Preparation and properties of water-based magnetic fluids

被引:104
作者
Campelj, S. [1 ]
Makovec, D. [1 ]
Drofenik, M. [1 ,2 ]
机构
[1] Jozef Stefan Inst, Dept Mat Synth, Ljubljana, Slovenia
[2] Univ Maribor, Fac Chem & Chem Engn, SI-2000 Maribor, Slovenia
关键词
D O I
10.1088/0953-8984/20/20/204101
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Stable suspensions of superparamagnetic iron oxide nanoparticles in water (water-based ferrofluids) were prepared using citric acid (CA) as a surfactant. The influences of different factors on the amount of nanoparticles in a stable suspension were systematically studied. These factors, including the temperature, the pH value and the concentration of CA applied during the adsorption of the CA onto the nanoparticles and during their suspension in water, were evaluated. The highest content of nanoparticles in a stable suspension was obtained when the CA was absorbed at pH values of around 5.2, where two carboxyl groups are dissociated, and when the nanoparticles were suspended at a pH of around 10, where all three carboxyl groups of the CA are in a dissociated state.
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页数:5
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