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Hydrodynamic Properties of Fe3O4 Kerosene-Based Ferrofluids with Narrow Particle Size Distribution |
| ZHANG Jian-Hui1,2;XU Xue-Fei1;SI Ming-Su1;ZHOU You-He1;XUE De-Sheng1 |
| 1Key laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou 730000
2School of Mechatronic Engineering, Lanzhou Jiaotong University, Lanzhou 730070 |
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| Cite this article: |
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ZHANG Jian-Hui, XU Xue-Fei, SI Ming-Su et al 2005 Chin. Phys. Lett. 22 2944-2946 |
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Abstract We investigate the hydrodynamic properties of Fe3O4 kerosene-based ferrofluids with narrow particle size distribution. The ferrofluids are synthesized by improving chemical coprecipitation technique. A narrow distribution of 8.6--10.8nm particle sizes is obtained from the magnetization curve with the free-form model based on the Bayesian inference theory. The fitting result is consistent with average particle size obtained from x-ray diffraction. With the increase of applied magnetic field and magnetic particle concentration, apparent viscosity of ferrofluids increases. At concentration 4.04%, the type of flow for the ferrofluid transforms from Newtonian to Bingham plastic fluid as the applied magnetic field increases.
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| Keywords:
75.50.Mm
47.65.+a
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Published: 01 November 2005
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