Rajah Serfoji Government College Autonomous

Thanjāvūr, India

Rajah Serfoji Government College Autonomous

Thanjāvūr, India
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Chidhambaram N.,AVVM Sri Pushpam College Autonomous | Chidhambaram N.,Rajah Serfoji Government College Autonomous | Ravichandran K.,AVVM Sri Pushpam College Autonomous
Materials Research Express | Year: 2017

ZnO/g-C3N4 nanocomposite photocatalysts were prepared using a simple and cost-effective pyrolysis method. The structural, optical, surface morphological and photocatalytic properties of the nanocomposites were analyzed and compared with those of g-C3N4. X-ray diffraction results revealed that all the ZnO/g-C3N4 samples have a hexagonal wurtzite phase of ZnO. Spectroscopic results obtained via FT-IR technique were consistent with the layered structure of sp2 hybridized bonding features of C and N in g-C3N4, besides Zn-O stretching vibrations. Photoluminescence results revealed that ZnO hybridization with g-C3N4 showed efficient separation and delayed recombination of photoinduced electron-hole pairs. TEM analysis clearly displayed that ZnO nanoparticles are anchored on g-C3N4 and showed the interface between the ZnO and g-C3N4. The ZnO/g-C3N4 nanocomposites exhibited enhanced visible light photocatalytic degradation against methylene blue dye when compared to g-C3N4. A plausible mechanism has been proposed for the observed enhanced photocatalytic activity. © 2017 IOP Publishing Ltd.

Chidhambaram N.,AVVM Sri Pushpam College Autonomous | Chidhambaram N.,Rajah Serfoji Government College Autonomous | Ravichandran K.,AVVM Sri Pushpam College Autonomous
Materials Letters | Year: 2017

g-C3N4 nanoflakes were prepared via a single step pyrolysis route from urea. X-ray diffraction analysis confirms the graphitic phase of the synthesized carbon nitride material. FT-IR analysis confirms the layered structure of sp2 hybridized carbon and nitrogen bonding features. Photoluminescence spectrum of g-C3N4 sample demonstrates the existence of various emission centers located at 431, 452, 488 and 576 nm, which evidences the availability of different path ways for electronic transition. FESEM and TEM analysis reveal that the synthesized g-C3N4 has nanoflakes morphology. Photocatalytic activity of the g-C3N4 nanoflakes under visible light was tested against Methylene blue dye. © 2017 Elsevier B.V.

Ravichandran K.,AVVM Sri Pushpam College Autonomous | Chidhambaram N.,AVVM Sri Pushpam College Autonomous | Chidhambaram N.,Rajah Serfoji Government College Autonomous | Gobalakrishnan S.,Noorul Islam University
Journal of Physics and Chemistry of Solids | Year: 2016

ZnO, ZnO:Cu and ZnO:Cu:Graphene nanopowders were synthesized via a facile wet chemical method. The XRD studies show that the synthesized samples have hexagonal wurtzite structure. It is found that graphene addition induces a decrease in crystallite size. UV-vis absorption spectra of the samples show sharp absorption edges around 380 nm. Photoluminescence studies reveal that the incorporation of copper and graphene in ZnO facilitates the efficient photo generated electron-hole pair separation. It is found that the ZnO:Cu and ZnO:Cu:Graphene nanopowder exhibit improved photocatalytic efficiency for the photodegradation of Methylene Blue (MB) under visible light irradiation. Moreover, improved antibacterial activity of ZnO:Cu:Graphene nanopowder against Escherichia coli and Staphylococcus aureus bacteria is observed. © 2016 Elsevier Ltd. All rights reserved.

Rathinam K.M.S.,Rajah Serfoji Government College Autonomous
Asian Journal of Microbiology, Biotechnology and Environmental Sciences | Year: 2010

A detailed study was performed to determine the holding (or) trapping capacity of open celled polyurethane foam (PUF) for a silicon based defoamer that can be used in the defoaming purposes. The open celled polyurethane foam was found to have a high trapping capacity for undiluted defoaming agent and less trapping capacity for diluted defoaming agent even though the void space volume and the porous grade of all the open celled PUFs used for the study are same. Based on the observed results, it can be confirmed that the holding or trapping capacity of open celled polyurethane foam was decreasing as the increase in dilution of defoamer. It can also confirmed that the trapping capacity of open celled polyurethane foam for the said defoamer was not changing for 4 days of observation period at room temperature. © Global Science Publications.

