The Polymer Society of Korea

Abstract

Magnetically responsive nanoparticles have attracted considerable attention in diverse biomedical applications, including soft actuators, delivery systems, and magnetic resonance imaging, owing to their intrinsic field-responsive magnetic behavior. In this study, silica-based magneto-responsive core-shell nanoparticles with various morphologies were synthesized by varying the concentration of tetraethyl orthosilicate (TEOS). Stearic acid-modified Fe₃O₄ nanoparticles were synthesized via a co-precipitation method, followed by the formation of a silica shell through hydrolysis and condensation of TEOS using the Stöber process. The structural and thermal properties of the resulting core-shell nanoparticles were characterized, and their magneto-responsive performance was investigated. Furthermore, magnetorheological fluids incorporating the optimized core-shell nanoparticles were prepared, and their magnetorheological properties were characterized under various external magnetic fields.