Abstract
Particle size is one of the most important requirements for the successful implementation of magnetic nanoparticles in numerous scientific and engineering applications. Here we proposed the use of low-gradient magnetic separation (LGMS) technique for size fractionation of magnetic nanoclusters (NCs) due to its ease of implementation. Poly(sodium 4-styrenesulfonate) (PSS)-grafted iron oxide NCs, with excellent colloidal stability needed for most environmental engineering applications, were employed as a model system to test the effectiveness of our separation strategy. Results showed that successive reduction in average hydrodynamic size and sample polydispersity was achieved after going through LGMS. This size-selection process is independent of initial particle concentration and gives consistent results over a broad range of particle concentration (from 0.025 g/L to 10 g/L). By fine-tuning the externally applied field strength from ∼4600 to ∼1100 gauss, we observed a well-characterized, predictable separ...
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