| INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Induced dipole dominant giant electrorheological fluid |
| Rong Shen(沈容)1, Kunquan Lu(陆坤权)1,†, Zhaohui Qiu(邱昭晖)2, and Xiaomin Xiong(熊小敏)2 |
1 Beijing National Laboratory for Condensed Matter Physics, Key Laboratory of Soft Matter and Biological Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physics, Sun Yat-sen University, Guangzhou 510275, China |
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Abstract Traditional dielectric electrorheological fluid (ER) is based on the interaction of dielectric particle polarization, and the yield stress is low, which cannot meet the application requirements. The giant ER (GER) effect is caused by orientations and interactions of polar molecules adsorbed on the particle surfaces. Despite the high yield stress, these polar molecules are prone to wear and fall off, resulting in a continuous reduction in shear stress of GER liquid, which is also not suitable for application. Here we introduce a new type of ER fluid called induced dipole dominant ER fluid (ID-ER), of which the particles contain oxygen vacancies or conductor microclusters both prepared by high energy ball milling (HEBM) technique. In the electric field $E$, oxygen vacancies or conductor microclusters form induced dipoles. Because the local electric field $E_{\rm loc}$ in the gaps between particles can be two to three orders of magnitude larger than $E,$ the induced dipole moments must be large. The strong interactions of these induced dipoles make the yield stress of the ID-ER fluid reaching more than 100 kPa. Since there are oxygen vacancies or conductor microclusters everywhere in the particles, the particles will not lose the function due to surface wear during use. The experimental results show that the ID-ER fluid possesses the advantages of high shear stress, low current density, short response time, good temperature stability, long service life, and anti-settlement, etc. The comprehensive performance is much better than the existing ER materials, and also the preparation method is simple and easy to repeat, thus it should be a new generation of ER fluid suitable for practical applications.
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Received: 08 March 2023
Revised: 22 March 2023
Accepted manuscript online: 16 April 2023
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PACS:
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83.80.Gv
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(Electro- and magnetorheological fluids)
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77.22.Ej
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(Polarization and depolarization)
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61.72.jd
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(Vacancies)
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81.20.Wk
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(Machining, milling)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0403000) and the National Natural Science Foundation of China (Grant No. 11874430). |
Corresponding Authors:
Kunquan Lu
E-mail: lukq@iphy.ac.cn
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Cite this article:
Rong Shen(沈容), Kunquan Lu(陆坤权), Zhaohui Qiu(邱昭晖), and Xiaomin Xiong(熊小敏) Induced dipole dominant giant electrorheological fluid 2023 Chin. Phys. B 32 078301
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