中国物理B ›› 2013, Vol. 22 ›› Issue (8): 84703-084703.doi: 10.1088/1674-1056/22/8/084703
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
范春珍a b, 王俊俏a, 程永光a, 丁佩c, 梁二军a, 黄吉平b
Fan Chun-Zhen (范春珍)a b, Wang Jun-Qiao (王俊俏)a, Cheng Yong-Guang (程永光)a, Ding Pei (丁佩)c, Liang Er-Jun (梁二军)a, Huang Ji-Ping (黄吉平)b
摘要: Composite nanoparticles (NPs) have the ability of combining materials with different properties together, thus receiving extensive attention in many fields. Here we theoretically investigate the electric field distribution around core/shell NPs (a type of composite NPs) in ferrofluids under the influence of an external magnetic field. The NPs are made of cobalt (ferromagnetic) coated with gold (metallic). Under the influence of the external magnetic field, these NPs will align along the direction of this field, thus forming a chain of NPs. According to Laplace's equations, we obtain electric fields inside and outside the NPs as a function of the incident wavelength by taking into account the mutual interaction between the polarized NPs. Our calculation results show that the electric field distribution is closely related to the resonant incident wavelength, the metallic shell thickness, and the inter-particle distance. These analytical calculations agree well with our numerical simulation results. This kind of field-induced anisotropic soft-matter systems offers the possibility of obtaining an enhanced Raman scattering substrate due to enhanced electric fields.
中图分类号: (Magnetic fluids and ferrofluids)