Synthesis of PEG-Stabilized Fluoro-Acrylate Particles and Study of their Glass Transition in Aqueous Dispersion
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Malte Wiemann
Abstract
Synthesis of colloidal particles which are sterically stabilized in water and at the same time isorefractive in aqueous dispersion has been achieved by copolymerizing a fluoracrylate monomer with a PEG-macromonomer. Colloidal stability against salt addition and freeze-thawing cycles is demonstrated, indicating that the particles consist of a core of fluoroacrylate and a stabilizing surface layer of grafted PEG. To test the performance as a model system for studies of colloidal vitrification in aqueous media, the dynamics of a binary mixture of these particles with a size ratio of 0.8 and a number ratio of 1.3 (small : large particles) were studied in an isorefractive mixture of water and DMSO (≈ 11 mol % DMSO). The characteristic features of a system close to the glass transition were observed in the density density autocorrelation function f(q, τ) as measured by DLS. However, the glass transition occurred at an unexpectedly low volume fraction of 0.262. This discrepancy correlates with an unusually large difference between TEM and DLS radii and is explained by the presence of a rather extended hairy PEG surface layer.
© 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
- Complexation of charged colloids with polyelectrolyte stars
- 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
