Correlation of the dielectric properties of dispersed particles with the electrorheological effect
文献类型：期刊论文
| 作者 | Hao, T; Xu, ZM; Xu, YZ |
| 刊名 | JOURNAL OF COLLOID AND INTERFACE SCIENCE
 |
| 出版日期 | 1997-06-15 |
| 卷号 | 190期号:2页码:334-340 |
| 关键词 | Dielectric Properties Oxidized Polyacrylonitrile And Aluminosilicate Silicone Oil Suspensions Electrorheological Effect |
| ISSN号 | 0021-9797 |
| 英文摘要 | The dc field theological properties and frequency dependent dielectric properties of a set of electrorheological (ER) fluids composed of oxidized polyacrylonitrile or aluminosilicate materials dispersed in silicone oil were examined in this paper. Our experimental investigations show that there is a complicated relationship between the dielectric properties of dispersed particles and the ER effect. The dielectric loss of dispersed particles, which has not attracted much attention in previous work, was found to play a considerable role in ER response. The large dielectric loss tangent, experimentally around 0.10 at 1000 Hz, is found to be needed for a strong ER effect. A good ER solid material should first have large dielectric loss, and then the higher the dielectric constant, the stronger the ER effect. The large dielectric loss would facilitate the turning of dispersed particles, and the high dielectric constant would maintain the fibrillation structure stable and strong. Two processes, the particle turning process and the particle polarization process, are thought to be involved in ER activity. Our findings, in connection with the Wagner model, can better explain why the strongest ER effect occurs at particle conductivity of 10(-7) S/m; why the shear stress of some ER fluids decreases with frequency while with others the shear stress increases with frequency; and why trace water can enhance the ER effect considerably, which would help in understanding the mechanism of the ER effect. Too large a dielectric loss is thought to be unfavorable for the ER effect, and its suitable range is worth further study. The results also present a method of designing high performance ER fluids, which would significantly promote development of electrorheology and its application in industrial areas. (C) 1997 Academic Press. |
| 语种 | 英语 |
| WOS记录号 | WOS:A1997XJ17800011 |
| 出版者 | ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/44803]  |
| 专题 | 中国科学院化学研究所 |
| 作者单位 | 1.CHINESE ACAD SCI,INST PHYS,BEIJING 100080,PEOPLES R CHINA 2.CHINESE ACAD SCI,INST CHEM,BEIJING 100080,PEOPLES R CHINA |
| 推荐引用方式 GB/T 7714 | Hao, T,Xu, ZM,Xu, YZ. Correlation of the dielectric properties of dispersed particles with the electrorheological effect[J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE,1997,190(2):334-340. |
| APA | Hao, T,Xu, ZM,&Xu, YZ.(1997).Correlation of the dielectric properties of dispersed particles with the electrorheological effect.JOURNAL OF COLLOID AND INTERFACE SCIENCE,190(2),334-340. |
| MLA | Hao, T,et al."Correlation of the dielectric properties of dispersed particles with the electrorheological effect".JOURNAL OF COLLOID AND INTERFACE SCIENCE 190.2(1997):334-340. |
入库方式： OAI收割
来源：化学研究所
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