Abstract
Abstract Polymer-coated superparamagnetic iron oxide nanoparticles (SPION) in aqueous dispersion were prepared by the coassembly of SPION coated by an oleate bilayer with the double hydrophilic block polyelectrolyte poly[(3,5-bis(trimethylammoniummethyl)-4-hydroxystyrene iodide]- block -poly(ethylene oxide) (QNPHOS-PEO) and characterized by TEM and AFM. It was found that the coating by QNPHOS-PEO affects their aggregation into larger structures on the micrometer length scale observed by small-angle light scattering as well as the dynamics of the dispersion observed by dynamic light scattering. Oleate-SPION in aqueous dispersions form compact aggregates with the fractal dimension, D = 2.4, and the characteristic size about 2 μm which exhibit internal dynamics manifesting itself by the presence of the relaxation mode with τ ∼ q −3 . In the case of QNPHOS-PEO/oleate-SPION dispersions, the polyelectrolyte coating promotes the formation of compact clusters with the size of the order of ∼10 2 nm. The clusters, weakly interacting by magnetic dipolar interactions, form linear chainlike aggregates with the low fractal dimension, D = 1.2. The dynamics of the QNPHOS-PEO/oleate-SPION dispersions observed by DLS is dominated by the diffusion of the clusters.
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