s. Suresh; v. Seetharaman; R. Mohan Kumar
Abstract
p-Toludinium fumarate (PTF) a potential organic single crystal was grown by slow evaporation solution growth technique. Single crystal X-ray diffraction study was used to compute the unit cell parameters. The nuclear magnetic resonance spectral study reveals the proton and carbon molecular structure ...
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p-Toludinium fumarate (PTF) a potential organic single crystal was grown by slow evaporation solution growth technique. Single crystal X-ray diffraction study was used to compute the unit cell parameters. The nuclear magnetic resonance spectral study reveals the proton and carbon molecular structure of PTF crystal. Optical band gap and the percentage of optical transmission were established by using UV-visible spectroscopy. Photoluminescence studies show that emission is independent of excitation wavelength. Dielectric constant (ε') and dielectric loss (tan δ) of PTF crystal were studied. The third order nonlinear refractive index (n2) and third order nonlinear absorption coefficient (β) were estimated by Z-scan technique.
Rajani Bharati; S. Suresh
Abstract
The aim of this research work is Synthesis of ZnO/SiO2 with Palash leaves extract nanocatalyst by green synthesis route. Palash leaves extract contain a broad variability of bio-molecules which act as capping and reducing agents and increases the rate of reduction and stabilization of nanoparticles. ...
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The aim of this research work is Synthesis of ZnO/SiO2 with Palash leaves extract nanocatalyst by green synthesis route. Palash leaves extract contain a broad variability of bio-molecules which act as capping and reducing agents and increases the rate of reduction and stabilization of nanoparticles. Nanocatalyst synthesized by this method are eco-friendly and cheap. No work has been found on Butea monosperma (Palash) leaves extract with ZnO nanoparticles. This research work synthesis of ZnO/SiO2 with palash leaves extracts nanocatalysts has been made by using green synthesis route. This synthesized nanocatalyst was used for removal of COD (mg/l) and polycyclic aromatic hydrocarbons as pollutants from petrochemical industrial wastewater. The synthesized nanocatalyst of ZnO/SiO2 with palash leaves extract was characterized using BET surface area, FEG-SEM, EDAX, XRD, and FTIR. Results show that we have synthesized ZnO/SiO2 nanocatalyst with BET surface area 160.23 m2/g and SEM micrograph shows the spot of nano range particles. From SEM test it has been found that we synthesized ZnO/SiO2 nanoparticles in the range of 3 to 35 nm and average particle diameter is 15.8nm. XRD and EDAX result show that we have found nanoparticles of SiO2 and ZnO. FTIR results show that Zn-O, Si-O-Si stretching have been found at 1004.95, 861.24 cm-1 for ZnO and 1270.17 cm-1 for SiO2 respectively. Results shows that optimum percent removal of COD (mg/l) and acenaphthene (polycyclic aromatic hydrocarbon) as pollutant are 70 % and 79% respectably at 0.5g/500ml catalyst loading, at 30oC temperature for 4h reaction time. In Future this catalyst can be used to remove other PAH and phenolic compounds from petrochemical wastewater under visible light also and other industrial wastewater can also treat by this catalyst effectively. Copyright © 2018 VBRI Press.
P. Rosaiah; G. Lakshmi Sandhya; S. Suresh; Jinghui Zhu; Yejun Qiu; O. M. Hussain
Abstract
Vanadium pentoxide (V2O5) thin films have been prepared onto ITO coated flexible Kapton substrates by electron beam evaporation technique. The influence of substrate temperature on the structural, morphological, optical and electrical properties has been investigated. The XRD results reveals that the ...
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Vanadium pentoxide (V2O5) thin films have been prepared onto ITO coated flexible Kapton substrates by electron beam evaporation technique. The influence of substrate temperature on the structural, morphological, optical and electrical properties has been investigated. The XRD results reveals that the films prepared at lower temperatures are amorphous in nature and the films prepared at 300 oC is exhibited predominant (001) orientation with an orthorhombic crystal structure. AFM study showed that the grain size varies from 80 nm to 150 nm. The optical studies revealed that the transmittance decreased with increasing substrate temperature. The optical absorption coefficient ‘a’ determined from the experimentally measured transmittance and reflectance data for V2O5 films was found to give a better fit for the exponent n = 3/2 suggesting the direct forbidden transitions with an estimated optical band gap of 2.31 eV for the films prepared at 300 oC. The electrical conductivity has been observed to be increased from 2 x 10-6 S/cm to 3 x 10-2 S/cm by varying temperature from 30 oC to 300 oC. The electrochemical experiments exhibited the discharge capacity of about 60 μAh/(cm2-μm) for the films deposited at 300 oC.
