Charging and Aggregation of Positively Charged Colloidal Latex Particles in Presence of Multivalent Polycarboxylate Anions
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Amin Sadeghpour
Abstract
Colloidal stability and charging behavior of amidine latex particles in the presence of multivalent oligomers of acrylic acid was investigated by electrophoresis and light scattering. The data were interpreted quantitatively with the theory of Derjaguin, Landau, Verwey and Overbeek (DLVO) whereby the surface potentials were estimated from electrophoresis. Monomer leads to slow aggregation at low concentrations and to rapid aggregation at high concentrations, as characteristic for simple salts. The oligomers induce a charge reversal of the particles. Close to the isoelectric point (IEP) aggregation is rapid while the suspension becomes stable away from this point. At high oligomer concentrations, the aggregation becomes rapid again. The agreement between DLVO theory and experiment is good close to the IEP. At higher oligomer concentrations, the theory predicts larger stabilities than observed experimentally. While inter-particle forces seem to be well described by DLVO theory near the IEP, additional attractive non-DLVO forces are becoming relevant at higher concentrations.
© by Oldenbourg Wissenschaftsverlag, München, Germany
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Articles in the same Issue
- Preface — An energetic life between soft matter and hard X-rays
- Optimizing the Sensitivity of FT-Rheology to Quantify and Differentiate for the First Time the Nonlinear Mechanical Response of Dispersed Beer Foams of Light and Dark Beer
- Adsorption of Spherical Polyelectrolyte Brushes: from Interactions to Surface Patterning
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- Charging and Aggregation of Positively Charged Colloidal Latex Particles in Presence of Multivalent Polycarboxylate Anions
- Spherical Polyelectrolyte Brushes on Colloidal Poly(butadiene) Particles
- Repulsive Forces between Spherical Polyelectrolyte Brushes in Salt-Free Solution
- Structure-Property Relations of Liquid Crystalline Gels with ABA-Triblock Copolymers as Gelators
- Direct-Imaging Cryo-SEM of Nanostructure Evolution in Didodecyldimethylammonium Bromide-Based Microemulsions
- Solubilisation of Oils of Different Polarity in Aqueous Solutions of Pluronic Triblock Copolymers
- Double Responsive Hydrogels based on Tertiary Amine Methacrylate Star Block Copolymers
- Coarse-Graining of Ionic Microgels: Theory and Experiment
- Non NIPAM Based Smart Microgels: Systematic Variation of the Volume Phase Transition Temperature by Copolymerization
- Temperature Controlled Activity of Lipase B from Candida Antarctica after Immobilization within p-NIPAM Microgel Particles
- Synthesis of PEG-Stabilized Fluoro-Acrylate Particles and Study of their Glass Transition in Aqueous Dispersion
- Probability Densities of a Forced Probe Particle in Glass: Results from Mode Coupling Theory and Simulations of Active Microrheology
- Molecular Order and Dynamics of Tris(2-ethylhexyl)phosphate Confined in Uni-Directional Nanopores
- The Structure of Fluids with Impurities
- Packing of Cylindrical Keggin-Type Polyoxometalate Hybrid Micelles as a Function of Aspect Ratio
- Au-TiO2 Yolk-Shell Particles for Photocatalysis Application
- Formfactors of Hollow and Massive Rectangular Parallelepipeds at Variable Degree of Anisometry
