| Rheological behavior of fumed silica suspension in polyethylene glycol |
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| 作者姓名： | 伍秋美 阮建明 黄伯云 周忠诚 邹俭鹏 |
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| 作者单位： | State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China |
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| 基金项目： | Project （50174059） supported by the National Natural Science Foundation of China |
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| 摘 要： | The rheological behavior of fumed silica suspensions in polyethylene glycol（PEG） was studied at steady and oscillatory shear stress using AR 2000 stress controlled rheometer. The systems show reversible shear thickening behavior and the shear-thickening behavior can be explained by the clustering mechanism. The viscosity and the degree of shear-thickening of the systems strongly depend on the mass fraction of the silica, the molecular weigh of PEG and the frequency used in the rheological measurement. The silica volume fraction of the systems is 1.16%- 3. 62%, corresponding to the mass fraction of 4%- 9%. The shear-thickening taking place in the low volume fraction may contribute to the fractal nature of the silica. At oscillatory shear stress, when the shear stress is less than the critical stress, the storage modulus decreases significantly, meanwhile the loss modulus and the complex viscosity almost remain unchanged; when the shear stress is larger than the critical stress, the storage modulus, the loss modulus and the complex viscosity increase with the increase of shear stress. The loss modulus is larger than the storage modulus in the range of stress studied and both moduli depend on frequency.
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| 关 键 词： | 煅制氧化硅 悬浮液 聚乙二醇 流变行为 胶体 |
| 文章编号： | 1005-9784（2006）01-0001-05 |
| 收稿时间： | 2005-07-20 |
| 修稿时间： | 2005-10-10 |
Rheological behavior of fumed silica suspension in polyethylene glycol |
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| Wu Qiu-mei , Ruan Jian-ming , Huang Bai-yun , Zhou Zhong-cheng and Zou Jian-peng.Rheological behavior of fumed silica suspension in polyethylene glycol[J].Journal of Central South University of Technology,2006,13(1):1-5. |
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| Authors: | Wu Qiu-mei Ruan Jian-ming Huang Bai-yun Zhou Zhong-cheng and Zou Jian-peng |
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| Affiliation: | (1) State Key Laboratory of Powder Metallurgy, Central South University, 410083 Changsha, China |
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| Abstract: | The rheological behavior of fumed silica suspensions in polyethylene glycol(PEG) was studied at steady and oscillatory shear stress using AR 2000 stress controlled rheometer. The systems show reversible shear thickening behavior and the shear-thickening behavior can be explained by the clustering mechanism. The viscosity and the degree of shear-thickening of the systems strongly depend on the mass fraction of the silica, the molecular weigh of PEG and the frequency used in the rheological measurement. The silica volume fraction of the systems is 1.16% 3.62%, corresponding to the mass fraction of 4%9%. The shear-thickening taking place in the low volume fraction may contribute to the fractal nature of the silica. At oscillatory shear stress, when the shear stress is less than the critical stress, the storage modulus decreases significantly, meanwhile the loss modulus and the complex viscosity almost remain unchanged; when the shear stress is larger than the critical stress, the storage modulus, the loss modulus and the complex viscosity increase with the increase of shear stress. The loss modulus is larger than the storage modulus in the range of stress studied and both moduli depend on frequency. |
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| Keywords: | fumed silica suspension polyethylene glycol shear-thickening storage modulus loss modulus |
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