Magnetic-field-induced chain-like assembly structures of nanoparticlesW.-X. Fang, Z.-H. He, X.-Q. Xu, Z.-Q. Mao and H. Shen
State Key Laboratory of Optoelectronic Materials and Technologies, and School of Physics and Engineering, Sun Yat-sen University - Guangzhou, 510275, PRC
received 31 August 2006; accepted in final form 26 January 2007; published March 2007
published online 1 March 2007
By controlling the time to apply magnetic field to a magnetic fluid with polymer acrylic resin and by evaporating the solvent, linear chain-like structures were obtained and fixed. Optical microscopy and transmission electronic microscopy (TEM) were used to observe the assembly structures of the fixed magnetic nanoparticles. We found that the chain-like structures with size even down to hundreds nanometers had smaller substructures. A picture of aggregation between linear chain-like substructures is proposed to understand the formation of the macrostructure in magnetic fluid induced by a magnetic field. Two basic aggregations, the coarsening and the connection of the substructures, were observed.
81.16.Dn - Self-assembly.
75.50.Mm - Magnetic liquids.
82.35.-x - Polymers: properties; reactions; polymerization.
© Europhysics Letters Association 2007