Stabilization and controlled association of inorganic nanoparticles using block copolymersK. Yokota1, M. Morvan1, J.-F. Berret1 and J. Oberdisse2
1 Complex Fluids Laboratory, UMR CNRS - Rhodia no. 166 Cranbury Research Center Rhodia, 259 Prospect Plains Road Cranbury NJ 08512, USA
2 Groupe de Dynamique des Phases Condensées, UMR CNRS Université de Montpellier II no. 5581 - F-34095 Montpellier, France
received 7 June 2004; accepted in final form 12 November 2004
published online 22 December 2004
We report on the structural properties of mixed aggregates made from rare-earth inorganic nanoparticles (radius 20 ) and polyelectrolyte-neutral block copolymers in aqueous solutions. Using scattering experiments and Monte Carlo simulations, we show that these mixed aggregates have a hierarchical core-shell microstructure. The core is made of densely packed nanoparticles and it is surrounded by a corona of neutral chains. This microstructure results from a process of controlled association and confers to the hybrid aggregates a remarkable colloidal stability.
82.70.-y - Disperse systems; complex fluids.
81.07.-b - Nanoscale materials and structures: fabrication and characterization.
61.10.-i - X-ray diffraction and scattering.
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