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Moumita Khutia

Bio: Moumita Khutia is an academic researcher from VIT University. The author has contributed to research in topics: Dielectric & Differential scanning calorimetry. The author has an hindex of 6, co-authored 13 publications receiving 97 citations.

Papers
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Journal ArticleDOI
30 Mar 2014-Ionics
TL;DR: In this article, a modified PVDF/PVA polymer system as a function of Nafion was detected by X-ray diffraction (XRD) and the major change in Fourier transform infrared (FTIR) spectroscopy confirms the chemical bond C=O stretching around 1,700 cm−1 due to Nafions.
Abstract: Polyvinylidene fluoride (PVDF) and polyvinyl alcohol (PVA) composites were prepared by controlled loading of Nafion (5 to 15 wt%) by solution casting using water and dimethylformamide (DMF) as a solvent. The surface morphology of composite analyzed by atomic force microscopy (AFM) reveals the presence of Nafion ionomers. The increase in interlayer spacing of modified PVDF/PVA polymer system as a function of Nafion was detected by X-ray diffraction (XRD). The major change in Fourier transform infrared (FTIR) spectroscopy confirms the chemical bond C=O stretching around 1,700 cm−1 due to Nafion. Differential scanning calorimetry (DSC) demonstrates the thermal stability of polymer composites and the decrease in melting temperature (T m). The optimized AC conductivity (σ) of the prepared composite was evaluated by using an impedance analyzer as a function of temperature (40 to 150 °C) at constant 30-MHz frequency. The highest conductivity of 1.3 × 10−2 S m−1 was observed at 80 °C for 10 wt% of Nafion and correlated with structure, morphology and thermal properties of modified PVDF/PVA/Nafion composites. The experimental results may be useful for sensors, fuel cells and battery application domains.

31 citations

Journal ArticleDOI
TL;DR: In this article, a poly vinyl chloride (PVC)/poly-methyl methacrylate (PMMA) blend with loading of Nickel oxide (NiO) by solution cast technique is presented.
Abstract: We have prepared poly vinyl chloride (PVC)/poly-methyl methacrylate (PMMA) blend with loading of Nickel oxide (NiO) by solution cast technique. X-ray diffraction reveals the interaction between NiO, PVC and PMMA in the blend form. The weak interaction between PVC, PMMA and NiO was confirmed by Fourier transform infrared spectroscopy. The miscibility of PVC and PMMA has been confirmed by differential scanning calorimetry. The results demonstrate that the 2 wt% NiO loaded PVC/PMMA blend exhibits lowest crystallinity which leads to better NiO dispersion, also observed by atomic force microscopy and scanning electron microscopy. The performance of electrical properties were evaluated under wide band of frequency (10–107 Hz) as a function of DC bias voltage (0–25 V). The dielectric property was characterized via electrical modulus formalism. The present blend systems show good dielectric property as well as considerable conductivity which differs by frequency and DC bias. The variation of AC conductivity as a function of frequency and DC bias shows plateau shape at higher frequency which obeys Jonscher’s power law. It demonstrates that the AC electrical conductivity is directly proportional to the applied DC bias potential. It may be developed for electrolyte application.

25 citations

Journal ArticleDOI
TL;DR: In this paper, a modified binary polymer blend made up of polycarbonate and polystyrene blend has been prepared by loading of aluminum oxide (Al2O3) as a dopant.
Abstract: In this study, a modified binary polymer blend made up of polycarbonate and polystyrene blend has been prepared by loading of aluminum oxide (Al2O3) as a dopant. The role of alumina with polymer blend system was addressed in view of interfacing criteria. The filler concentration of modified blend was taken as 5, 10, and 15%. The morphological, thermal, and electrical properties were characterized by various techniques. Optical microscopy confirms the homogenous dispersion of Al2O3 in blend. The presence of alumina was detected by subatomic level using atomic force microscope (both two and three dimensional approach). The differential scanning calorimetric thermographs demonstrate decreasing softing point as function of alumina loading. The dielectric properties such as dielectric constant, loss, and electrical modulus were studied under DC bias. The effect of DC bias exhibits significant changes at low amount of Al2O3. The dielectric polarization supports Maxwell Wagner (MW) theory due to low frequency re...

