Sri Paramakalyani College

Alwarkurichi, India

Sri Paramakalyani College

Alwarkurichi, India

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Ariharan V.N.,Sri Paramakalyani College | Kalirajan K.,Sri Paramakalyani College | Nagendra Prasad P.,Noorul Islam Center For Higher Education
International Journal of Pharma and Bio Sciences | Year: 2014

An increasing demand for natural additives has shifted the attention from synthetic to natural antioxidants. The main objective of this research work to establish the antioxidant property of different Phenotypic traits of Aegle marmelos leaf in methanol and water extracts. In the present study three different morphological traits namely Trait I, Trait II and Trait III of Aegle marmelos leaf extracts on water and methanol solvents were subjected to antioxidant studies such as DPPH(2,2-diphenyl-1-picrylhydrazyl) and FRAP (Iron Chelating activity). The results were presented and discussed in the communication.

Ariharan V.N.,Sri Paramakalyani College | Nagendra Prasad P.,Noorul Islam Center for Higher Education
Rasayan Journal of Chemistry | Year: 2014

Aegle marmelos is an important medicinal plant used to treat many common ailments in Indian traditional systems of medicine. The present study was undertaken to find out a scientific validation for the efficacy of Aegle marmelos leaves as a natural antibiotic. Aqueous extract of Aegle marmelos leaves of the three morphological traits were prepared and screened for their antibacterial activity against some human pathogenic bacteria. © 2014 RASĀYAN. All rights reserved.

Vettumperumal R.,Sri Paramakalyani College | Kalyanaraman S.,Sri Paramakalyani College | Thangavel R.,Indian School of Mines
Journal of Molecular Structure | Year: 2014

Nanocrystals of Na-doped and Na, Mg codoped ZnO thin films were prepared by sol-gel spin coating method on glass substrate at different annealing temperatures. The deposited films were characterized by X-ray diffraction (XRD), Micro Raman, photoluminescence (PL) and UV-Visible measurements. The codoped films had hexagonal wurtzite structure and there were no peaks belonging to Na and Mg or its oxides observed from XRD. Surface morphology of the films was scrutinized by scanning electron microscope (SEM) and atomic force microscope (AFM) showing wrinkle structures that appeared on the film surface. Elemental compositions of the films were analysed using energy dispersive X-ray (EDX) spectra. The LO phonon modes were observed up to the fifth order and their enhancement was observed by the presence of Frohlich contribution. From μ-PL, the strong near band edge emission observed at 3.24 eV was blue shifted due to the band filling of free carriers. Fundamental absorption edge was observed at 370 nm and the optical band gap was decreased with respect to ZnO. Reduction of Urbach energy among codopants is small indicating less disorder. © 2013 Elsevier B.V.

Vijayalakshmi S.,Manonmaniam Sundaranar University | Vijayalakshmi S.,Sri Paramakalyani College | Kalyanaraman S.,Sri Paramakalyani College | Ravindran T.R.,Indira Gandhi Center for Atomic Research
Chemical Physics Letters | Year: 2014

Second harmonic generation (SHG) in Bis (Cinnamic acid): Hexamine cocrystal was extensively analyzed through charge transfer (CT). The CT interactions through hydrogen bonding were well established with the aid of vibrational analysis and Natural Bond Orbital (NBO) analysis. The retentivity of coplanar nature of the cinnamic acid in the cocrystal was confirmed through UV-Visible spectroscopy and supported by Raman studies. Structural analysis indicated the quinoidal character of the given material presenting a high SHG efficiency. The first order hyperpolarizability value was calculated theoretically by density functional theory (DFT) and Hartree-Fock (HF) methods in support for the large value of SHG. © 2014 Elsevier B.V. All rights reserved.

Kalyanaraman S.,Sri Paramakalyani College | Vettumperumal R.,Sri Paramakalyani College | Thangavel R.,Indian School of Mines
Journal of the Korean Physical Society | Year: 2013

Undoped and lithium-doped zinc oxide (ZnO) thin films have been deposited on sapphire substrates (0001) using the sol-gel method. The effect of doping with various percentages of Li at a particular annealing temperature of 600 °C is studied. The samples are characterized using Xray diffraction (XRD), scanning electron microscopy (SEM), micro-photoluminescence (μ-PL) and Raman and polarized Raman (PR) spectroscopy. The X-ray diffraction and micro-Raman spectroscopy confirm the presence of lithium substitution for zinc. The wurtzite structure of the lattice is retained, and five multiple phonon Raman modes are observed. The values of the depolarization ratios are calculated from polarized Raman data. Photoluminescence shows a strong emission peak in the near UV at 3. 276 eV and negligible visible emission. The PL peak positions in the doped samples nearly coincide with each other, suggesting very similar recombination mechanisms in the nanocrystals. © 2013 The Korean Physical Society.

