Zinc oxide(ZnO) nanoparticles of varying sizes(20, 44 and 73 nm) have been successfully synthesized by a hybrid electrochemical-thermal method using aqueous sodium bicarbonate electrolyte and sacrificial Zn anode and ...Zinc oxide(ZnO) nanoparticles of varying sizes(20, 44 and 73 nm) have been successfully synthesized by a hybrid electrochemical-thermal method using aqueous sodium bicarbonate electrolyte and sacrificial Zn anode and cathode in an undivided cell under galvanostatic mode at room temperature. The as-synthesized product was characterized by X-ray diffraction(XRD), X-ray photoelectron spectra(XPS), Scanning electron microscopy along with Energy dispersive analysis of X-ray(SEM/EDAX), Transmission electron microscopy(TEM), Ultra Violet- Diffuse reflectance spectroscopic methods(UV-DRS). and UV-DRS spectral methods.The as-synthesized compound were single-crystalline and Rietveld refinement of calcined samples exhibited hexagonal(Wurtzite) structure with space group of P63mc(No.186). The band gaps for synthesized ZnO nanoparticles were 3.07, 3.12 and 3.13 e V, respectively, based on the results of diffuse reflectance spectra(DRS). The electrochemically synthesized ZnO powder was used as photocatalysts for UV-induced degradation of Methylene blue(MB). Photodegradation was also found to be function of exposure time and dye solution p H. It has been found that as-synthesized powder has excellent photocatalytic activity with 92% degradation of MB, indicating ZnO nanoparticles can play an important role as a semiconductor photocatalyst.展开更多
Recent developments in the exploration of the universe suggest that it is in an accelerated phase of ex-pansion.Accordingly,our study aims to probe the current scenario of the universe with the aid of the reconstructi...Recent developments in the exploration of the universe suggest that it is in an accelerated phase of ex-pansion.Accordingly,our study aims to probe the current scenario of the universe with the aid of the reconstruction technique.The primary factor that describes cosmic evolution is the deceleration parameter.Here,we provide a physically plausible,newly defined model-independent parametric form of the deceleration parameter.Further,we constrain the free parameters through statistical MCMC analysis for different datasets,including the most recent Pantheon+.With the statistically obtained results,we analyze the dynamics of the model through the phase trans-ition,EoS parameter,and energy conditions.Also,we make use of the tool Om diagnostic to test our model.展开更多
The corrosion inhibition efficiencies of four compounds namely N-[（1E）-（2-chloroquinolin-3-yl）methylene]-N-phenylamine（CQMA）,N-（1E）-（2-chloroquinolin-3-yl）methylene]-N-（4-fluorophenyl）amine（CQMFA）,N-（4-...The corrosion inhibition efficiencies of four compounds namely N-[（1E）-（2-chloroquinolin-3-yl）methylene]-N-phenylamine（CQMA）,N-（1E）-（2-chloroquinolin-3-yl）methylene]-N-（4-fluorophenyl）amine（CQMFA）,N-（4-chloro phenyl）-N-[（1E）-（2-chloroquinolin-3-yl）methylene]amine（CQMCA）,and N-（4-bromo phenyl）-N-[（1E）-（2-chloroquinolin-3-yl）methylene]amine（CQMBA）on mild steel corrosion in hydrochloric acid media were investigated using mass loss,potentiodynamic polarization and electrochemical impedance spectroscopy.For all the studied inhibitors the inhibition efficiency values were found to increase with increasing concentration up to 5.00×10-4 mol·dm-3.Scanning electron microscopic technique showed the formation of a thick film on the steel surface in the presence of inhibitors.展开更多
基金CSIR, New-Delhi for SRF [Sanction No. 09/908(0002) 2K9-EMR-I]DST [No. S.R/S3/ME/014/2007]Government of India (GOI) for research grant
文摘Zinc oxide(ZnO) nanoparticles of varying sizes(20, 44 and 73 nm) have been successfully synthesized by a hybrid electrochemical-thermal method using aqueous sodium bicarbonate electrolyte and sacrificial Zn anode and cathode in an undivided cell under galvanostatic mode at room temperature. The as-synthesized product was characterized by X-ray diffraction(XRD), X-ray photoelectron spectra(XPS), Scanning electron microscopy along with Energy dispersive analysis of X-ray(SEM/EDAX), Transmission electron microscopy(TEM), Ultra Violet- Diffuse reflectance spectroscopic methods(UV-DRS). and UV-DRS spectral methods.The as-synthesized compound were single-crystalline and Rietveld refinement of calcined samples exhibited hexagonal(Wurtzite) structure with space group of P63mc(No.186). The band gaps for synthesized ZnO nanoparticles were 3.07, 3.12 and 3.13 e V, respectively, based on the results of diffuse reflectance spectra(DRS). The electrochemically synthesized ZnO powder was used as photocatalysts for UV-induced degradation of Methylene blue(MB). Photodegradation was also found to be function of exposure time and dye solution p H. It has been found that as-synthesized powder has excellent photocatalytic activity with 92% degradation of MB, indicating ZnO nanoparticles can play an important role as a semiconductor photocatalyst.
文摘Recent developments in the exploration of the universe suggest that it is in an accelerated phase of ex-pansion.Accordingly,our study aims to probe the current scenario of the universe with the aid of the reconstruction technique.The primary factor that describes cosmic evolution is the deceleration parameter.Here,we provide a physically plausible,newly defined model-independent parametric form of the deceleration parameter.Further,we constrain the free parameters through statistical MCMC analysis for different datasets,including the most recent Pantheon+.With the statistically obtained results,we analyze the dynamics of the model through the phase trans-ition,EoS parameter,and energy conditions.Also,we make use of the tool Om diagnostic to test our model.
文摘The corrosion inhibition efficiencies of four compounds namely N-[（1E）-（2-chloroquinolin-3-yl）methylene]-N-phenylamine（CQMA）,N-（1E）-（2-chloroquinolin-3-yl）methylene]-N-（4-fluorophenyl）amine（CQMFA）,N-（4-chloro phenyl）-N-[（1E）-（2-chloroquinolin-3-yl）methylene]amine（CQMCA）,and N-（4-bromo phenyl）-N-[（1E）-（2-chloroquinolin-3-yl）methylene]amine（CQMBA）on mild steel corrosion in hydrochloric acid media were investigated using mass loss,potentiodynamic polarization and electrochemical impedance spectroscopy.For all the studied inhibitors the inhibition efficiency values were found to increase with increasing concentration up to 5.00×10-4 mol·dm-3.Scanning electron microscopic technique showed the formation of a thick film on the steel surface in the presence of inhibitors.
