Hydrothermal fabrication of octahedral-shaped Fe_3O_4 nanoparticles and their magnetorheological response

摘要

Octahedral-shaped Fe_3O_4 nanoparticles were synthesized in the presence of 1,3-diaminopropane using a hydrothermal method and assessed as a potential magnetorheological (MR) material. Their morphology, crystal structure, and magnetic properties were examined by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and vibrating sample magnetome-try, respectively. The MR characteristics of the octahedral-shaped, Fe_3O_4 nanoparticle-based MR particles when dispersed in silicone oil with a 10 vol. % particle concentration were examined using a rotational rheometer under an external magnetic field. The resulting MR fluids exhibited a Bingham-like behavior with a distinctive yield stress from their flow curves.