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