Vidhyasagar T.,Annamalai University | Rajeswari K.,Annamalai University | Shanthi D.,Annamalai University | Kayalvizhi M.,Kunthavai Naachiar Government Arts College W Autonomous | And 3 more authors.
Acta Crystallographica Section E: Structure Reports Online | Year: 2015

The title compound, C22H17NO4, crystallizes with two independent molecules (A and B) in the asymmetric unit. Each molecule exists as an E isomer with C - C=C - C torsion angles of - 175.69 (17) and - 178.41 (17)° in A and B, respectively. In molecule A, the planes of the terminal benzene rings are twisted by an angle of 26.67 (10)°, while the biphenyl unit is non-planar, the dihedral angle between the rings being 30.81 (10)°. The dihedral angle between the nitrophenyl ring and the inner phenyl ring is 6.50 (9)°. The corresponding values in molecule B are 60.61 (9), 31.07 (8) and 31.05 (9)°. In the crystal, molecules are arranged in a head-to-head manner, with the 3-nitrophenyl groups nearly parallel to one another. The A and B molecules are linked to one another via C - H⋯O hydrogen bonds, forming chains lying parallel to (3¯20) and enclosing R22(10) and R22(12) ring motifs. The methoxy group in both molecules is positionally disordered with a refined occupancy ratio of 0.979 (4):0.021 (4) for molecule A and 0.55 (4):0.45 (4) for molecule B.

Manimekalai A.,Annamalai University | Saradhadevi N.,Annamalai University | Thiruvalluvar A.,Rajah Serfoji Government College Autonomous
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2010

The FT-IR and the high resolution 1H and 13C NMR spectra have been recorded for N'-(2-methyl-3phenylallylidene)nicotinohydrazide (1) and N'-(2-methyl-3-phenylallylidene)isonicotinohydrazide (2) and analyzed.1H-1H COSY spectra were also recorded for the hydrazides. The spectral studies reveal that both the hydrazides exist in the keto form. Theoretical calculations were performed for some possible conformations of the hydrazide and the minimum energy conformers are predicted to be the one in which the azomethine protons are syn to N-NH bond. From the optimized structures, HOMO-LUMO energy gap and geometrical parameters were derived and these parameters were compared with the XRD measurements of hydrazide 1. The vibrational frequencies in the ground state have been calculated using DFT and HF methods and compared with the observed frequencies. Non-linear optical (NLO) behaviour of the hydrazides was investigated by the determination of the electric dipole moment μ, the polarizability α and the hyperpolarizability β using B3LYP method. © 2010 Elsevier B.V. All rights reserved.

Ilangeswaran D.,Rajah Serfoji Government College Autonomous | Manisankar P.,Alagappa University
Electrochimica Acta | Year: 2013

A new electroactive and electrochromic copolymer of 4-aminodiphenylamine (ADPA) and 4,4′-diaminodiphenyl sulfone (DADPS) was synthesized electrochemically in 0.5 M H2SO4 in water and ethanol medium. The electrochemical synthesis of the copolymer by deposition on a glassy carbon electrode (GCE) and its characterization were carried out using cyclic voltammetry (CV). The voltammograms exhibited different patterns of behavior with different feed concentrations of DADPS. Equimolar concentrations of ADPA and DADPS or the combination with slight excess concentration of DADPS demonstrated very efficient growth of the copolymer film on the surface of the GCE. The copolymer is highly soluble in dimethyl sulfoxide (DMSO). The scan rate of this copolymer on GCE showed linear variation, revealing the film's excellent electroactive adherent properties. The effect of pH on the copolymer film showed that the polymer was electrochemically active up to pH 7.0. Spectroelectrochemical analysis of the copolymer film, carried out on an indium tin oxide (ITO) plate, showed multi-color electrochromic behavior when the applied potential was changed. The copolymer was characterized by FTIR and 1H NMR spectral data. The surface morphology was studied using SEM analysis and the grain size of the copolymer was measured using XRD studies and found to be 28 nm. The electrical conductivity of the copolymer was 3.48 × 10-2 S cm-1, as determined using a four-probe conductivity meter. © 2012 Elsevier Ltd.

