A series of ionic-liquid-based nanofluids (ionanofluids) has been prepared by dispersing different wt % of alumina (Al 2 O 3 ) nanoparticles, covalently tethered with 1-nbutylionic liquid (IL) host. Thermophysical properties of the pure-IL and its nanofluids have been studied using transmission electron microscopy, differential scanning calorimetry (DSC) and vibrational spectroscopy. The tethered nanoadditives are dispersed uniformly within the IL host to form stable nanofluids over the entire range of nanoparticle weight fraction studied. Analysis of the heating rate dependent DSC data illustrates that the phase transition and fragility of the nanofluids can be effectively tuned by varying the content of the [b((MeO) 3 Sip)im][NTf 2 ]-tethered Al 2 O 3 nanoparticles. Moreover, the crystallization and melting transitions of the host can be completely avoided by dispersing merely 10 wt % of the nanoadditives. Analysis of the vibrational spectroscopy data reveals that the guest nanoadditives significantly affect both the relative orientation and the separation of the anion within the host IL through strong intermolecular interactions. The nonisothermal cold crystallization kinetics of the host IL and its nanofluids has been studied using different existing models. The concave downward temperature dependence of the effective activation energy, estimated from the isoconversional analysis of the crystallization data, has been successfully analyzed by standard nucleationbased kinetic model in combination with a power law model. The parameters evaluated from the combined analysis indicate that the tethered nanoparticles within the nanofluids act as heterogeneous nucleation agent, reducing the free energy barrier to nucleation. However, simultaneous large enhancement in diffusion contribution to the nucleation dominates and shifts the process toward higher temperature.

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The dynamic melt crystallization kinetics of polyaniline (PAni)/poly(vinylidene fluoride) (PVDF) blends of different compositions has been investigated to understand the influence of PAni on the heterogeneous nucleation and phase transition of PVDF.

The diffusion constant and other electrical parameters of some LiTFSi salt dissociated PEO based polymer electrolytes has been estimated from the impedance spectroscopy data with reasonable agreement to that obtained from PFG-NMR study.

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