通过TEM及SEM表征粒子形态并对产物进行XRD分析,最后测定产物的磁化曲线.在微乳液环境中,NaBH4和N2H4·H2O两种还原体系得到粒子粒径分别为30～40 nm和100 nm,固体粉末产物未烧结时均呈无定形态,结晶性差.从磁化曲线可以看出,NaBH4还原制备的产物呈明显的铁磁性,饱和磁化强度(Ms)为32.28 A·m2·kg-1,剩磁(Mr)为10.98 A·m2·kg-1,产物矫顽力为178 kA·m-1.而N2H4·H2O制备的产物几乎不呈现铁磁性,剩磁和矫顽力接近零.
参考文献
| [1] | Pedro Tartaj;María del Puerto Morales;Sabino Veintemillas-Ver -daguer et al.The analysis of dosimetric thermoluminescent glow peak of α-Al2O3:C after different dose levels by β-irradiation[J].Journal of Physics D:Applied Physics,2003,36:182. |
| [2] | Ivo(ˇs)afa (ˇr)ík;Mirka Safa (ˇr)íková .Magnetic nanoparticles and bioscience[J].Monatshefte Fur Chemie,2002,133:737. |
| [3] | Han G C;Zong B Y;Luo P;Wu Y H .Modeling the extended defect evolution in lateral epitaxial overgrowth of GaN:Subgrain stability[J].Journal of Applied Physics,2003,93:111. |
| [4] | Poddar P;Wilson J L;Srikanth H et al.Grain size influence on soft ferromagnetic properties in Fe-Co nanoparticles[J].Materials Science and Engineering B,2004,106:95. |
| [5] | Michael Spiro;Dionlsia M de Jesus .Nanoparticle catalysis in microemulsions:oxidation of N,N-dimethyl-p-phenylenediamine by cobalt(Ⅲ) pentaammine chloride catalyzed by colloidal palladium in water/AOT/n-heptane microemulsions[J].Langmuir,2000,16:2464. |
| [6] | Sebastien Vaucher;John Fielden;Mei Li;Erik Dujardin;Stephen Mann .Molecule-Based Magnetic Nanoparticles: Synthesis of Cobalt Hexacyanoferrate, Cobalt Pentacyanonitrosylferrate, and Chromium Hexacyanochromate Coordination Polymers in Water-in-Oil Microemulsions[J].Nano letters,2002(3):225-229. |
| [7] | Yao Y D;Chen Y Y;Tai M F et al.Magnetic anisotropy of 3d transition metal clusters and ultrathin films[J].Materials Science and Engineering A,1996,217/218:281. |
| [8] | Pileni M P .Characterisation of water-in-oil microemulsions and organo-gels based on sulphonate surfactants[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,1995,94:231. |
| [9] | Legrand J.;Taleb A.;Gota S.;Guittet MJ.;Petit C. .Synthesis and XPS characterization of nickel boride nanoparticles[J].Langmuir: The ACS Journal of Surfaces and Colloids,2002(10):4131-4137. |
| [10] | 石玉光,廖青.超细金属镍粉的低温液相还原法制备[J].江苏冶金,2003(03):11-13. |
| [11] | 科扬船;皮特斯壮.聚合物-无机纳米复合材料[M].北京:化学工业出版社,2003 |
| [12] | Zhang Xiangyi;Zhang Jinwu;Wang Wenkui .A novel route for the preparation of nanocomposite magnets[J].Advanced Materials,2000,12:1441. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%