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 Fe3O4 nanoparticles onto the surface of graphitic carbon nitrogen (g-C3N4) 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 character-ization techniques. Subsequently, the as-constructed Fe3O4/g-C3N4 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 sta-bility in comparison with that of another a kind of suspension containing carbonyl iron par-ticles. The higher sedimentation stability realized in this MR smart system can be associated primarily with the dispersed Fe3O4/g-C3N4 composite particles with ultrathin sheet-like nanostructure and the reduced density mismatch. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).