Revisiting Polymer–Particle Interaction in PEO Solutions

Abstract

We have measured the electrophoretic mobility and diffusion coefficient of carboxylate-modified and sulfate-modified polystyrene latex particles in poly(ethylene oxide) aqueous solutions. Carboxylate -modified polystyrene particles have shown a bound polymeric layer as the surface net charge vanishes even at very low poly(ethylene oxide) concentration. The polymeric layer causes a lower electrophoretic mobility and slower Brownian diffusion than that corresponding to the bare particles. We show that the diffusion is the result of a significantly increased effective particle size 2 r h eff = 30 nm. This bound layer is not present in sulfate-modified polystyrene latex particles. The interaction between the carboxylate-modified particle surface and the macromolecules has been confirmed by means of atomistic computer simulations. The grafted acrylate copolymers, which come from the preparation procedure of the latex particles, confer more hydrophobic surface ready to interact with the polymer. The simulations suggest that the interaction is modulated not only by the nature of the acrylic acid monomer but also by the length of the grafted copolymer. Our results have important implications for particle selection in microrheology experiments.

Orientational Dynamics of Magnetic Iron Oxide Nanoparticles in a Hydrogel: Observation by Magnetic Linear Dichroism under Oscillating Field

“…The negative zeta potential supports this consideration. Espasa-Valdepeñas et al . showed that PEO adsorbed carboxylate-modified nanoparticles in an aqueous solution.…”

“…The negative zeta potential supports this consideration. Espasa-Valdepenãs et al 44 showed that PEO adsorbed carboxylate-modified nanoparticles in an aqueous solution. Because the main chain of HEUR molecules is PEO, it is consistent that the HEUR molecule binds to MION2.…”

Scaling Perspective on Dynamics of Nanoparticles in Polymers: Length- and Time-Scale Dependent Nanoparticle–Polymer Coupling

“…(1) polyhedral oligomeric silsesquioxanes (POSS) nanoparticles with the diameter d on the order of 1 to 3 nm, 27,40,46 (2) quantum dots (QDs) with 2 nm < d < 10 nm, 36,67 (3) gold nanoparticles with 5 nm < d < 400 nm, 11,12,14,19,34,39,43,49,50,55,56,63,78 (4) magnetic nanoparticles with 5 nm < d < 20 nm, 18,31,37,38,51,52,62,64,70,71,76,80 (5) silica (SiO 2 ) nanoparticles with 5 nm < d < 50 nm, 26,29,30,44,48,57,60,61,74,81 (6) polystyrene nanoparticles with 20 nm < d < 2000 nm, 13,16,17,22,33,35,53,65,66,68,69,72 (7) nanorods with dimensions from (1) nm to (100) nm made of Au, magnetic elements and their dioxides, or titanium dioxide (TiO 2 ). 15,…”

“…The development of nanoparticle chemistry in recent years has enabled the synthesis of nanoparticles with well-controlled size, shape, and surface chemistry, yielding a library of nanoparticles available for investigating fundamental scientific problems and exploring nanoparticle-based applications. Nanoparticles commonly used in the studies of nanoparticle dynamics in a polymer matrix − include polyhedral oligomeric silsesquioxanes (POSS) nanoparticles with the diameter d on the order of 1 to 3 nm, ,, quantum dots (QDs) with 2 nm < d < 10 nm, , gold nanoparticles with 5 nm < d < 400 nm, ,,,,,,,,,,,, magnetic nanoparticles with 5 nm < d < 20 nm, ,…”

Electro-optical Study of the Anomalous Rotational Diffusion in Polymer Solutions

“…On the other hand, not only the geometry but also the affinity of the polymer for the particle surface can influence the particle velocity. Accordingly, sticky and nonsticky pictures have been explored by simulation, scaling theory, and experiments on Brownian motion. ,,− …”