Abstract Ionic liquids, as well as their suspensions with nanoparticles, can be considered as the future of solar applications, due to their unique properties. This work consists of an experimental study of 1-ethyl-3-methylimidazolium methanesulfonate ([C2mim][CH3SO3]) ionic liquid and its ionanofluids with Al2O3 nanoparticles of different mass concentrations (i.e. 0.05–10 %wt.). Viscosity, specific heat and electrical conductivity are measured in the temperature range 283.15–333 K and the experimental data were discussed in terms of both nanoparticle concentration and temperature variation. Results showed that the viscosity is increasing when nanoparticles mass concentration increase, going up to 250% for the ionanofluid with 10 %wt. of alumina suspended in the ionic liquid. Ionanofluids rheological tests and viscosity variation were debated in the article and the results were correlated using the Vogel-Fulcher-Tammann approach. Specific heat was found to increase with both mass fraction and temperature. Electrical conductivity decrease with nanoparticle addition and increase linearly with temperature growth. Concluding, these new fluids can be seen as an alternative for high temperature heat transfer fluids used in solar applications.

中文翻译：

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[C2mim][CH3SO3]离子液体和氧化铝纳米粒子的离子流体：粘度、比热和电导率的实验研究

摘要 离子液体及其与纳米粒子的悬浮液由于其独特的性质，可被视为太阳能应用的未来。这项工作包括对 1-乙基-3-甲基咪唑鎓甲磺酸盐 ([C2mim][CH3SO3]) 离子液体及其具有不同质量浓度（即 0.05-10%wt.）的 Al2O3 纳米颗粒的离子流体的实验研究。在 283.15-333 K 的温度范围内测量粘度、比热和电导率，并根据纳米颗粒浓度和温度变化对实验数据进行了讨论。结果表明，当纳米颗粒质量浓度增加时，粘度增加，对于 10%wt 的离子纳米流体，粘度上升至 250%。氧化铝悬浮在离子液体中。文章中讨论了离子流体流变测试和粘度变化，并使用 Vogel-Fulcher-Tammann 方法将结果关联起来。发现比热随着质量分数和温度的增加而增加。电导率随着纳米颗粒的加入而降低，并随着温度的增长而线性增加。最后，这些新流体可被视为太阳能应用中使用的高温传热流体的替代品。