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Clusters of superparamagnetic magnetite nanoparticles encapsulated by thick silica shells (SiO2/cFe3O4) have been recognized as useful only in the role of a magnetically separable supporter. In this report, SiO2/cFe3O4 colloids based on a cFe3O4 core (367 nm) and a series of silica shell thicknesses (24, 47, 91, and 134 nm) were prepared and their charge transfer resistances (Rct) and the redox reactions...
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