Preparation and characterization of macromolecular magnetic particle enhanced by PAMAM dendrimers

Fe3O4 nano-particles were prepared by chemical precipitation method.PSt-acrylamide/Fe3O4 magnetic particles were synthesized by suspension method.PAMAM was prepared and then was used to react with the magnetic particles.Magnetic particles enhanced by dendrimers were successfully prepared.Many methods were used to characterize the crystal structure,saturation magnetization,functional group,micro-structure and elemental percentages of NMP and PAMAM-NMP respectively.The results showed that the magnetic core of Fe3O4 was perfect with the average diameter 9 nm.FTIR proved the existence of NH2 with the absorption at 3 478 cm-1 and 3 300 cm-1.The content of N increased from 0.225% to 0.992% after enhanced by PAMAM and proved that the PAMAM provided more active groups for NMP.The deposition time within or without magnetic field was 16 h and 2 112 h respectively,which indicated that the better magnetic response and suspension were obtained by PAMAM-NMP.