Synthesis of Magnetic Iron OXIDE CORE-Shell Nanoparticles with Tunable Coating Thickness for Enviromental Remediation
AIChE Annual Meeting
Monday, November 14, 2016 - 10:00am to 12:30pm
A method to synthesize magnetic iron oxide nanoparticles with a crosslinked polystyrene shell using surface initiated atom transfer radical polymerization (ATRP) is presented. The core-shell magnetic nanoparticles were developed to capture contaminents (e.g., polychlorinated biphenyls, PCBs) from contaminated water sources. First, Fe3O4Â nanoparticles were prepared by reacting aqueous ferric chlorides with ammonium hydroxide. The initiator for ATRP, 2-bromo-2-methyl propionic acid (BMPA), was then coated onto the surface of the magnetic nanoparticles via ligand exchange. Finally, the BMPA-coated nanoparticles underwent ATRP process with styrene and curcumin multiacrylate (CMA) in organic media using copper and 4,4â??-dinoyl-2,2â??-dipyridil (DNDP) to carry out the controlled/â?livingâ? polymerization. The synthesized core-shell nanoparticles were then washed and stored in dimethysulfoxide (DMSO). Dynamic light scattering (DLS) was used to characterize the size of uncoated and coated nanoparticle as a function of reaction time. Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and X-ray diffraction (XRD) were used to confirm the properties and presence of the polymeric shell. UV-visible spectroscopy was used to evaluate the stability of modified nanoparticles in DMSO solution. Overall, controlled shell thickness of the core-shell nanoparticles was demonstrated as a function of reaction time, obtaining nanoparticles with magnetic properties and shell network components that offer great promise for environmental remediation applications.