Author_Institution :
Dept. of Phys., Yeungnam Univ., Gyeongsan, South Korea
Abstract :
The Fe3O4 nanoparticles were synthesized by a coprecipitation method, and their particles were capsulated by 3-thiopheneacetic acid (3TA), 2, 3-meso-dimercaptosuccinic acid (DMSA) and Polyethylene glycol (PEG), respectively. The 3TA-, PEG-, and DMSA-coated Fe3O4 nanoparticles are well dispersed in aqueous solution. The average particle sizes of the Fe3O4 and the 3TA-, PEG-, and DMSA-coated magnetite nanoparticles were exhibited approximately 10.4, 12, 11, and 12 nm by TEM results. The mean blocking temperatures of the uncoated Fe3O4 and the 3TA, PEG, DMSA surface-coated Fe3O4 nanoparticles exhibited about 245±10 K, 220±10 K, 142±12 K, and 200±10 K, respectively. The values of g factor of the uncoated Fe3O4 and the 3TA-, PEG-, and DMSA-coated Fe3O4 nanoparticles were obtained 2.22, 2.21, 2.22, and 2.19, respectively.
Keywords :
coatings; coercive force; ferrites; g-factor; magnetic particles; nanofabrication; nanomagnetics; nanoparticles; particle size; precipitation; superparamagnetism; surface treatment; transmission electron microscopy; 2,3-meso-dimercaptosuccinic acid; 3-thiopheneacetic acid; Fe3O4; TEM; aqueous solution; coercivity; coprecipitation; dispersions; g factor; magnetic properties; magnetization; particle size; polyethylene glycol; superparamagnetic magnetite nanoparticles; surface coating; surface modification; transmission electron microscopy; Iron; Magnetic properties; Magnetic resonance imaging; Nanoparticles; Saturation magnetization; Surface morphology; Temperature measurement; g factor; magnetite; magnetization; spin resonance; superparamagnetic;
