Ramesh V.,Bharathiar University |
Sendil Kumar K.,Bharathiar University |
Jagannathan K.,SRM University |
Sridevi D.V.,GanadipathyTulsis Engineering College |
Rajarajan K.,Rv Government Arts College
International Journal of ChemTech Research | Year: 2014
Single crystal of bis mercury ferric chloride tetra thiocyanate [Hg2FeCl3(SCN)4; (MFCTC)] was grown from ethanol-water (3:1) mixed solvent using slow evaporation solvent technique (SEST). The cell parameters of the grown crystal were confirmed by single crystal XRD. The presence of functional groups and coordination of transition metal ions with the SCN ligand is well identified using FT-IR spectral profile. The UV-Vis-NIR study revealed the ultraviolet cut-off wavelength of MFCTC in ethanol as 338 nm. The dielectric constant and dielectric loss of the sample were studied as a function of frequency and temperature. The thermal stability and thermal decomposition of MFCTC were analyzed by using TG-DTA and DSC, which show that the sample is thermally stable up to 234.31°C which is comparatively far better than the thermal stability of Hg3CdCl2(SCN)6; (171.3°C). The nonlinear optical efficiency of the grown crystal was estimated by Kurtz powder method and the result proves that MFCTC is found to be superior to KDP.
Esther Jeyanthi C.,Bharathiar University |
Esther Jeyanthi C.,Panimalar Engineering College |
Siddheswaran R.,University of West Bohemia |
Medlin R.,University of West Bohemia |
And 3 more authors.
Journal of Alloys and Compounds | Year: 2014
The reported article deals with the synthesis and characterization of rare earth ions doped ceria (RE3+:CeO2) nanopowders from citrate nitrate auto-combustion route. The crystalline nature and lattice planes of the nanocrystalline RE3+:CeO2 powders were analyzed by X-ray diffraction (XRD) and Selected Area Electron Diffraction (SAED) profile fit. The excited state absorption (ESA) and energy transfer up-conversion (ETU) were studied by photoluminescence (PL) measurement. The spectroscopic properties of the powders were studied using Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. The surface morphology, average size, distribution and orientation of the lattice planes of the nanoparticles were studied by using scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). The size of RE3+:CeO 2 nanoparticles were found to be in the range from 15 to 30 nm which has good agreement with the HRTEM results. The changes in current density with increasing sweep scan potential of the doped ceria powders were studied by cyclic voltammetry (CV) analysis. The specific capacitance range of the rare earths doped ceria of Er:CeO2, Pr:CeO2, Yr:CeO2 and Nd:CeO2 were calculated as (12.9-86.5), (20-72.4), (80-375) and (0.92-4.22) respectively. © 2014 Elsevier B.V. All rights reserved.
Ramesh Babu K.,Rv Government Arts College |
Selvanayagam M.,Rv Government Arts College |
Selvanayagam M.,Loyola College
Indian Journal of Environmental Protection | Year: 2016
The prevalence and seasonal variation of bacterial indicators of faecal pollution, such as total coliform bacteria, faecal coliform bacteria and faecal streptococci were investigated in samples of Kolavai Lake water, Chengalpet, Tamil Nadu. Further, the samples were screened to study the reliability of faecal indicator bacteria as an index of human pathogenic bacteria. Total coliform bacteria, faecal coliform bacteria were isolated from the lake. Faecal streptococci were also detected in most samples. The total coliform and faecal forms were observed in maximum as 3000 and 1200, respectively in the lake. Which is more than the permissible limit. The result showed that the water is polluted and presents a potential risk to public for recreational and fishing activities. © 2016 - Kalpana Corporation.
Vetha Potheher I.,Anna University |
Rajarajan K.,Rv Government Arts College |
Vimalan M.,Physics Research Center |
Tamilselvan S.,Loyola College |
And 2 more authors.
Physica B: Condensed Matter | Year: 2011
The growth of nonlinear optical single crystal of manganese mercury thiocyanate glycol monomethyl ether (MMTG), a Lewis base adduct of manganese mercury thiocyanate (MMTC), is reported. MMTG crystallizes in orthorhombic structure with Pca21 space group. The optical band gap energy of the sample is found to be 3.5 eV. The sample is thermally stable up to 145 °C. The grown crystal is characterized by photoluminescence, dielectric, dc conductivity, photoconductivity and SEM studies. From the photoluminescence study, the suitability of the material for blue and green light generation is confirmed. The electric and dielectric response of the grown crystal is studied as a function of temperature and the results are discussed. The dc activation energy of the sample is found to be 0.048 eV. © 2011 Elsevier B.V. All rights reserved.
Mani G.,Arignar Anna Government Arts College |
Rajarajan K.,Rv Government Arts College |
Caroline M.L.,Arignar Anna Government Arts College |
Sagayaraj P.,Loyola College |
Mohan R.,Presidency College at Chennai
Materials Research Innovations | Year: 2015
Single crystals of pure and thiourea doped ammonium pentaborate have been successfully grown by slow solvent evaporation technique. The growth conditions and surface morphology of pure and thiourea doped single crystals of APBO are optimised and the grown crystals are confirmed by X-ray diffraction. The crystals are characterised by Fourier transform infrared spectroscopy and UV-vis-NIR spectral techniques. The grown crystals of pure and thiourea doped APBO are subjected to thermal studies. The thermogravimetry and derivative thermogravimetry studies confirm that the decomposition of pure and doped crystals takes place in three different stages making them suitable for device fabrication for frequency conversion applications. The second harmonic generation of the crystals are confirmed by Nd :YAG pulsed laser employing Kurtz powder technique and the influence of thiourea is also discussed. The Vicker microhardness test was carried out on the grown crystals to study the mechanical strength therein the Vicker's hardness number (Hv) and Work hardening coefficient (n) were calculated. © W. S. Maney & Son Ltd 2015.
Ramesh babu K.,Rv Government Arts College |
Selvanayagam M.,P.A. College
International Journal of ChemTech Research | Year: 2012
The accumulation of Heavy metals in water, Sediment, Cirrhinus mrigala, Labeo rohita and Tilapia mossambica are determined by Atomic Absorption Spectrophotometer in Kolavoi Lake, chengalpet. In Water, the Concentration of Cd, Cu, Cr, Pb, Fe are varied seasonally from BDL -0.004 mg/L, 0.078- 0.126mg/L, BDL-0.008mg/L, 0.098-0.142mg/L,7.230-8.076mg/L respectively. Among all the metals analysed in the sediment, Fe was observed to be the highest during summer and Cd, the lowest during premonsoon. In the three species of fishes studied, the Concentrations of Cd, Cu, Cr,Pb and Fe varied seasonally from BDL -0.043 mg /kg, BDL - 2.680mg/Kg, BDL-0.982mg/Kg, BDL-0.842mg/Kg, 0.552- 61.240mg/Kg respectively. Of the five metals studied, the Fe concentration was detected to be the highest during Monsoon and in contrast, Cd concentration was found to be minimal throughout the year. Cr and Cu concentrations are assessed to be higher than the recommended values. Which suggests, that the Kolavoi Lake to a certain extent, exhibits toxicity in water, sediment and fishes, making it deleterious to human health.