复合磁性纳米NiFe2O4的制备及光谱特性

用微乳液化学剪裁方法制备了明胶包裹的复合纳米NiFe2 O4 。将明胶和亚铁盐以及镍盐制成凝胶 ,使该凝胶状反应物在微乳液的胶束中剪裁成微粒 ,再被还原 化合 成核长大。生成的微粒处于明胶蛋白分子的包裹之中。用XRD ,TEM ,EDS ,IR等测试表明 :微粒为明胶包裹球形纳米微粒。微球的平均粒径为 10～10 0nm ,单个微粒的粒径 3 3～ 4 6nm。每个复合微球中约有 3～ 2 2个NiFe2 O4 粒子。NiFe2 O4 复合微粉的比饱和磁化强度σs=36 31× 10 3 4π(A·m- 1 ·g- 1 ) ,矫顽力Hc=6 75 0A·m- 1 ,剩磁Br=4 39× 10 3 4π(A·m- 1 ·g- 1 )。

The Preparation of NiFe2O4 Composite Nanoparticles and Spectral Properties

The composite nanoparticles of Ni-ferrite with coated gelatin were prepared with the gel-microemulsion chemical tailoring method. The gelatin FeCl2 and NiCl2 were used to prepare gel, which was tailored to be particles in micellar of microemulsion, and the particles were reduced, compounded and nucleated. Surveying by XRD, TEM, IR and EDS showed that the particles formed were coated by gelatin protein and their mean sizes are in the range of 10-100 nm, and particle sizes are 3.3-4.6 nm. There are about 3-22 NiFe2O4 particles on each spheroid. The measurement of magnetic parameters indicated that the specific saturation magnetization was sigma(s) = 36.31 x 10(3)/4pi(A x m(-1) x g(-1)), coercivity was H(c) = 6750 A x m(-1), and residual magnetism B(r) = 4.39 x 10(3)/4pi(A x m(-1) x g(-1)).