Electric field distribution around the chain of composite nanoparticles in ferrofluids |
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| Affiliation: | a School of Physical Science and Engineering, and Key Laboratory of Materials Physics of Ministry of Education of China,Zhengzhou University, Zhengzhou 450052, China;b State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China;c Department of Mathematics and Physics, Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou 450015, China |
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| Abstract: | 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. |
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| Keywords: | core/shell nanoparticles electric field distribution Laplace’s equation |
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