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Download fileDependency of Particle Sizes and Colloidal Stability of Polyelectrolyte Complex Dispersions on Polyanion Structure and Preparation Mode Investigated by Dynamic Light Scattering and Atomic Force Microscopy†
journal contribution
posted on 2007-07-26, 00:00 authored by Marcela Mihai, Ecaterina Stela Dragan, Simona Schwarz, Andreas JankePolyelectrolyte complex (PEC) dispersions were prepared by controlled mixing of three random copolymers
of sodium 2-acrylamido-2-methylpropanesulfonate (AMPS) with either t-butyl acrylamide (TBA) [P(AMPS54-co-TBA46) and P(AMPS37-co-TBA63)] or methyl methacrylate (MM) [P(AMPS52-co-MM48)] with an ionene-type polycation, containing 95 mol % N,N-dimethyl-2-hydroxypropyleneammonium chloride repeat units
(PCA5), with their structural characteristics being deeply investigated by dynamic light scattering (DLS) and
atomic force microscopy (AFM). Shape, size, and polydispersity of the PEC dispersions were directly observed
by AFM as a function of polyanion structure, the ratio between charges, n-/n+, and the titrant addition rate
(TAR). The particle sizes increased and the colloidal stability decreased with the increase of the nonionic
comonomer content and with the decrease of TAR. It was demonstrated that the medium particle sizes of the
complex nanoparticles adsorbed on silicon wafers measured by AFM, in the dry state, were close but always
lower than those measured by DLS, both before and after the complex stoichiometry.
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TARcomonomer contentPolyelectrolyte Complex DispersionsParticle Sizestitrant addition ratePCAAFMDLSpolyanion structureMMTBAAMPSmethyl methacrylateparticle sizesDynamic Light ScatteringColloidal StabilityPolyanion StructurePEC dispersionsforce microscopyPreparation Mode Investigatedmedium particle sizessilicon wafers