Abstract
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.
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