Dispersion mechanism of nano-magnetite coated with oleate in aqueous carrier  

作　　者：胡岳华 刘建平 徐竸 王淀佐 

机构地区：[1]School of Resources Processing and Bioengineering, Central South University,Changsha 410083, China

出　　处：《Journal of Central South University of Technology》2008年第5期663-668,共6页中南工业大学学报（英文版）

基　　金：Project(50374083) supported by the National Natural Science Foundation of China;Project(134375215) supported by the Research Fund for Postgraduate Innovation Project of Central South University, China

摘　　要：To investigate dispersion mechanism of water-based ferrofluid, the effects of electrolytes on the dispersibility of ferrofluid in the dispersing system with different pH values were discussed. The ζ-potential of magnetic nano-particles was measured to discover the adsorbent state of oleate group on the surface of magnetite particles. The mechanism that coexisting electrolyte influences the dispersibility was studied. The results show that the electrolyte affects the stability of ferrofluid through an effect on the structure of surfactant bilayer adsorption, which was proved by ζ-potential measured. The associated mechanism of steric and electrostatic is dominant in aqueous ferrofluid.To investigate dispersion mechanism of water-based ferrofluid, the effects of electrolytes on the dispersibility of ferrofluid in the dispersing system with different pH values were discussed. The ζ-potential of magnetic nano-particles was measured to discover the adsorbent state of oleate group on the surface of magnetite particles. The mechanism that coexisting electrolyte influences the dispersibility was studied. The results show that the electrolyte affects the stability of ferrofluid through an effect on the structure of surfactant bilayer adsorption, which was proved by ζ-potential measured. The associated mechanism of steric and electrostatic is dominant in aqueous ferrofluid.

关 键 词：nano-magnetite ELECTROLYTE DISPERSIBILITY ζ-potential dispersion mechanism 

分 类 号：O614.811[理学—无机化学]