National College Autonomous
National College Autonomous
Ramasamy R.,National College Autonomous |
Chandramohan R.,Sree Sevugan Annamalai College
Journal of Chemical and Pharmaceutical Research | Year: 2015
Copper Oxide is a material which has many applications in nano scale. It has a very good heat conducting property and also it is a p-type semiconductor. But, it cannot be used in conditions which involves temperatures above 400ºC. Around this temperature, degradation of CuO takes place. Further, in solar cell applications, as a p-type semiconductor, over a period of very short time, CuO degrades, rendering the device unusable. When Silicon dioxide is doped with CuO, with less than one percent by atomic weight, its stability increases so that it can be efficiently used in many applications. In this study, SiO2 is successfully doped with CuO, using Sol gel method and characterized. FTIR confirms the presence of CuO and SiO2 in the sample. EDAX shows that the sample contains Copper, Oxygen and Silicon in the sample so that there is no contamination in the sample. XRD studies reveal that the sample has CuO and it does not contain Cu2O. The crystallite size is determined to be 2.48 nm using Debye-Scherrer equation. Presence of SiO2 could not be confirmed using this study due to its negligible presence. SEM image shows that there is agglomeration of the particles, which is due to the high temperature involved in the process which is 700ºC and that the size of the particles are less than 200 nm, which is the smallest scale, in the image. Hence, SiO2 doped CuO is doped successfully and it is characterized. © 2015, Journal of Chemical and Pharmaceutical Research. All Right Reserved.
Senthamilselvi V.,Kunthavai Naachiyaar Government College for Women Autonomous |
Senthamilselvi V.,AVVM Sri Pushpam College Autonomous |
Saravanakumar K.,AVVM Sri Pushpam College Autonomous |
Anandhi R.,AVVM Sri Pushpam College Autonomous |
And 3 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2012
CdS films were fabricated using Successive Ionic Layer Adsorption and Reaction (SILAR) technique from starting solutions having S:Cd ratio 1:1, 3:1, 5:1 and 7:1 and their structural, surface morphological and optical properties were investigated and compared with that of their chemical bath deposited counterparts. The X-ray diffraction profiles showed that the films have cubic crystal structure with preferential orientation along the (111) plane and the intensity of the (111) plane increases for both the techniques as the S:Cd ratio increases. The energy dispersive X-ray analysis revealed that for SILAR deposited films, the S/Cd ratio in the sample increases from 0.8308 (for S:Cd 1:1) to 1.04 (for S:Cd 7:1) as the molar concentration of sulphur in the starting solution increases. But for CBD films, the S/Cd is only ∼0.80 for all concentrations of sulphur in the starting solution. The optical band gap increases with the increase in S:Cd ratio in the starting solution in both the techniques. © 2011 Springer Science+Business Media, LLC.
Keerthiga M.,National College Autonomous |
Anand S.P.,National College Autonomous
International Journal of Pharmacy and Pharmaceutical Sciences | Year: 2014
Objective: To evaluate the Physicochemical, Preliminary Phytochemical analysis and Antibacterial activity of Geodorum densiflorum against clinical pathogens and to prove the orchid will target to meet the therapeutic demands.Methods: The physicochemical parameters and Preliminary Phytochemical analysis of the orchid were studied. The antibacterial properties using the following bacterial strains, ie., Escherichia coli, Staphylococcus aureus, Bacillus subtilis, Streptococcus pyogenes, Klebseilla pneumoniea, Pseudomonas aeruginosa were studied. Streptomycin were used as a control and study was conducted using disc diffusion method and the MIC value also be evaluated.Results: The Physicochemical parameters show the presence of bioactive compounds. The phytochemical screening revealed the presence of Alkaloids, Tannins, Flavonoids, Sopanins, Steroid and Terpenoids. The ethanol extract showed significant total activity against Staphylococcus aureus than other extracts.Conclusion: The ethanol extract of Geodorum densiflorum can successfully used as a pharmaceutical agents as antibacterial drug. © 2014, IJPPS. All rights reserved.
Sekar K.G.,National College Autonomous |
Edison Raj C.L.,St. Joseph's College
Journal of Chemical and Pharmaceutical Research | Year: 2011
Imidazolium dichromate (IDC) oxidizes benzyl alcohol and substituted benzyl alcohols have been studied in aqueous acetic acid and in the presence of acid to the corresponding aldehydes. The reaction was carried out under pseudo-first order conditions. The reaction has unit dependence on each of the benzyl alcohol and IDC. The reaction is catalyzed by hydrogen ions. The decrease in dielectric constant of the medium increases the rate of the reaction. Electron-withdrawing substituent on benzyl alcohol reduces the rate of oxidation, while electron-donating group enhances the rate compared to the unsubstituted benzyl alcohol. However, correlation of the logarithm of the rate constant with the Hammett's substituent constant σgives a smooth curve. This is explained due to the operation of substituent effect on two steps of the mechanism proposed.
