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Chin. Phys. B, 2013, Vol. 22(8): 084703    DOI: 10.1088/1674-1056/22/8/084703

Electric field distribution around the chain of composite nanoparticles in ferrofluids

Fan Chun-Zhena b, Wang Jun-Qiaoa, Cheng Yong-Guanga, Ding Peic, Liang Er-Juna, Huang Ji-Pingb
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
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.
Keywords:  core/shell nanoparticles      electric field distribution      Laplace’s equation  
Received:  25 December 2012      Revised:  15 April 2013      Published:  27 June 2013
PACS:  47.65.Cb (Magnetic fluids and ferrofluids)  
  41.20.Cv (Electrostatics; Poisson and Laplace equations, boundary-value problems)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11104252 and 11222544), the Science Fund of the Ministry of Education of China (Grant No. 20114101110003), the Fund for Science and Technology Innovation Team of Zhengzhou City (2011-03), the Aeronautical Science Foundation of China (Grant No. 2011ZF55015), the Basic and Frontier Technology Research Program of Henan Province, China (Grant Nos. 112300410264 and 122300410162), the Cooperation Fund with Fudan University, China (Grant No. KL2011-01), the Fok Ying Tung Education Foundation, China (Grant No. 131008), the Program for New Century Excellent Talents in University (Grant No. NCET-12-0121), and the National Key Basic Research Program of China (Grant No. 2011CB922004).
Corresponding Authors:  Fan Chun-Zhen, Liang Er-Jun, Huang Ji-Ping     E-mail:;;

Cite this article: 

Fan Chun-Zhen, Wang Jun-Qiao, Cheng Yong-Guang, Ding Pei, Liang Er-Jun, Huang Ji-Ping Electric field distribution around the chain of composite nanoparticles in ferrofluids 2013 Chin. Phys. B 22 084703

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