铁磁壳层纳米颗粒周围局域电场的研究  

Local Electric Field Distribution Around Core/Shell Nanoparticles in Ferrofluids

作　　者：范春珍[1] 王俊俏[1] 程永光[1] 梁二军[1] 

机构地区：[1]郑州大学物理工程学院,河南郑州450001

出　　处：《郑州大学学报（工学版）》2013年第3期26-29,共4页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(11104252);教育部博导类课题资助项目(2011410111000);河南省基础与前沿资助项目(122300410162);郑州市创新团队资助项目(2011-03)

摘　　要：研究了在外加磁场的影响下,铁磁流体溶液中壳层纳米颗粒周围局域电场的分布.其中,壳层结构的铁磁纳米颗粒是由磁性纳米颗粒(钴)核与贵金属(金)壳组成.该结构将金属的光学性质和颗粒的磁场驱动效应有效地结合起来.在外加磁场的影响下,复合铁磁颗粒将会沿着外加磁场的方向排列,形成磁纳米链.磁纳米链中复合颗粒在外加磁场的影响下发生极化,导致颗粒之间产生相互作用.通过解拉普拉斯方程,可以得到复合颗粒周围局域电场的表达式.计算结果表明,壳层颗粒周围的局域电场与金属壳层厚度、复合颗粒之间的距离以及颗粒中心连线的夹角有密切关系.We investigate the electric field distribution around ferromagnetic nanoparticles （NPs） in ferrofluids under the influence of external magnetic field. Specifically, magnetic core （cobalt） coated with a metallic lay- er （gold） is considered, which incorporated optically actively component with magnetic NPs. Due to the mag- netic response, the core/shell NPs will align along the direction of external magnetic field, thus forming a line- ar NPs chain in the system. With the solution of Laplace＇ s equations, electric fields inside and outside the NPs chain are explored as a function of the incident wavelength operating on the basis of mutual interaction a- mong the polarized particles. Analytical study shows that the maximum magnitude of the electric filed is closely related to the resonant incident wavelength, the metallic shell thickness and the inter-particle distance.

关 键 词：核壳纳米颗粒 拉普拉斯方程 局域电场 

分 类 号：O441.6[理学—电磁学]