. KnippelChristiane A. HelmK. LowackA. Buddesubject
ChemistryLayer by layerSurfaces and InterfacesCondensed Matter PhysicsPolyelectrolyteSurface conductivityColloidElectrophoresisAdsorptionPolyelectrolyte adsorptionChemical engineeringIonic strengthPolymer chemistryElectrochemistryGeneral Materials ScienceSpectroscopydescription
The consecutive layer-by-layer adsorption of poly(allylamine hydrochloride) (PAH) and poly(styrenesulfonate) (PSS) on colloidal charged latex particles is investigated by measuring the electrophoretic mobility as a function of pH and ionic strength over a broad range (electrophoretic fingerprinting). Meaningful interpretation of the data required the development of a nonlinear approach to hairy particle electrophoresis including dissociation, adsorption, and association. Steric and electrostatic exclusion of mobile ions from the hairy layer has been considered. Also, the surface conductivity correction is extended to the case of charged hairy layer particles. We deposited up to three polyelectrolyte layers. The following were found: (i) Each layer deposition is accompanied by charge overcompensation and (ii) Not only the top layer but also the underneath layers and the naked latex particle surface contribute to the particle mobility. This can be interpreted as an incomplete coverage or a polyelectrolyte ...
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-10-01 |