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Citation: HE Qiang-Fang, LI Guo-Ming, CHEN Shuo. Preparation of Water-based Fe₃O₄ Magnetic Fluid[J]. Chinese Journal of Applied Chemistry, ;2005, 22(6): 665-668. shu

Preparation of Water-based Fe₃O₄ Magnetic Fluid

1.
a Department of Chemistry, Guangdong Education Institute, Guangzhou;
2.
b Department of Chemistry, South China Normal University, Guangzhou 510631

Corresponding author: LI Guo-Ming,
Received Date: 28 July 2004
Available Online: 3 November 2004

Water-based Fe₃O₄ magnetic fluid was prepared by chemical co-precipitation in the presence of a surfactant PEG-4000.The effects of preparation conditions such as pH value,n(Fe³⁺)/n(Fe²⁺),temperature and PEG mass concentration on the formation and the stability of the magnetic fluid were investigated.The results show that under the conditions of pH value between 12 and 13,n(Fe³⁺):n(Fe²⁺)=1.75:1~2:1,PEG mass concentration of 50 g/L and temperature 60℃,the water-based magnetic fluid was obtained with strong magnetism and good stability.The TEM image shows that the particles of the magnetic fluid were square with an average size of about (20±5) nm.The magnetic fluid did not show obvious sedimentation trend in 48 hours without external magnetic field.The magnetic susceptibility of the magnetic fluid powder was measured by means of a magnetic balance,and the results show that the magnetic susceptibility was high,and increased with the increase of the magnetic field strength,which shows that the Fe₃O₄ nanoparticles were paramagnetic.
- water-based magnetic fluid,
- chemical co-precipitation,
- Fe₃O₄
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Preparation of Water-based Fe₃O₄ Magnetic Fluid