摘要
Kaolinite/TiO2 coated nanocomposite particles were synthesized by using a sol-gel technique and electrorheological fluids (ERF) prepared by dispersing the particles in silicone oil. Particle characterization was carried out by XRD, FT-IR, SEM etc. Structure analysis showed that TiO2 was deposited on the surface of the kaolinite with anatase nano-crystallites. A distinct enhancement in the yield stress, under a dc electric field, compared to that of pure kaolinite and pure TiO2was found by using such particles due to a synergistic effect. The yield stress of the optimum titania-coated kaolinite suspension was about 3.40 kPa at 3 kV mm-1 and 4.45 kPa at 4 kV mm-1, which were 5 times of that of a pure kaolinite suspension. The yield stress of kaolinite-TiO2 nanocomposite ERF showed a marked dependence on the mass percent of TiO 2in the composite particle; when the content of TiO2 was about 34 wt%, the yield stress of kaolinite-TiO2 ER fluid reached its maximum. The improvement of the dielectric properties of the kaolinite-TiO2 nanocomposite is the intrinsic reason for the enhancement of the rheological properties. Furthermore, the electrorheological fluid also exhibits good temperature effect and sedimentation properties.
源语言 | 英语 |
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页(从-至) | 2248-2253 |
页数 | 6 |
期刊 | Journal of Materials Chemistry |
卷 | 13 |
期 | 9 |
DOI | |
出版状态 | 已出版 - 1 9月 2003 |