Abstract: The structural properties of nanomaterials play a crucial role in determining their performance in various applications. This study investigates the effect of pH variation on the structural properties of ZnS nanocrystals synthesized via low-temperature chemical deposition. ZnS nanoparticles were prepared in a polyvinyl alcohol (PVA) host matrix, with pH values ranging from 2.2 to 2.8. X-ray diffraction (XRD) analyses reveal that an increase in pH enhances crystallinity, resulting in narrower peaks and larger grain sizes. The average grain sizes of the films with varying pH values are found to range from 4.63 nm to 6.37 nm. The lattice constant evaluated using Nelson Reiley plot (N-R plot) ranges from 5.363 Å to 5.420 Å (pH 2.2-2.8), which slightly deviates from the standard 5.406 Å, suggesting compressive strain in the films, possibly due to sulfur deficiency. It was also observed that as pH decreases, there is an increase in microstrain and dislocation density probably due to lattice contraction. Results from the Williamson-Hall analysis confirm these trends, showing reductions in both average grain size and lattice strain at lower pH. These findings highlight the critical role of pH in controlling the structural characteristics of ZnS thin films, providing insights for optimizing ZnS properties for specific technological applications.
Abstract: The structural properties of nanomaterials play a crucial role in determining their performance in various applications. This study investigates the effect of pH variation on the structural properties of ZnS nanocrystals synthesized via low-temperature chemical deposition. ZnS nanoparticles were prepared in a polyvinyl alcohol (PVA) host matrix, wi...Show More
Abstract: Binary blends of 5%, 10% and 20% biodiesel (Bd) derived from unconventional vegetable oil of Chrysophyllum albidum with pure diesel (Dp) were investigated in this study. The density of the binary blends was evaluated at pressures up to 40MPa and varying the temperature from 293.15K to 353.15K. Similarly, the kinematic viscosity of the samples was measured and presented in this work at atmospheric pressure in a temperature range from 293.15K to 373.15K. The density values were adjusted from the modified Tait-like equation with mean absolute deviations of about 0.005%. Density values were used to estimate the isothermal compressibility coefficient of the blends of biodiesel (Bd) with pure diesel (Dp). The density and kinematic viscosity of ethyl biodiesel are higher than those of the Bd/Dp blends and decrease with increasing temperature. The density and kinematic viscosity of the blends decrease with the proportion or amount of biodiesel in the Bd/Dp blends in the order B5 < B10 < B20. The isothermal compressibility of the samples increases with increasing temperature at constant pressure and decreases with increasing pressure along the isotherm. The absolute mean deviations between the measured densities and those calculated using the Tait-Like equation for our examined samples at around 0.005% confirm the accuracy of the modeling and the reliability of the calculated isothermal compressibility coefficient values.Abstract: Binary blends of 5%, 10% and 20% biodiesel (Bd) derived from unconventional vegetable oil of Chrysophyllum albidum with pure diesel (Dp) were investigated in this study. The density of the binary blends was evaluated at pressures up to 40MPa and varying the temperature from 293.15K to 353.15K. Similarly, the kinematic viscosity of the samples was m...Show More