Browsing by Author "Sadiq M."

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    Dielectric relaxation and AC conductivity of TiO2 nanofiller dispersed polymer nanocomposite
    (American Institute of Physics Inc., 2019) Arya A.; Sadiq M.; Sharma A.L.
    The Lithium-ion conducting polymer nanocomposite (PNC) has been synthesized by the standard solution cast technique in the skeleton of PEO-PVC blend with a different content of Titanium oxide (TiO2) as nanofiller. The lithium hexafluorophosphate (LiPF6) was used as the salt. The dielectric strength decreases with frequency and is attributed to the dominance of the electrode polarization effect. The highest dielectric strength and lowest relaxation time (1.88 ns) were achieved for the 15 wt. % TiO2 (PPS15T) PNCs when compared to other concentrations. The PPS15T exhibits the highest dc conductivity 2.34×10−5 S cm−1 at RT. The dielectric strength (Δε) and relaxation time (τε′) were in good agreement with the dc conductivity (σdc). An interaction scheme has also been proposed to highlight the interactions between the polymer, salt and nanofiller in most visual manner.
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    Structural, electrical and ion transport properties of free-standing blended solid polymeric thin films
    (Springer Verlag, 2019) Arya A.; Sadiq M.; Sharma A.L.
    Blended solid polymeric thin films based on PEO–PVP complexed with LiBOB were synthesized by solution cast technique. The effect of salt on morphology, structure and electrochemical properties was examined. The XRD and FESEM analyses reveal the enhancement of amorphous content on salt addition. The FTIR spectroscopy evidences the complex formation and presence of various microscopic interactions. The ionic conductivity for the optimized system has been estimated and found to be two orders higher than the salt-free system, i.e., ~ 5.1 × 10−6 S cm−1 (@40 °C), and remains increasing with temperature i.e. 6.5 × 10−4 S cm−1 (@100 °C) for O/Li = 16. The enhancement of ionic conductivity is attributed to increase in the number density of mobile ions as concluded by the Rice and Roth model. The high tion (~ 0.99) evidences the ionic nature of complexed electrolyte. DSC analysis evidences the suppression of crystallinity and shift of glass transition and melting temperature toward lower temperature implies the enhancement of the amorphous content and forms the rubbery nature of the thin films which support the faster ion conductions. Finally, an interaction scheme is proposed for a better explanation of the ion transport on the basis of experimental findings.