Anand S.P.,National College Autonomous |
Jeyachandran R.,St. Joseph's College |
Nandagopalan V.,National College Autonomous
Journal of Pharmaceutical Sciences and Research | Year: 2011
Zehneria scabra is an important climber belongs to the family Cucurbitaceae, which has used in many traditional medicinal systems. It has many medicinal values such as to cure fever, diarrhoea, skin diseases, stomach pain and treat livestock. Such bioactive chemical compounds identified by Nuclear Magnetic Resonance (NMR) spectral analysis. The proton nuclear magnetic resonance spectra of the root sample were recorded and the chemical shift values of the various signals are identified by the presence of Gypenoside. This bioactive compound is confirmed as the valuable medicinal compound likely to cure vast array of disease.
Mangaiyarkarasi K.,National College Autonomous |
Ravichandran A.T.,National College Autonomous
International Journal of ChemTech Research | Year: 2014
L-Phenylalaninium Acetate single crystal was grown by conventional method.L- Phenylalanine and Acetic acid was taken in 1:1 ratio and dissolved in distilled water, the saturated solution was prepared by the magnetic stirrer, Then the solution was kept for controlled evaporation after 20 days the LPAA single crystals were harvested. The grown crystal was examined by Powder XRD, FTIR, UV, TG/DTA and Microhardnes test and the results were discussed. From the XRD the structure of the crystal and the parameters of the crystal were founded. From UV the transparency and the cut-off wavelength were calculated. The stability of the crystal was confirmed by TG/DTA analysis.
Sekar K.G.,National College Autonomous |
Periyasamy S.K.,National College Autonomous
Arabian Journal of Chemistry | Year: 2013
The kinetics of oxidation of thioglycolic, thiolactic and thiomalic acids by quinaldinium fluorochromate [QnFC] has been studied in non aqueous medium. The oxidation kinetics was followed spectrophotometrically in the temperature range of 30-60 °C. The reaction shows unit order dependence each with respect to substrate and oxidant. The reaction is catalysed by hydrogen ions. The hydrogen ion dependence takes the form kobs = a + b [H+]. The reaction rate decreases with increasing the concentration of Mn2+ ions. The reaction does not induce polymerization of acrylonitrile. A plausible mechanism has been proposed for the formation of a thioester and its decomposition which occur in the slow step. © 2013 King Saud University.
Ramasamy R.,National College Autonomous
Journal of Applied Spectroscopy | Year: 2013
Solid phase FTIR and FT-Raman spectra of pyridoxazinone have been recorded in regions of 4000-50 cm-1 and 3500-100 cm-1 respectively. The spectra were interpreted by normal coordinate analysis following full structure optimizations and force field calculations based on density functional theory (DFT) using the standard B3LYP/6-31G* and B3LYP/6-311+G** method and basis set combinations. The results of the calculations are applied to simulate infrared and Raman spectra of the title compound, which showed excellent agreement with the observed spectra. © 2013 Springer Science+Business Media New York.
Vivekanandan K.,National College Autonomous |
Lakshmi Narayanan R.,National College Autonomous
Der Pharma Chemica | Year: 2016
The oxidation of an essential amino acid like lysine by nicotinium dichromate in aqueous medium in the presence of perchloric acid was studied. The reaction was first order with respect to oxidant, fractional order with respect to substrate and second order with respect to perchloric acid. The increase in ionic strength had negligible effect on the rate. Amino acid was converted to the corresponding carbonyl compound. No polymerisation was observed with acrylonitrile. The addition of Mn2+ ion had a noticeable catalytic effect on the rate. The rates were determined at four different temperatures and the thermodynamic parameters were evaluated.
Muruganantham G.,P.A. College |
Ravichandran K.,P.A. College |
Saravanakumar K.,P.A. College |
Ravichandran A.T.,National College Autonomous |
Sakthivel B.,P.A. College
Superlattices and Microstructures | Year: 2011
Undoped and fluorine doped tin oxide films were deposited from starting solutions having different values of solvent volume (10-50 ml) by employing a low cost and simplified spray technique using perfume atomizer. X-ray diffraction studies showed that there was a change in the preferential orientation from (2 1 1) plane to (1 1 0) plane as the volume of the solvent was increased. The sheet resistance (Rsh) of undoped SnO2 film was found to be minimum (13.58 KΩ/□) when the solvent volume was lesser (10 ml) and there was a sharp increase in Rsh for higher values of solvent volume. Interestingly, it was observed that while the R sh increases sharply with the increase in solvent volume for undoped SnO2 films, it decreases gradually in the case of fluorine doped SnO2 films. The quantitative analysis of EDAX confirmed that the electrical resistivity of the sprayed tin oxide film was mainly governed by the number of oxygen vacancies and the interstitial incorporation of Sn atoms which in turn was governed by the impinging flux on the hot substrate. The films were found to have good optical characteristics suitable for opto-electronic devices. © 2011 Elsevier Ltd. All rights reserved.