郝春成

教授

教授 博士生导师 硕士生导师

职务:先进电工材料研究院院长

学历:博士研究生

主要任职:高压绝缘系统与先进电工材料山东省工程研究中心 主任

其他任职:山东省电工技术学会高压绝缘与电工材料专委会主任委员

论文成果

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Enhanced Electrorheological Performance of Nb-Doped TiO2 Microspheres Based Suspensions and Their Behavior Characteristics in Low-Frequency Dielectric Spectroscopy

发布时间:2023-10-19 点击次数:

关键字:electrorheological response; Nb-doped; low-frequency dielectric spectroscopy; secondary polarization; TiO2 microspheres
摘要:Titanium dioxide and Nb-doped titanium dioxide microspheres with the same size were fabricated by a simple sol gel method, and the formation mechanism of Nb-doped titanium dioxide microspheres was proposed. Titanium dioxide and Nb-doped titanium dioxide microspheres were adopted as dispersed materials for electrorheological (ER) fluids to investigate the influence of the charge increase introduced by Nb doping on the ER activity. The results showed that Nb doping could effectively enhance the ER performance. Combining with the analysis of dielectric spectroscopy, it was found that the interface polarization of Nb-doped TiO2 ER fluid was larger than that of TiO2 ER fluid, which might be caused by more surface charges in Nb-TiO, microspheres due to Nb5+ doping and resulting in enhancement of electric field force and strengthening of fibrous structure. In addition, by comparing and analyzing the permittivity curves of Nb-TiO2/LDPE solid composite and Nb-TiO2/silicone-oil fluid composite, it could be concluded that the enhancement of permittivity at low frequency resulted from the increase of the order degree of dispersed particles in ER fluid rather than from the quasi-dc (QDC) behavior. Moreover, the absolute value of slope of permittivity curves (K) at 0.01 Hz could be utilized as the standard for judging the ability to maintain the chainlike structure. The relationships between polarizability of dispersed particles, dielectric spectrum, parameter K, and ER properties were discussed in detail.
卷号:7
期号:48
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