One-step microwave synthesis of functionalized magnetic nanoparticles
Résumé
Functionalized superparamagnetic iron oxide nanoparticles have been synthesized according to a one-step process with the aim to produce stable water-dispersible nanoparticles with a well-crystalized spinel structure. Microwave technology is implemented here to fulfill this objective considering method’s ease, speed and reproducibility1. Several parameters have been modified and optimized (temperature, synthesis time, stirring, ratio molar between iron and ligands, volume of basis, power of microwave). The obtained nanoparticles are characterized by TEM, DLS, XRD, FTIR, TGA and magnetic measurements to understand the relations between the size, the shape, the composition and the magnetic properties. The functionalization efficiency (by citrate in standard conditions) is demonstrated using several complementary techniques. This functionalization in-situ is showing that is the main element to obtain nanoparticles without aggregation and stable in water. Magnetic measurements indicate the superparamagnetic behavior of nanoparticles with high saturation magnetization. The properties of stable water-dispersible iron oxide nanoparticles combined with the potential for use and modification of functionalized layer make these hybrid systems, developed in one-step in water, prime candidates for future healthcare and environmental applications.(1) Venturini, P.; Fleutot, S.; Cleymand, F.; Hauet, T.; Dupin, J.; Ghanbaja, J.; Martinez, H.; Robin, J.; Lapinte, V. Facile One‐Step Synthesis of Polyoxazoline‐Coated Iron Oxide Nanoparticles. ChemistrySelect 2018, 3 (42), 11898–11901.