Magnetic field controlled particle-mediated growth inducing icker-like silver architectures

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• 作者：Yunxia Zhang ; Shaodong Sun ; Xiaozhe Zhang ; Linli Tang ; Xiaoping Song ; Bingjun Ding ; Zhimao Yang
• 关键词：Silver architectures ; Replacement reaction ; Magnetic field effect ; Crystal growth
• 刊名：Chemical Engineering Journal
• 出版年：15 March, 2014
• 年：2014
• 卷：240
• 期：Complete
• 页码：494-502
• 全文大小：1519 K

文摘

An unusually anisotropic growth or quasi-one-dimension growth of silver architectures can be achieved when an external magnetic field is applied to a simple replacement reaction. The external magnetic field greatly promotes the growth of trunks along 銆? 1 1銆?directions but weakens the growth of branches along 銆? 1 1銆?directions, resulting in a silver icker-like architectures. The influences of the external magnetic field, solution concentration and reaction time have been investigated in detail. The formation of silver icker-like architectures could be attributed to shape magnetic anisotropy and fast complex micro-magnetohydrodynamic (MHD) convection effects induced by the external magnetic field of the nanoparticles possessing a truncated octahedron structure. Moreover, the magnetic field effect on the crystal growth of nanostructures generally involves the ion-mediated growth process or the aggregations of numerous nanoparticles along the magnetic field directions because of dipolar interactions. Our experiments and discussions, however, indicate that metal crystals are grown through a multistep particle-mediated growth process with the nanoparticles as basic building blocks.