Open AccessStudy on the Fluidity Experiments of Engine Oil-Based Magnetic Fluid with Fe3O4/Ag Nanoparticles
Author(s) -
Qianhui Cao,
Zhili Zhang,
Nannan Di,
Guobao Zang,
Decai Li
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/678/1/012145
Subject(s) - shear rate , materials science , rheometer , scanning electron microscope , magnetic nanoparticles , superparamagnetism , nanofluid , viscosity , transmission electron microscopy , analytical chemistry (journal) , nanoparticle , magnetorheological fluid , chemical engineering , rheology , nuclear magnetic resonance , magnetization , composite material , nanotechnology , thermodynamics , chemistry , chromatography , magnetic field , physics , quantum mechanics , engineering , damper
In this research, a new engine oil-based Fe 3 O 4 /Ag magnetic fluid is prepared applying the method of modified chemical co-precipitation. This preparation method is green without toxic gases being released. The nanoparticles are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and vibration sample magnetometer (VSM). These characterizations demonstrate that the Fe 3 O 4 /Ag nanoparticles modified by oleic acid are successfully synthesized and uniformly dispersed in the engine oil. The hysteresis loop of this new magnetic fluid shows that it has no remnant magnetism and maintains superparamagnetic properties. Shear stress and viscosity of both Fe 3 O 4 magnetic fluid and Fe 3 O 4 /Ag magnetic fluid are measured by the rotational rheometer. The shear stress increases with the increasing shear rate while the viscosity decreases with the increasing shear rate. What’s more, the viscosity of Fe 3 O 4 /Ag magnetic fluid significantly increases compared with the traditional magnetic fluid.