Pickering-Emulsion-Polymerized Polystyrene/Fe₂O₃ Composite Particles and Their Magnetoresponsive Characteristics

Abstract

Core-shell-structured magnetic polystyrene (PS)/inorganic particles were fabricated by Pickering emulsion polymerization using nanosized Fe2O3 particles as a solid stabilizer. Scanning electron microscopy and transmission electron microscopy confirmed the synthesized PS/Fe2O3 particles to be comprised of a PS surface coated with Fe2O3 nanoparticles. The chemical structure of the composite nanospheres was characterized by Fourier transform infrared spectroscopy and X-ray diffraction. The thermal properties of composite nanospheres and corresponding pure polymer were examined by thermogravimetric analysis. The rheological properties of the core-shell-structured magnetic PS/inorganic particles dispersed in silicone oil were investigated under an external magnetic field strength using a rotational rheometer. The particles with extremely lower density than common magnetic particles exhibited solid-like magnetorheological phase characteristics, and the flow curves were fitted to the Cho-Choi-Jhon model of the rheological equation of state.

Modified nano Fe2O3-epoxy composite with enhanced mechanical properties

“…Nowadays, Fe 2 O 3 -based nanocomposites have been intensively investigated [24][25][26][27][28]. Among of them, [29]. In addition, it is worth noting that the surface modification of the …”

Stimuli-Responsive Polymers and Colloids under Electric and Magnetic Fields

“…Concurrently, in MR fluids, magnetic particles, such as iron, iron oxides (Fe2O3 and Fe3O4), and carbonyl iron (CI), have been developed owing to their high saturation magnetization and suitable magnetic properties [50][51][52][53]. In addition, recent efforts on various composites with magnetic particles with different morphologies have been made to improve the stability of MR suspensions.…”

“…In particular, Fe2O3 NPs have attracted considerable interest for MR applications with a lower density than CI particles and significant magnetic behavior. Kim et al [52] reported core-shell structured PS/Fe2O3 particles constructed by the Pickering emulsion process. The Pickering emulsion technique is considered an eco-friendly strategy, where the solid inorganic particles are used as a stabilizer instead of conventional organic surfactants.…”

D evelopment and Testing of a Closed Loop Feedback Controlled Magnetorheological Fluid Anti-vibration Mount for Onboard Naval Applications

“…Dynamic properties of magnetorheological fluid are extensively utilised worldwide to develop various smart/ intelligent devices [1][2][3][4][5][6][7][8][9][10][11] . These devices supersede their conventional counterparts in term of improved and better control of desired performance and functionalities.…”