期刊
JOURNAL OF MATERIALS SCIENCE
卷 54, 期 9, 页码 6971-6981出版社
SPRINGER
DOI: 10.1007/s10853-019-03360-8
关键词
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资金
- National Natural Science Foundation of China [11572309]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB22040502]
- Fundamental Research Funds for the Central Universities [WK2480000002, WK2090050045]
- China Postdoctoral Science Foundation [2018M632543]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
In this paper a novel multi-functional composite with high electrical conductivity and excellent magnetic field sensitivity was fabricated by embedding carbon nanotubes (CNTs) and carbonyl iron powders (CIPs) into shear-stiffening gel (STG). Oscillatory shear test demonstrated its excellent rheological properties. When the mass fractions of CNTs and CIPs were 1 wt% and 50 wt%, the increase in storage modulus (G') reached 585% under 100 Hz oscillatory shear and 428% under 1.2 T magnetic flux density with respect to its initial state. The resistivity of this CNT-CIP-STG composite achieved 25 Omega m and showed strong dependence on the magnetic field. When the external magnetic flux density was 873 mT, the normalized electrical resistance response reached up to -40.5%. Linearly increasing and step magnetic field was employed to study the electrical and mechanical behaviors of this CNT-CIP-STG composite. The instantaneous response and time effect were discussed. Interestingly, oscillatory shear showed limited influence on the electrical conductivity but notable enhancement on the sensitivity to magnetic field. A mechanic-electric coupling mechanism was proposed to illustrate enhancement of shear thickening effect and sensibility to magnetic field.
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