There are many methods to prepare  Fe₃O₄ magnetic nanoparticles , such as coprecipitation,thermal decomposition and hydrothermal methods. In this paper,  Fe₃O₄ magnetic nanoparticles wereprepared by three different kinds of methods , and the size, shape and magnetic properties of Fe₃O₄  magnetic nanoparticles were adjusted , and through surface modification to improve its dispersion and stability. The magnetic nanoparticle materials have potential applications in biomedical felds such as drugloading, magnetic tissue engineering etc.

superparamagnetism, nanometre, morphology, surface modification