Journal
ACS NANO
Volume 2, Issue 5, Pages 879-888Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn700374d
Keywords
nanoparticle; nanopowder; cerium oxide; PEG; phosphonate; adsorption; nonstoichiometric; redispersible
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Rare earth cerium oxide (ceria) nanoparticles are stabilized using end-functional phosphonated-PEG oligomers. The complexation process and structure of the resulting hybrid core-shell singlet nanocolloids are described, characterized, and modeled using light and neutron scattering data. The adsorption mechanism is nonstoichiometric, yielding the number of adsorbed chains per particle N-ads = 270 at saturation. Adsorption isotherms show a high affinity of the phosphonate head for the ceria surface (adsorption energy Delta G(ads) approximate to -16kT) suggesting an electrostatic driving force for the complexation. The ease, efficiency, and integrity of the complexation is highlighted by the formation of nanometric sized cerium oxide particles covered with a well anchored PEG layer, maintaining the characteristics of the original sol. This solvating brushlike layer is sufficient to solubilize the particles and greatly expand the stability range of the original sol (
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