The effect of mechanical stirring on sol-gel synthesis of thorn-like ZnO nanoparticles (ZnO-NPs) ... more The effect of mechanical stirring on sol-gel synthesis of thorn-like ZnO nanoparticles (ZnO-NPs) and antimicrobial activities is successfully reported in this study. The in-house synthesized nanoparticles were characterized by XRD, SEM, TEM, FTIR, TGA, DSC and UV-visible spectroscopy. The X-Ray Diffraction analysis revealed the wurtzite crystal lattice for ZnO-NPs with no impurities present. The diametric measurements of the synthesized thorn-like ZnO-NPs (morphology assessed by SEM) were well accounted to be less than 50 nm with the help of TEM. Relative decrease in aspect ratio was observed on increasing the agitation speed. The UV-visible spectroscopy showed the absorption peaks of the ZnO-NPs existed in both UVA and UVB region. A hypsochromic shift in λmax was observed when stirring pace was increased from 500 rpm to 2000 rpm. The FTIR spectroscopy showed the absorption bands of the stretching modes of Zn-O between 500 cm−1 to 525 cm−1. The Thermal analysis studies revealed bett...
A theoretical model has been presented for the measurement of heat transfer characteristics of a ... more A theoretical model has been presented for the measurement of heat transfer characteristics of a spiral coil heat exchanger under wet conditions. The solution is obtained using Ms Excel and the simulated results have been compared with the experimental data reported in open literature. It has been found that there is a good agreement between the simulated and experimental values. It is also observed that air mass flow rate and inlet air temperature have significant effect on the increase of the outlet water temperatures. Further outlet air and water temperature decreases with increasing water mass flow rate
The effect of mechanical stirring on sol-gel synthesis of thorn-like ZnO nanoparticles (ZnO-NPs) ... more The effect of mechanical stirring on sol-gel synthesis of thorn-like ZnO nanoparticles (ZnO-NPs) and antimicrobial activities is successfully reported in this study. The in-house synthesized nanoparticles were characterized by XRD, SEM, TEM, FTIR, TGA, DSC and UV-visible spectroscopy. The X-Ray Diffraction analysis revealed the wurtzite crystal lattice for ZnO-NPs with no impurities present. The diametric measurements of the synthesized thorn-like ZnO-NPs (morphology assessed by SEM) were well accounted to be less than 50 nm with the help of TEM. Relative decrease in aspect ratio was observed on increasing the agitation speed. The UV-visible spectroscopy showed the absorption peaks of the ZnO-NPs existed in both UVA and UVB region. A hypsochromic shift in λmax was observed when stirring pace was increased from 500 rpm to 2000 rpm. The FTIR spectroscopy showed the absorption bands of the stretching modes of Zn-O between 500 cm−1 to 525 cm−1. The Thermal analysis studies revealed bett...
A theoretical model has been presented for the measurement of heat transfer characteristics of a ... more A theoretical model has been presented for the measurement of heat transfer characteristics of a spiral coil heat exchanger under wet conditions. The solution is obtained using Ms Excel and the simulated results have been compared with the experimental data reported in open literature. It has been found that there is a good agreement between the simulated and experimental values. It is also observed that air mass flow rate and inlet air temperature have significant effect on the increase of the outlet water temperatures. Further outlet air and water temperature decreases with increasing water mass flow rate
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