Synthesis of Hollow Fe3O4 Magnetic Nanospheres and Their Application in Magnetorheological Fluids

Abstract

Magnetorheological fluid (MRF) is a rapidly developing emerging intelligent material with excellent properties, featuring fast response time, reversible rheological properties, controllable mechanical properties and a wide range of operating temperature. It is widely used in engineering fields such as shock absorbers, clutches, sensors and dampers. In this paper, hollow structured Fe3O4 magnetic nanospheres were synthesized by using a facile one-step hydrothermal method, and then their comprehensive properties such as morphology, structure and magnetic properties were thoroughly characterized by using analytical techniques such as scanning electron microscope, transmission electron microscope, X-ray diffraction and superconducting quantum magnetic interferometry, and then, a homogeneous magnetorheological fluid was prepared by using the prepared hollow Fe3O4 magnetic nanospheres as the dispersed phase, and finally the rheological properties and sedimentary stability of magnetorheological fluid were tested by rotational rheometer and direct observation method respectively.