期刊
MATERIALS RESEARCH BULLETIN
卷 116, 期 -, 页码 22-31出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2019.03.028
关键词
Imidazolium ionic liquid; Nanofluids; Ion conductivity; Viscosity; Decoupling in the charge transport
资金
- Council of Scientific and Industrial Research (Govt. of India) under the Extra Mural Research Scheme [03(1327)/14/EMR-II]
- DST-PURSE-II grant of the University of Kalyani
The mechanism of charge transport in ionic liquid functionalized ZnS nanoparticles dispersed imidazolium-based ionanofluids are investigated combining impedance spectroscopy, viscosity measurement and diff;erential scanning calorimetry. The viscosity enhances from 76 mPa S to 229 mPa S at room temperature in 0-20 wt% of functionalised nanoparticles addition in the ionic liquid. The conductivity and permittivity spectra are dominated on the low-frequency side by electrode polarization effects. Using the Poisson-Nernst-Planck (PNP) electro-diffusion equations enables us to determine the dc conductivity, ion diffusivity and hopping length of mobile ions and their nature of thermal activation. A decoupling of ion transport with viscosity is observed in the ionanofluids within the entire temperature range and for the 15.0 wt% nanoparticle inserted nanofluid conductivity reaches a maximum value (2.5 mS/cm at 30 degrees C). The physical explanation regarding the possible origin of the observed remarkable decoupling is proposed.
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