Vettumperumal R.,Sri Paramakalyani College | Kalyanaraman S.,Sri Paramakalyani College | Thangavel R.,Indian School of Mines
Journal of Sol-Gel Science and Technology | Year: 2013

Nano crystalline cesium (Cs) doped ZnO thin films were deposited on glass substrate by sol gel spin coating method with 1-3 mol.% doping concentration and different annealing temperatures. The deposited films were characterized by X-ray diffraction (XRD), Hall Effect, Photoluminescence (PL) and UV-Visible studies. XRD measurements reveal that all the samples abound in the wurtzite structure with polycrystalline nature. An increase in crystalline size from 19.60 to 44.54 nm is observed with the increase of doping concentration. Electrical conductivity of Cs doped ZnO films were observed from Hall effect measurements and the maximum carrier concentration obtained is 7.35 × 1018 cm-3. The near band emission (384 nm) peak intensity increases with the increase of Cs doping concentration and a maximum intensity 55,280 was observed for CZ3 film from PL spectrum. Also a low energy near infrared (NIR) emission peak centered at 1.62 eV appears for the Cs doped ZnO films. The average transmission of CZ film is 88 % and the absorption edge is red shifted with the increase of Cs doping concentration and also the optical conductivity increases in the UV region. © 2013 Springer Science+Business Media New York.

Varadhaseshan R.,Sri Paramakalyani College | Meenakshi Sundar S.,Sri Paramakalyani College
Applied Surface Science | Year: 2012

Ni doped ZnO (Zn 1-xNi xO, in which 0.1 ≤ x ≤ 0.4) diluted magnetic semiconductor nanoparticles are prepared by microwave irradiated solvothermal process. The structural properties are studied using X-ray diffraction. It is evident from the XRD spectrum that the Ni doped ZnO nanocompounds exhibit single phase hexagonal wurtzite structure with strong c-axis orientation. To improve the crystalline quality the samples are annealed at 400 °C. The effects of annealing temperature and dopant concentration on the structural properties are also discussed. Unit cell expansion is clearly observed in Ni doped ZnO nanocrystals. The TEM images confirm that the particle size is 20 nm and the particles are well dispersed. The magnetic property of the nanocrystals was measured using vibrational sample magnetometer. According to the magnetization measurements ferromagnetic behavior was found in Zn 0.9Ni 0.1O combination. However, for the other higher dopant ratios paramagnetism is observed. © 2012 Elsevier B.V.

Vijayalakshmi S.,Sri Paramakalyani College | Kalyanaraman S.,Sri Paramakalyani College
Optical Materials | Year: 2013

The synthesis and non-linear optical properties of nitro aniline derived Schiff bases of 9-anthraldehyde were carried out. The compounds were characterized using FT-IR, Raman and UV-Vis spectroscopies. The FT-IR and Raman spectral data revealed the confirmation of Schiff bases with the absorption band assignable to the stretching of CN band. The charge transfer (CT) interaction between the donor and acceptor molecules were confirmed through λmax of the UV-Vis spectra. The UV-Vis analysis indicated, bathochromic shift in the compounds, implying a non-zero first order molecular hyperpolarizability (β) which are translated into macroscopic non-linearity χ2. To investigate the solid state macroscopic non-zero non-linear optical response, χ2, (second harmonic generation) the Kurtz and Perry method was used. This happens to be the first report on the non-linear optical analysis of these compounds. © 2012 Elsevier B.V. All rights reserved.

Vijayalakshmi S.,Sri Paramakalyani College | Kalyanaraman S.,Sri Paramakalyani College
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2014

Fourier-Transform Infrared (FT-IR) spectroscopy supported by Raman spectroscopy has been employed to explain the conventional and unconventional hydrogen bonding present in the 4,4′thiodiphenol: hexamine and 4,4′sulfonyldiphenol: hexamine cocrystals. The possible internal and external vibrational modes are predicted through factor group analysis. Influence of intra molecular charge transfer (ICT) interaction caused by the strong ionic ground state hydrogen bonding between charged species, giving rise to a non centro symmetric structure which is a criterion for second harmonic generation (SHG) efficiency has been discussed. Intense low wave number hydrogen bond vibrations in Raman which arise due to electron-phonon coupling are analyzed. Optical quality of adducts is identified through UV-Vis analysis. The second harmonic generation efficiency of both adducts is determined by Kurtz-Perry method. © 2013 Elsevier B.V. All rights reserved.

Suresh Kumar M.,Sri Paramakalyani College | Ranjit Singh A.J.A.,Sri Paramakalyani College | Alagumuthu G.,Sri Paramakalyani College
Indian Journal of Traditional Knowledge | Year: 2012

In India honey bees like Apis cerana and Apis mellifera are reared for commercial purpose. The other bees like rock bee (Apis dorsata), little bee (Apis florea) and dammer bee (Trigona sp) are not domesticated because of their ecophysiology. However, the kani tribes living in Karayar area of Kalakad-Mundanthurai Tiger Reserve area (KMTR) of Western Ghats have developed a novel method of rearing the dammer bees. The objective of the study is to understand the traditional skill of Kani tribes to rear the stingless bee (Trigona sp.) which was not used for regular bee keeping. The present study also gives importance to evolve commercial strategies to get honey (medicinal honey) from Trigona sp. The findings of the present study will help to preserve the art of rearing stingless bees and to introduce modern techniques to harvest pure, clean and uncontaminated honey by suitable modifications in the indigenous practice of stingless bee rearing. The honey produced by dammer bees is a panacea for much human illness. The Kani tribes have developed a bamboo pole bee hive to keep this stingless bee belonged to the species Trigona irredipensis. The dammer bees build an interesting type of comb made of propolis, mud and about 600-700gm honey is collected per year per hive. Because of rich medicinal value the honey collected from this beehive is sold at a rate of Rs.1000/Kg.

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