Abstract
In this work, nanocomposite films of chitosan containing maghemite nanoparticles and LiClO4 were prepared by using solution casting method. Various characterization techniques such as X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy (FESEM), vibrating sample magnetometer (VSM) and broadband dielectric spectrometry (BDS) were used to analyze the structural, magnetic and electric properties of the synthesized samples. XRD and FTIR measurements showed that LiClO4 and maghemite nanoparticles (γ-Fe2O3) got incorporated into the chitosan matrix. FE-SEM analysis revealed that the incorporation of maghemite nanoparticles affects the morphology of lithium salt crystals. Polymer microspheres of size ~1 μm were observed when chitosan-10 % maghemite contained 25 % LiClO4. When LiClO4 content was increased from 25 to 50 %, Lithium rods were observed instead of polymer microspheres. The electric and dielectric properties of the polymer nanocomposites (PNC) were studied using BDS at room temperature. The result showed that the electric and dielectric properties of the chitosan were greatly modified depending upon the γ-Fe2O3 and LiClO4 concentrations. Room temperature magnetic measurements showed that the nanocomposites are superparamagnetic. A model is proposed to explain the observed electrical properties of these new conducting magnetic nanocomposites.
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The research was made possible due to funding provided by BOARD OF RESEARCH IN NUCLEAR SCIENCES (BRNS) India Sanction No 2011/37C/21/BRNS.
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Saravanan, A., Ramasamy, R.P. Chitosan-maghemite-LiClO4 – a new green conducting superpara magnetic nanocomposite. J Polym Res 23, 174 (2016). https://doi.org/10.1007/s10965-016-1072-8
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DOI: https://doi.org/10.1007/s10965-016-1072-8