22 citations

Journal ArticleDOI
TL;DR: In this article, a polycarbonate (PC)/polystyrene (PS) blend was modified by loading alumina (Al2O3) into the blend, which showed a significant effect in resulting in a high dielectric constant with low Dielectric loss and dissipation factor.
Abstract: We modified a polycarbonate (PC)/polystyrene (PS) blend by loading alumina (Al2O3) into the blend. X-ray diffraction (XRD) shows a decrease in crystallinity. The optical microscopy and atomic force microscopy (AFM) confirms the homogeneous dispersion of alumina. The differential scanning calorimetry (DSC) data shows improved results in glass transition (Tg) and melting temperature (Tm) of blend systems. The electrical properties of polymer blends modified by Al2O3 were studied as a function of frequency (50 Hz–35 MHz) at 323 K. The alumina showed a significant effect in resulting in a high dielectric constant with low dielectric loss and dissipation factor.

21 citations

Journal ArticleDOI
TL;DR: In this paper, the authors demonstrated the modification of Isophthalic polyester (IP) resin/styrene in situ blends by dispersion of nano perovskite strontium titanate nanoparticles (STONP).
Abstract: We demonstrated the modification of Isophthalic polyester (IP) resin/styrene in situ blends by dispersion of nano perovskite strontium titanate nanoparticles (STONP). The thermal stability of prepared sample was examined by differential scanning calorimetry. The variation of glass transition temperature of IP resin on styrene and filler content reflects the elastic network of the polymer chain, miscibility of polystyrene and IP resin and phase separation between filler and polymer matrix. The phase separation and morphology of the blend was confirmed by scanning electron microscope and energy dispersive X-ray spectroscopy as a function of STONP loading. The dielectric property of IP resin/styrene/STONP was analyzed as a function of frequency (50 Hz–10 MHz) and temperature (40–150 °C). Two relaxation process was clearly identified namely Maxwell–Wagner–Siller effect corresponds to low frequency polarization and α-relaxation corresponds to glass transition effect followed by Vogel–Fulcher–Tamman equation (VTF equation). We disclosed the improvement of dielectric properties as a function of STONP loading. This investigation is highly useful in the electronics domain.

8 citations


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Journal ArticleDOI
15 Dec 2020-Fuel
TL;DR: In this article, a review article describing all possible directions related to such typical natural resources and application of their carbon derivatives/products for better electrochemical properties is presented, which will be very helpful for future research work in the field of carbon electrode materials derived from coal, graphite, and biomass.

170 citations

Journal ArticleDOI
TL;DR: In this paper, the properties of polyvinyl alcohol (PVA) and poly(vinyl pyrrolidone) (PVP) with zinc oxide (ZnO) nanoparticles were investigated.

118 citations

Journal ArticleDOI
TL;DR: A zeolitic imidazolate framework-8/polypropylene-polycarbonate bark-like meltblown fibrous membrane (PPC/ZIF-8) was designed through meltblown and in-situ growth method, achieved efficient PM2.5 capture and great filtration stability under harsh environment.
Abstract: Environmental pollution, especially air pollution, seriously endangers public health globally. Due to severe air pollution, air filters still face many challenges, especially in terms of filtration...

89 citations

Journal ArticleDOI
TL;DR: In this article, a comprehensive review of the state-of-the-art solid-state electrolytes for alkali ion batteries is presented, which can give a clear figure of the current state of the art and the development trend of future solid state electrolytes.
Abstract: Solid-state electrolytes have a lot of advantages, including the inhibition of alkali metal dendrite growth, the elimination of liquid electrolyte leakage, the improvement of safety, the enhancement of energy density and power density, and the potential application in flexible electronics. Therefore, solid-state electrolytes have become one of the hottest topics in energy-storage research area. An up-to-date review on solid-state electrolytes is of not only scientific significance but also technological imperative. Here, recent progress in solid-state electrolytes for alkali ion batteries is summarized. Through this comprehensive review and the comparison of different solid-state electrolytes, we hope it can give a clear figure of the state-of-art status and the development trend of the future solid-state electrolytes.

76 citations