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镍等磁性纳米粒子一维"豆荚"型结构的制备和磁化特征(10774138)
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中文摘要： 本课题在一维链纳米结构的制备、表征和应用方面取得了系列成果，已经发表SCI检索论文20篇，其中影响因子大于3的有11篇。获得两项国家发明专利。代表性工作包括：通过在超临界CO2体系中分解二茂铁成功制备了非晶碳层包裹的Fe3O4纳米粒子一维链，这些链是由一定数量的单磁畴Fe3O4粒子沿着平行于非晶碳层的方向有序排列而成的。Fe3O4纳米粒子的粒径范围为40-120nm,且每两个相邻粒子间的间距几乎相等。研究发现粒子间的强磁偶极子相互作用促使纳米粒子自组装形成有序的一维链状结构。磁测量和磁力显微镜表征揭示一维链在室温下呈现长程铁磁有序。在基于Fe3O4纳米粒子一维链磁响应液态光子晶体和BRAGG反射器制备方面取得了很大进展，通过控制间距，制备了对红、蓝等特定波长有异常反射的磁响应BRAGG反射器。在特殊一维结构—环的大量制备和组装规律方面取得了新的进展，通过对形成机理的深入研究，能够可控制备大量一维环状磁通闭合态结构。 中文主题词： 一维链纳米结构;一维环状磁通闭合态结构;一维链磁响应液态光子晶体;Fe3O4 纳米粒子 英文摘要: 19 papers have been published under the financial support by the project of the National Natural Science Foundation of China under Grant No. 10774138, including 11 papers with IF higher than 3. For example, magnetite chains with a number of magnetite particles arranged in a line parallel to the outer amorphous carbon coating have been prepared. The sizes of the nanoparticles range from 40 to 120 nm, with nearly identical gaps between every two adjacent particles. The synthesized chains display ferromagnetic properties with several single-magnetic-domain (SD) nanoparticles assembled in an orderly fashion. Based on the formation process of chains in our reaction system, it is suggested that the localized environments favor the growth of SD nanoparticles, and the strong magnetic dipolar–dipolar interactions lead to the self-assembly of SD nanoparticles. Superparamagnetic colloidal nanochains (CNCs) coated and linked by carbon were prepared by solvothermal decomposition of ferrocene at a temperature of 180-200 °C with a 0.20 T magnetic-field applied. It is demonstrated that CNCs with different intraparticle spaces (216, 186, and 173 nm) can be obtained by changing the reaction temperature. Under the induction of an external magnetic field (e.g., 0.10 T), the ethanol suspension of the three samples can diffract different wavelengths of visible light, displaying red, green, and blue color, respectively. The three samples did not show the dependence of the diffraction wavelength on the strength of induction magnetic field, which indicates that the superparamagnetic CNCs can be used as magnetic-responsive Bragg reflectors. 英文主题词： 1D nanostructures; 1D nanorings; magnetic-responsive liquid Bragg reflectors of 1D chains; magnetite nanoparticles |
2楼2013-02-22 21:02:03
