Huang Zhengyong, Wang Feipeng, Wang Qiang, Yao Wei, Sun Kai, Zhang Ruiqi, Zhao Jianying, Lou Ziyi, Li Jian
State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing 400044, China.
Postdoctoral Research Station on Chemical Engineering and Technology, Chongqing University, Chongqing 400040, China.
Nanomaterials (Basel). 2019 Jul 9;9(7):989. doi: 10.3390/nano9070989.
The eco-friendly vegetable liquid is increasingly used because of the growing demand for environmentally friendly dielectric liquid. A vegetable liquid/fullerene nanofluid was fabricated via ultrasonic processing with good dispersion of the fullerene nanoparticles. It was observed that a small amount of fullerene (~100 mg/L) can significantly improve the electrical properties of vegetable insulating liquid (dissipation factor decreased by 20.1%, volume resistivity increased by 23.3%, and Alternating Current (AC) dielectric breakdown strength increased by 8.6%). Meanwhile, the trace amount of fullerene is also able to improve the electrical performances (i.e., dissipation factor and electrical resistivity) of the vegetable nanofluid under harsh conditions of long-term thermal aging compared with the blank contrast. The reduced acid values (25%) and dissolved decomposition gases (58.2% for hydrogen) in the aged vegetable nanofluid indicate the inhibition of molecule decomposition of vegetable liquid with fullerene. The improved electrical performances and thermal resistance of the vegetable nanofluid contribute to the electron affinity of fullerene proved by calculation of electron density distribution on the surface. The thermogravimetric analysis of the nanofluid under different atmospheres interprets that the oxygen absorbed inevitably in the fullerene contributes to the performance deterioration of the nanofluids during the initial aging. This work provides a potential method towards eco-friendly dielectric liquid with great electrical performances for harsh environments.
由于对环保型介电液体的需求不断增长，这种生态友好型蔬菜液体的使用越来越广泛。通过超声处理制备了一种蔬菜液体/富勒烯纳米流体，富勒烯纳米颗粒具有良好的分散性。据观察，少量的富勒烯（约100 mg/L）可显著改善蔬菜绝缘液体的电性能（损耗因数降低20.1%，体积电阻率提高23.3%，交流介电击穿强度提高8.6%）。同时，与空白对照相比，痕量富勒烯在长期热老化的苛刻条件下也能够改善蔬菜纳米流体的电性能（即损耗因数和电阻率）。老化蔬菜纳米流体中酸值降低（25%）以及溶解分解气体减少（氢气减少58.2%）表明富勒烯对蔬菜液体分子分解有抑制作用。蔬菜纳米流体电性能和热稳定性的提高归因于通过表面电子密度分布计算所证明的富勒烯的电子亲和力。纳米流体在不同气氛下的热重分析表明，富勒烯中不可避免吸收的氧气导致纳米流体在初始老化过程中性能恶化。这项工作为在恶劣环境下具有优异电性能的环保型介电液体提供了一种潜在方法。
