Abstract
A series of ionic-liquid-based nanofluids (ionanofluids) has been prepared by dispersing different wt % of alumina (Al2O3) nanoparticles, covalently tethered with 1-n-butyl-3-(3-(trimethoxysilyl)propyl)imidazolium bis(trifluoromethanesulfonyl)imide [b((MeO)3Sip)im][NTf2], in 1-decyl-3-ethylimidazolium bis(trifluoromethanesulfonyl)imide [Deim][NTf2] ionic 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)3Sip)im][NTf2]-tethered Al2O3 nanoparticles. Moreover, the crystallization and melting transitions of the host can be...
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