Abstract
The aggregation behavior of superparamagnetic iron oxide nanoparticles in an aqueous medium has been studied using SQUID magnetometry and XRD analysis. Iron oxide nanoparticles were synthesized by the coprecipitation method using iron salt and sodium hydroxide as precursors. The reactions were initially carried out at high temperature with different concentrations of iron salt. The synthesized nanoparticles were then collected for subsequent bio-functionalization. Structural characterizations were done using XRD and TEM measurements and show that the particles are magnetite (cubic spinel structure) with an average size of 9.5 nm. Magnetic measurements done using SQUID predict a magnetic particle size of 7.75 nm, which suggests a "magnetically dead layer" is present on the surface.
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