Partic. vol. 6 no. 3 pp. 185-190 (June 2008)
doi: 10.1016/j.partic.2008.03.004

Influence of surface modification of SrFe₁₂O₁₉ particles with oleic acid on magnetic microsphere preparation

Sifang Kong^{a, *}, Peipei Zhang^a, Xiufang Wen^a, Pihui Pi^a, Jiang Cheng^a, Zhuoru Yang^a, Jing Hai^{a, b}

mengsiksf@163.com

Abstract

Oleic acid was used as surface modification agent to improve the hydrophobicity of magnetic strontium hexaferrite particles. The structure and properties of treated magnetic particles were characterized by scanning electronic microscopy (SEM), Fourier transform infrared spectra (FTIR), powder X-ray diffraction (XRD) and magnetic property measurement system (MPMS). The results show that oleic acid is chemically enwrapped on the surface of SrFe₁₂O₁₉ particles. Magnetic particles modified by oleic acid are highly dispersible and strongly responsive to magnetism but with slight decrease in saturated magnetization. The affinity between magnetic particles and monomers is improved by surface modification, resulting in increased particle incorporation in magnetic polymeric microspheres. The surface modification mechanism of magnetic particles by oleic acid is addressed in this work.

Keywords

Oleic acid; Surface modification mechanism; Strontium hexaferrite; Dispersibility; Magnetic polymeric microsphere