Ravichandran K.,AVVM Sri Pushpam College Autonomous | Rajkumar P.V.,AVVM Sri Pushpam College Autonomous | Sakthivel B.,AVVM Sri Pushpam College Autonomous | Swaminathan K.,RKM Vivekananda College Autonomous | Chinnappa L.,Rajah Serfoji Government College Autonomous
Ceramics International | Year: 2014

ZnO thin films were deposited using a successive ionic layer adsorption and reaction (SILAR) method from three different precursors viz. zinc acetate, zinc sulfate and zinc chloride. All the films were annealed in air and vacuum ambiences at 350 °C and characterized for their structural, optical, photoluminescence, electrical and surface morphological properties. The XRD profiles show that the crystalline quality of the films is improved after annealing in both the environments. It is found that the preferential orientation changes from (002) plane to (100) plane after atmospheric annealing for the films prepared from zinc acetate and zinc sulfate precursors, whereas no transition in preferential orientation is observed for films deposited from zinc chloride. Vacuum annealing does not affect the preferential orientation of all the three sets of films, but the intensities of diffraction peaks are increased remarkably. The films fabricated from zinc acetate and zinc sulfate precursors exhibit good average optical transmittance of 80% in the visible region after annealing whereas that deposited from zinc chloride exhibits only 70% transmittance. Compared with as-deposited and air annealed films, the vacuum annealed films exhibit lower electrical resistivity. An increase in the optical band gap and improvement in the surface morphology are also observed after annealing under both the ambiences for all the films, irrespective of the precursor used. The photoluminescence studies support the results on crystalline quality and optical band gap. © 2014 Elsevier Ltd and Techna Group S.r.l.

Jayabarath J.,Rajah Serfoji Government College Autonomous | Jeyaprakash K.,Rajah Serfoji Government College Autonomous
Journal of Chemical and Pharmaceutical Sciences | Year: 2015

The present work was carried out to investigate the medicinally active compounds present in the methanolic extract of Turbinaria conoides by using the analysis of TLC, UV-VIS and FTIR. In the present investigation, chromatographic techniques such as thin layer chromatography (TLC) analysis was used to separate and isolate flavonoid compound from the crude extract of Turbinaria conoides. The solvent system of TLC was n-Butanol, Acetic acid and water in the ratio of 4:1:5 was used and its Rf value was detected. For UV-VIS Spectrophotometric analysis, the extract of Turbinaria conoides was scanned in the wavelength ranging from 190-800 nm by using Perkin Elmer Spectrophotometer and the characteristic peaks and their absorption values were detected. For FTIR Analysis, the extract of Turbinaria conoides was focused in the transmittance ranging between 400-4000cm-1 on a Perkin Elmer Spectrophotometer system and the characteristic peak values and their functional groups were detected. From TLC analysis result, a spot was identified with Rf value was 0.66. This Rf value was compared with literature data showed that the presence of flavonoid compound as Quercetin-3-galactoside. The UV-VIS profile showed the peaks at 200,224,232, and 669 nm with the absorption values 3.15, 4.25, 3.65 and 0.25 respectively. The result of UV-VIS spectroscopic analysis confirms the presence of phenols and Flavonoids in the Turbinaria conoides extract. The results of the present FTIR study confirms the presence of Phenol, Alkane, Alkene, Carboxylic acid, Aromatic compound, Nitro compound, Alcohol, Silicon, Ketones, Benzene and Bromo alkanes compounds. The results of the present study were revealed that the presence of phenols, flavonoids and functional groups of the Turbinaria conoides which indicates the medicinal importance of this Seaweed.

Ramya B.,Rajah Serfoji Government College Autonomous | Malarvili T.,Rajah Serfoji Government College Autonomous | Velavan S.,Marudupandiyar College
International Journal of Pharma and Bio Sciences | Year: 2015

The study was planned to analyse the vitamins and minerals present in Bryonopsis laciniosa fruit.Study revealed that the fruit contains Vitamins like C,D and E.Iron was found to be very much abundant and Calcium, Magnesium, Potassium, Chloride are in high amount. Sulphate and sodium are in a moderate level. Carbon, phosphorous, sodium, sulphur, zinc and manganese are substantially present while copper, Boron, selenium and molybdenum are present in trace amounts. These substances may be responsible for the health related properties which are based on their antioxidant, anticancer, antipyrectic, antiaphoretic, antidiabetic, anti-inflammation, antiheamatisum, antimicrobial and antiviral activity.

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