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<p>This study elucidates the synthesis of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles via a sol–gel method using gelatin fuel and explores their incorporation into low-density polyethylene (LDPE) at varying weight percentages (0.0 wt&#xa0;% to 7.0 wt&#xa0;%). Systematic characterization was completed using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and dielectric measurements. XRD patterns of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles exhibited diffraction peaks corresponding to the spinel structure. The average crystal size of CoFe<sub>2</sub>O<sub>4</sub> in LDPE nanocomposites was 16–24&#xa0;nm (Scherrer equation) and 15–55&#xa0;nm (Williamson-Hall method). TEM analysis estimated the mean size of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles to be 17&#xa0;nm. SEM images revealed nanoparticle-polymer interactions, particle distribution, and agglomeration at higher concentrations. TGA results indicated a marked increase in the decomposition temperature of LDPE composites. DSC analysis further demonstrates enhanced melting temperature (108–111&#xa0;°C). The real part of the dielectric constant (ε<sub>1</sub>)&#xa0;decreased up to 3 wt&#xa0;% of&#xa0;CoFe<sub>2</sub>O<sub>4</sub> and then increased. The imaginary part of the dielectric permittivity (ε<sub>2</sub>) increased with higher CoFe<sub>2</sub>O<sub>4</sub> nanoparticle content. The resulting materials exhibit promising applications in electronics, energy storage, and electromagnetic shielding.</p>

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Structure, thermal and dielectric studies of low-density polyethylene/cobalt ferrite hybrid nanocomposites

  • 期刊论文

  • 发表日期：

    2025年3月22日

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  • Taha Abdel Mohaymen Taha,
  • Akram S. Sharaf,
  • S. El-Rabaie,
  • A. Hassona

摘要

This study elucidates the synthesis of CoFe2O4 nanoparticles via a sol–gel method using gelatin fuel and explores their incorporation into low-density polyethylene (LDPE) at varying weight percentages (0.0 wt % to 7.0 wt %). Systematic characterization was completed using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and dielectric measurements. XRD patterns of CoFe2O4 nanoparticles exhibited diffraction peaks corresponding to the spinel structure. The average crystal size of CoFe2O4 in LDPE nanocomposites was 16–24 nm (Scherrer equation) and 15–55 nm (Williamson-Hall method). TEM analysis estimated the mean size of CoFe2O4 nanoparticles to be 17 nm. SEM images revealed nanoparticle-polymer interactions, particle distribution, and agglomeration at higher concentrations. TGA results indicated a marked increase in the decomposition temperature of LDPE composites. DSC analysis further demonstrates enhanced melting temperature (108–111 °C). The real part of the dielectric constant (ε1) decreased up to 3 wt % of CoFe2O4 and then increased. The imaginary part of the dielectric permittivity (ε2) increased with higher CoFe2O4 nanoparticle content. The resulting materials exhibit promising applications in electronics, energy storage, and electromagnetic shielding.