林立华,周群,卜胜利.经 Fe(NO3 ) 3 处理的 γ-Fe2 O3 / Ni2 O3复合纳米微粒分析[J].表面技术,2015,44(9):72-77.
LIN Li-hua,ZHOU Qun,PU Sheng-li.Analysis of γ-Fe2O3 / Ni2O3 Composite Nanoparticles after Fe(NO3) 3 Treatment[J].Surface Technology,2015,44(9):72-77 |
| 经 Fe(NO3 ) 3 处理的 γ-Fe2 O3 / Ni2 O3复合纳米微粒分析 |
| Analysis of γ-Fe2O3 / Ni2O3 Composite Nanoparticles after Fe(NO3) 3 Treatment |
| 投稿时间：2015-06-18 修订日期：2015-09-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2015.09.012 |
| 中文关键词: 复合纳米微粒 核-壳结构 Fe(NO3)3 处理 磁化强度 抗腐蚀层 |
| 英文关键词:composite nanoparticles core-shell structure Fe(NO3 ) 3 treatment magnetization strength anti-corrosion layer |
| 基金项目:上海高校青年教师培养资助计划(ZZSLG14029) |
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| 中文摘要: |
| 目的 研究经 Fe(NO3)3 处理后 γ-Fe2O3 / Ni2O3 复合纳米微粒稳定分散在磁性液体中的机理。方法 使用共沉淀法制备 FeOOH/ Ni(OH)2 前躯体,经 FeCl2 溶液处理后得到以 γ-Fe2O3 为核心,Ni2O3在外层,FeCl3·6H2O 在最外层的核-壳结构 γ-Fe2O3 / Ni2O3 复合纳米微粒。 用硝酸铁溶液对其进一步处理,使微粒表面性质稳定以适合配制离子型磁性液体。 使用振动样品磁强计、透射电子显微镜、X 射线衍射仪、X 射线光电子能谱仪对硝酸铁处理后复合纳米微粒的磁性、形态、晶体结构、化学组成及结构进行分析。 结果 经硝酸铁处理后,微粒的磁性减弱,粒径略微变大,约为 11 nm,但位于微粒核心的主要成分 γ-Fe2O3 保持不变,且在微粒表面包裹了一层 Fe(NO3)3·9H2O 抗腐蚀层。 结论 经Fe(NO3)3处理后微粒表面包裹的抗腐蚀层及配制磁性液体时微粒表面吸附同种 H+或 OH-形成的静电斥力,使微粒在磁性液体中稳定分散。 |
| 英文摘要: |
| Objective To investigate the mechanism of γ-Fe2O3 / Ni2O3 composite nanoparticle stably dispersed in the ferrofluids after Fe(NO3)3 treatment. Methods The FeOOH/ Ni(OH)2 precursor was prepared by coprecipitation, and was then treated with the FeCl2 solution to obtain composite nanoparticles containing γ-Fe2O3 core, Ni2O3 external shell and FeCl3·6H2O outermost layer. The nanoparticles were then treated with Fe(NO3)3 to obtain modified particles with stable surface properties for the preparation of ionic ferrofluids. The magneticity, morphology, crystal structure, chemical composition and structure of the composite nanoparticles after Fe( NO3 ) 3 treatment were analyzed by VSM, TEM, XRD, EDX and XPS. Results The particles after treatment were slightly larger (about 11 nm), but the major component γ-Fe2 O3 located in the core of particles remained unchanged. And the surface of the particles was covered with a Fe(NO3 ) 3 ·9H2 O corrosion-resistant layer. Conclusion The corrosion-resistant layer covering the particles after Fe(NO3 ) 3 treatment and the electrostatic repulsion formed by the same species H+ or OH- adsorbed onto the surface of the particles during the preparation of magnetic liquid made the particles stably dispersed in the ferrofluids. |
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