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• W1988677712 endingPage "33" @default.
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• W1988677712 abstract "The time-evolutions of nanoparticle hydrodynamic radius and aggregate fractal dimension during the aggregation of fullerene (C60) nanoparticles (FNPs) were measured via simultaneous multiangle static and dynamic light scattering. The FNP aggregation behavior was determined as a function of monovalent (NaCl) and divalent (CaCl2) electrolyte concentration, and the impact of addition of dissolved natural organic matter (humic acid) to the solution was also investigated. In the absence of humic acid, the fractal dimension decreased over time with monovalent and divalent salts, suggesting that aggregates become slightly more open and less compact as they grow. Although the aggregates become slightly more open, the magnitude of the fractal dimension suggests intermediate aggregation between the diffusion- and reaction-limited regimes. We observed different aggregation behavior with monovalent and divalent salts upon the addition of humic acid to the solution. For NaCl-induced aggregation, the introduction of humic acid significantly suppressed the aggregation rate of FNPs at NaCl concentrations lower than 150 mM. In this case, the aggregation was intermediate or reaction-limited even at NaCl concentrations as high as 500 mM, giving rise to aggregates with a fractal dimension of 2.0. For CaCl2-induced aggregation, the introduction of humic acid enhanced the aggregation of FNPs at CaCl2 concentrations greater than about 5 mM due to calcium complexation and bridging effects. Humic acid also had an impact on the FNP aggregate structure in the presence of CaCl2, resulting in a fractal dimension of 1.6 for the diffusion-limited aggregation regime. Our results with CaCl2 indicate that in the presence of humic acid, FNP aggregates have a more open and loose structure than in the absence of humic acid. The aggregation results presented in this paper have important implications for the transport, chemical reactivity, and toxicity of engineered nanoparticles in aquatic environments." @default.
• W1988677712 created "2016-06-24" @default.
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• W1988677712 date "2013-02-01" @default.
• W1988677712 modified "2023-10-16" @default.
• W1988677712 title "Aggregation rate and fractal dimension of fullerene nanoparticles via simultaneous multiangle static and dynamic light scattering measurement" @default.
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• W1988677712 doi "https://doi.org/10.1016/j.jcis.2012.09.088" @default.
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