Fe3O4 nanoparticles anchoring onto graphitic carbon nitrogen nanosheets for enhanced magneto-stimuli responses and sedimentation stability

A kind of novel two-dimensional magnetic nanocomposites were successfully fabricated via the immobilization of Fe 3 O 4 nanoparticles onto the surface of graphitic carbon nitrogen (g-C 3 N 4 ) nanosheets by a facile liquid exfoliated method and subsequent solvothermal reaction. The structural, morphological, compositional, thermal and magnetic characteristics of the as-prepared samples were systematically assessed by employing a wide spectrum of characterization techniques. Subsequently, the as-constructed Fe 3 O 4 /g-C 3 N 4 composites were exploited to fabricate a stable magnetorheological (MR) suspension, and the rheological performances and sedimentation stability of the designed MR fluid were evaluated through a rotational rheometer and a visual observation method, respectively. The experimental results revealed that the established MR fluid demonstrated an obvious enhancement in sedimentation stability in comparison with that of another a kind of suspension containing carbonyl iron particles. The higher sedimentation stability realized in this MR smart system can be associated primarily with the dispersed Fe 3 O 4 /g-C 3 N 4 composite particles with ultrathin sheet-like nanostructure and the reduced density mismatch.