Investigation of Temperature Sensitive Electrical Properties of Manganese-Zinc Ferrites
Effect of TiO2 Modifier Oxide on a B2O3 Glass System
Synthesis, Structural Characterization and DC Conductivity Study of (PMMA+PEG) Polymer Blend Films
Erbium Rare-Earth Metal Schottky Contact to P-Type Si and its Temperature-Dependent Current-Voltage Characteristics
Study of Moderate Temperature Plasma Nitriding of Inconel 601 Alloy
Study of Moderate Temperature Plasma Nitriding of Inconel 601 Alloy
Exact Solution of an Unsteady Buoyancy Force Effects on MHD Free Convective Boundary Layer Flow of Non-Newtonian Jeffrey Fluid
Enhancement of Mechanical Properties with Nano Polymer Composites
Synthesis and Characterization of SnO2 Nanoparticles
Mapping and Forecasting the Land Surface Temperature in Response to the Land Use and Land Cover Changes using Machine Learning Over the Southernmost Municipal Corporation of Tamilnadu, India
In this study, a central-force model was employed to compute the second- and third-order elastic constants for Nickel (Ni) and Titanium (Ti). The interatomic potential was described using the Morse potential, with parameters determined based on the lattice parameter, bulk modulus, and cohesive energy. The cutoff range for the interatomic potential was set at 176 and 168 neighbors for face-centered and body-centered cubic metals, respectively. Utilizing the calculated elastic constants, the pressure derivatives of the second-order elastic constants were further determined. The results exhibited a good agreement with experimental values. However, the comparison between experimental and theoretical values for third-order elastic constants revealed less satisfactory alignment. The theoretical predictions indicated a positive value for C_123 in all face-centered cubic metals and a negative value for body-centered cubic metals. It is noteworthy that the theoretical predictions for C_123 were consistent with a positive value for all fcc metals and a negative value for bcc metals. Contrasting this with the available experimental data on the third-order elastic constants of Ni and Ti, it was observed that C_123 was indeed positive, supporting the theoretical predictions.
Multiferroic BiFeO3 (BFO) and Dy doped Bi1-xDyxFeO3 (BDFO) (where x= 0, 0.05, 0.1, 0.15, 0.2) samples were synthesized by solid state reaction method. The materials were subjected to a comprehensive structural analysis using X-ray Diffraction (XRD) technique, revealing a consistent perovskite structure across all samples. Further insight into the microstructural features and grain formation was obtained through Field Emission Scanning Electron Microscopy (FESEM), providing a detailed characterization of the morphology and structural integrity of the synthesized powders. Additionally, Energy Dispersive X-ray Analysis (EDAX) was employed to confirm the elemental composition of the samples, validating the presence of the Dopant (Dy) and ensuring the homogeneity of the materials. The dopant's influence on the overall elemental makeup was crucial in understanding the potential alterations in the physical properties of the materials. Moreover, the magnetic behavior of the samples was systematically investigated to discern the impact of Dy doping on the magnetic properties. Anomalies in the magnetic behavior were observed, and a comprehensive analysis was conducted to elucidate the underlying mechanisms responsible for these deviations. The findings not only contribute to the understanding of the multifunctional characteristics of these materials but also offer valuable insights for potential applications in the realm of advanced electronic and magnetic devices.
In plasma display panel, the Eu2+ activated Barium Magnesium Aluminate (BAM) phosphor has been conventionally adapted as a blue emitting component in many displays due to its availability and high (>98%) quantum efficiency. BaMgAl10O17:Eu2+ (BAM) phosphor was synthesized in two steps using auto-combustion method followed by sintering in reducing atmosphere. The X-ray diffraction data confirms the high crystallinity and hexagonal structure of BAM nanophosphor, suggesting its potential for optoelectronic devices. Scanning electron microscopy reveals a uniform rectangular morphology, indicating a consistent and controlled synthesis. The study emphasizes the promising applications of BAM nanophosphor, particularly in enhancing color purity for plasma display panel screens, contributing valuable insights to improve nanophosphor performance in electronic displays.
The incorporation of nanoparticles into polymer matrices for the Fabrication of Reinforced Polymer (FRP) materials has garnered considerable attention due to the remarkable enhancements in mechanical and physical properties. The synergy between nanoparticles and polymers results in multifunctional composites, particularly notable for their improved tensile strength, Young's modulus, and bending strength. In this experimental study, three distinct types of nanoparticles, carbon nanotubes, nano silica, and iron oxide are employed as fillers in a polyester resin polymer. The choice of these nanoparticles is driven by their unique properties and potential contributions to the desired enhancements in mechanical performance. The weight percentages of these nanoparticles are systematically varied to investigate the influence of their concentration on the mechanical characteristics of the resulting hybrid FRPs. Carbon nanotubes, known for their exceptional strength and conductivity, contribute to the overall reinforcement of the polymer matrix. Nano silica, with its high surface area and compatibility with polymers, enhances the overall stiffness and strength of the composite. Iron oxide, on the other hand, introduces magnetic properties, which could open avenues for novel applications in sensing or actuation. The experimental methodology involves the careful dispersion of these nanoparticles within the polyester resin matrix, followed by the fabrication of FRP specimens. Comprehensive testing, including tensile, bending, and Young's modulus evaluations, is conducted to assess the impact of varying nanoparticle concentrations on the mechanical properties of the resulting composite materials. The findings from this study aim to provide valuable insights into optimizing the formulation of hybrid FRPs for specific applications that demand superior mechanical performance. The multifunctionality of these composites opens up new possibilities for advanced materials with tailored properties, addressing the evolving needs of various industries.
This paper investigates the thermoacoustic properties of Streptomycin sodium solutions at various concentrations and temperatures. Ultrasonic velocity measurements were employed to examine the physicochemical behavior of the antibiotic in aqueous solutions. The study focuses on understanding molecular interactions by analyzing parameters such as adiabatic compressibility (βa), intermolecular free length (Lf), acoustic impedance (Z), and relative association. The experimental data, obtained using an Ultrasonic Interferometer, was collected at frequencies of 2 MHz and temperatures ranging from 298.13 K to 308.13 K. The results reveal that ultrasonic velocity decreases with increasing concentration but increases with temperature, indicating strong solute-solvent interactions. Adiabatic compressibility increases with concentration but decreases with temperature, suggesting hydrogen bonding formation. Intermolecular free length supports the conclusion that Streptomycin acts as a structure maker. The findings contribute to the understanding of molecular interactions in Streptomycin solutions and provide valuable insights for pharmaceutical and medical applications.
Silicon Carbide (SiC) boasts impressive thermo-mechanical properties and exceptional resistance to high temperatures, making it a promising candidate for enhancing electric energy production efficiency. This research focuses on the sol-gel synthesis of silicon carbide (SiC) nanopowder for high-temperature environments, particularly solar receptors. The SiO2:Mg mixture, heated at 650°C for 6 hours, undergoes acid etching and subsequent washing to produce SiC. Characterization involves X-ray Powder Diffraction (XRD), Fourier-Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM). XRD confirms SiC formation, with an estimated particle size of ~30 nm. Ultrasonic velocity measurements reveal a non-linear relationship with molar concentration, suggesting strong interactions. The ultrasonic velocity increases with nanoparticle concentration but decreases with temperature due to Brownian motion. Density increases with molar concentration, indicating close packing in the nanosuspension. The study emphasizes the role of aggregation in nanocolloids and its impact on ultrasonic velocity enhancement.
