Segregation Behavior of Super Paramagnetic Fe3O4 Nanoparticles in Solution Flowing in Gradient Magnetic Field

Oxygen and nitrogen molecules in liquid air may segregate in gradient magnetic field, which has potential applications in medicine, industry and other fields. According to the segregation behavior of magnetic nanoparticles in gradient magnetic field, magnetic drug carrier particles can be directionally guided to target areas in target therapy, which will improve the utilization of drugs and reduce the side effects of drugs on organs. We prepared super paramagnetic Fe3O4 nanoparticles coated with ammonium citrate with average diameter 13nm. We explored the effects of solution flow rate and magnetic field gradient on the segregation behaviors of super paramagnetic Fe3O4 nanoparticles in spiral flow channel. Results show that nanoparticle segregation is obvious with low solution flow rate and high gradient magnetic field.