摘要
用多元醇还原法制备出平均粒径为6.0nm的Fe3O4磁性纳米粒子,并用盐酸溶液(1mol/L)对其进行酸化处理,然后利用反相微乳液法,在OP-10/正丁醇/环己烷/浓氨水反相微乳体系中制备出Fe3O4@SiO2磁性纳米复合粒子.利用X射线衍射(XRD)仪,透射电子显微镜(TEM),傅立叶-红外光谱仪(FT-IR)和振动样品磁强计(VSM)对复合粒子进行表征.结果表明:SiO2成功包覆在Fe3O4磁性纳米粒子表面,制得的复合粒子平均粒径为25.0nm,呈球形且分散均匀,包覆后饱和磁化强度有所下降,但矫顽力仍趋近于零,显示超顺磁性.
The Fe3O4 magnetite nano-particles with average particle size of about 6.0 nm were prepared with polyol reduction method.Then the magnetite nanoparticles were acidized with hydrochloric acid solution（1 mol/L）.Finally,Fe3O4@SiO2 composite nanoparticles were synthesized in OP-10/n-butanol/cyclohexane/ammonia reverse micro-emulsion system.The composite nanoparticles were characterized with X-ray powder diffraction（XRD）,transmission electron microscopy（TEM）,Fourier transform infrared spectroscopy（FT-IR）,and vibrating sample magnetometer（VSM）.The result showed that the surface of Fe3O4 nanoparticles was successfully coated by the silica.The Fe3O4@SiO2 nanoparticles with average size of 25.0 nm,were spherical in shape and dispersed more uniformlly.As the coating had performed,the specific saturation magnetization decreased to some extent,but the coercivity was still close to zero,manifesting their superparamagnetic properties.
出处
《兰州理工大学学报》
CAS
北大核心
2011年第2期22-25,共4页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(51061009)
