Showing papers by "Anji Reddy Polu published in 2023"
TL;DR: In this paper , the in-situ chemical synthesis of silver nanoparticles (AgNPs) with glycerol embedded in polyvinyl alcohol (PVA) to synthesize polymer nanocomposites with different volume percentages of AgNPs (2, 4, and 6) %v/v.
Abstract: This paper presents the in-situ chemical synthesis of silver nanoparticles (AgNPs) with glycerol embedded in poly(vinyl alcohol) (PVA) to synthesize (PVA/AgNPs) polymer nanocomposites with different volume percentages of AgNPs (2, 4, and 6) %v/v. X-ray diffractometer shows the (200) plane of AgNPs, which appeared at 44.82° in PVA/(2, 4, and 6) %v/v AgNPs films. However, the (111), (220), and (311) planes at 2θ (37.55°, 65.08°, and 77.45°) respectively appeared in PVA with 6%v/v AgNPs only. Fourier transform infrared spectroscopy spectrum of AgNPs shows a COC peak at 1273 cm−1 which is attributed to the stronger affinity of AgNPs on the COC bonds in the PVA matrix. The scanning electron microscope confirmed that all nanoparticles are open-spherical or near-spherical in shape. Differential scanning calorimetry shows the decrease in glass transition and melting temperature of pure PVA from 64.62° and 185.54° to 53.09° and 182.35° after the incorporation of AgNPs. Thermogravimetric analysis shows the reduction of thermal stability of PVA/AgNPs films when compared to pure PVA. The electrical conductivity of PVA/AgNPs films increased with the addition of AgNPs. From Mechanical studies, the values of Young's modulus, yield strength, and ultimate tensile strength decreased with increasing AgNPs volume percentage.
1 citations
TL;DR: In this article , the structural and magnetodielectric properties of gadolinium (Gd3+) substituted yttrium iron garnet (Y2GdFe5O12) are investigated.
Abstract: In this study, the structural and magnetodielectric properties of gadolinium (Gd3+) substituted yttrium iron garnet (Y2GdFe5O12) are investigated. The hydrothermal synthesis method is used to prepare the powders. The prepared powders are sintered at three different temperatures. X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) are used to characterize the structural and morphological properties of the sintered samples. The dielectric properties are measured over a frequency range of 100 Hz–1 MHz. A vibration sample magnetometer (VSM) is used to determine the magnetic parameters of the samples and it is observed that the magnetic properties of the samples depend on the sintering temperature. The thermal change in magnetization parameter and the transition temperature of the samples are measured using the pulse magnetometer by applying 5kOe magnetic field. The collected results are analyzed and discussed using various theories.
TL;DR: In this paper , the authors used X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) to characterize the powder particles and compared the dielectric properties of the sintered samples at frequencies ranging from 1 MHz to 1.8 GHz.
Abstract: Ni0.53Cu0.12Zn0.35Fe2O4 ferrite powder is synthesized using the microwave-assisted hydrothermal (M-H) technique. The synthesized powder is characterized using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The morphology of the powder particles is examined using field effective scanning electron microscopy (FESEM). The powder is then sintered using microwave and conventional methods at 910°C/1.5 h and 910°C/4 h, respectively. The grain size, bulk density, d.c. resistivity, and saturation magnetization of both the sintered samples are measured and compared. The dielectric properties of both the sintered samples are measured at frequencies ranging from 1 MHz to 1.8 GHz. The research indicates that the sintering process has an impact on the magnetodielectric performance of ferrites. The change in properties resulting by the sintering method is briefly reviewed.