Tsedev Ninjbadgar and Dermot F. Brougham Epoxy Ring Opening Phase Transfer as a General Route to Water Dispersible Superparamagnetic Fe3O4 Nanoparticles and Their Application as Positive MRI Contrast Agents Advanced Functional Materials 21
A general method for producing water dispersible superparamagnetic Fe3O4 nanoparticles is presented utilizing ring opening reactions between surface-bound epoxy-ligands and amine functionalities. PEG or arginine stabilized suspensions exhibit high r1 values of 17 s−1 mM−1, and low r2/r1 ratios of 3.3–3.8. This demonstrates high magnetization and excellent water dispersibility of the nanocrystals, as required for applications as positive MRI contrast agents.
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