Measurement of ultrasonic sound velocity in ionic liquids and ionanofluids can give important information about the liquid structure, nanoparticles interactions, effect of water, extent of intermolecular association and the kinetics of molecular processes. Here, the acoustic properties of certain pyridinium-based ionic liquids and their iron oxide-based ionanofluids have been studied using a nanofluid interferometer device. In the ionanofluids, the sound velocity was observed to decrease anisotropically with increase in temperature. The magnetic dipolar interactions among the iron oxide nanoparticles, the nature of IL’s anion and cation as well as sound wave frequency also influenced the sound velocity in the ionanofluid. The effects of sound frequency, temperature and the percentage of water content on the sound velocity in certain pure ionic liquids have also been investigated here.

中文翻译：

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用超声波声速法研究基于氧化铁的离子流体和离子液体

离子液体和离子流体中超声波声速的测量可以提供关于液体结构、纳米粒子相互作用、水的影响、分子间缔合程度和分子过程动力学的重要信息。在这里，使用纳米流体干涉仪装置研究了某些基于吡啶的离子液体及其氧化铁基离子流体的声学特性。在离子流体中，观察到声速随着温度的升高而各向异性地降低。氧化铁纳米颗粒之间的磁偶极相互作用、IL 的阴离子和阳离子的性质以及声波频率也影响了离子流体中的声速。声音频率的影响，