Nmss Vellaichamy Nadar College

Madurai, India

Nmss Vellaichamy Nadar College

Madurai, India
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Gurulakshmi S.,Vellore Institute of Technology | Gurulakshmi S.,Guru Nanak Institutions | Madeswaran S.,Vellore Institute of Technology | Karthikeyan S.,Madras Christian College | And 2 more authors.
Springer Proceedings in Physics | Year: 2017

Poly (vinyl alcohol)—Cellulose acetate (PVA/CA) blend polymer doped with Ammonium thiocyanate salt in the presence of Ethylene Carbonate (EC) as a plasticizer were prepared by simple solution casting technique. PVA/CA blend ratio was first optimized for highest conductivity value (3.63 × 10−6 S/cm). The ionic conductivity of PVA/CA blend was further enhanced by adding 0.5 mol wt% NH4SCN and 0.3 mol wt% EC. The value of the ionic conductivity at room temperature was increased to 7.7 × 10−4 S/cm. AC impedance spectroscopy studies were used to calculate ionic conductivity values. Fourier Transform— Infrared Spectroscopy measurements revealed the existence of blending and salt complexation with host polymer. Activation energy and relaxation time were observed for the prepared plasticized membranes using Arrhenius plot and loss tangent spectra. The ionic conductivity at room temperature was further increased to the value of 2.1 × 10−3 S/cm by the addition of nano-alumina particles. © Springer International Publishing Switzerland 2017.


Sathiya S.M.,Arul Anandar College Autonomous | Okram G.S.,UGC-DAE Consortium for Scientific Research | Maria Dhivya S.,Arul Anandar College Autonomous | Manivannan G.,Nmss Vellaichamy Nadar College | And 3 more authors.
Materials Today: Proceedings | Year: 2016

Zinc Oxide nanoparticles (ZNPs) and CS/Zinc oxide nanocomposites (CS/ZnO NCs) were successfully synthesized by wet chemical method. Formation of ZNPs and the interaction of CS/ZnO NCs were characterized by X-ray diffraction (XRD), Zeta potential, and Transmission Electron Microscopy (TEM) techniques. Thermal stability of the prepared samples was characterized by Thermogravimetric Analysis (TGA). TEM images shows the interaction between the ZNPs and CS polymer and the particles has spherical like structure with average crystallite size of 22 nm and is in good agreement with XRD results. The aim of this study was to investigate the attachment of these nanoparticles with Escherichia coli (E. coli) bacterial outermost cell membrane and their mode of action against these bacterial strains by agar well diffusion method and resazurin dye reduction method. Both the test materials synthesized revealed resistivity against E. coli up to 6 mg/mL. © 2016 Elsevier Ltd. All rights reserved.


Kanagaprabha S.,Kamaraj College | Asvinimeenaatci A.T.,Kamaraj College | Sudhapriyanga G.,Nmss Vellaichamy Nadar College | JemmyCinthia A.,Kamaraj College | And 2 more authors.
Acta Physica Polonica A | Year: 2013

First principles calculations are performed by using Vienna ab initio simulation package within the framework of density functional theory to understand the electronic and structural properties of yttrium, zirconium and niobium hydrides. The equilibrium lattice constant, the bulk modulus, the total density of states and charge density distribution are analyzed in comparison with the available experimental and theoretical data. The X-ray diffraction pattern is also simulated to estimate the lattice constants of these hydrides. The formation energies are computed for rock-salt and fuorite structures using density functional theory. The calculated elastic constants obey the necessary stability conditions. A detailed analysis of the changes in density of states and electron density upon hydride formation has allowed us to understand the formation of these hydrides.


Priyanga G.S.,Nmss Vellaichamy Nadar College | Meenaatci A.T.A.,Nmss Vellaichamy Nadar College | Palanichamy R.R.,Nmss Vellaichamy Nadar College | Iyakutti K.,SRM University
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2013

The structural, electronic and mechanical properties of transition metal hydrides (TMH, TM=Mo, Tc, Ru) are investigated by means of first principles calculation based on density functional theory with generalized gradient approximation. Among the five crystallographic structures that have been investigated, the cubic phase is found to be more stable than the hexagonal ones. A structural phase transition from ZB to WC in MoH, NaCl to NiAs in TcH and NaCl to ZB to NiAs in RuH is also predicted under high pressure. The calculated elastic constants indicate that all the three hydrides are mechanically stable at ambient pressure.


Premanathan M.,Mepco Schlenk Engineering College, Sivakasi | Karthikeyan K.,Mepco Schlenk Engineering College, Sivakasi | Karthikeyan K.,Jeju National University | Jeyasubramanian K.,Mepco Schlenk Engineering College, Sivakasi | Manivannan G.,NMSS Vellaichamy Nadar College
Nanomedicine: Nanotechnology, Biology, and Medicine | Year: 2011

Nanoparticles are increasingly recognized for their utility in biological applications including nanomedicine. The present study investigated the toxicity of zinc oxide (ZnO) nanoparticles toward prokaryotic and eukaryotic cells. Cytotoxicity of ZnO to mammalian cells was studied using human myeloblastic leukemia cells (HL60) and normal peripheral blood mononuclear cells (PBMCs). Antibacterial activity of ZnO was also tested against the Gram-negative bacteria Escherichia coli and Pseudomonas aeruginosa, as well as the Gram-positive bacterium Staphylococcus aureus, and the effect was more pronounced with the Gram-positive than the Gram-negative bacteria. ZnO nanoparticles exhibited a preferential ability to kill cancerous HL60 cells as compared with normal PBMCs. The nanoparticles enhanced ultrasound-induced lipid peroxidation in the liposomal membrane. The work suggested two mechanisms underlying the toxicity of ZnO: (i) involvement of the generation of reactive oxygen species (ROS) and (ii) induction of apoptosis. The work also revealed potential utility of ZnO nanoparticles in the treatment of cancer, for their selective toxicity to cancer cells. From the Clinical Editor: The toxicity of zinc oxide to bacteria was related to the generation of reactive oxygen species and to the induction of apoptosis. Interestingly, these effects were differentially greater in human myeloblastic leukemia cells (HL60) than normal peripheral blood mononuclear cells. © 2011 Elsevier Inc.


Krishnamoorthy K.,Mepco Schlenk Engineering College, Sivakasi | Krishnamoorthy K.,Jeju National University | Manivannan G.,NMSS Vellaichamy Nadar College | Kim S.J.,Jeju National University | And 2 more authors.
Journal of Nanoparticle Research | Year: 2012

Antibacterial activity of MgO nanoparticles (NPs) was evaluated against the Gram-negative bacteria Escherichia coli and Pseudomonas aeruginosa as well as the Gram-positive bacterium Staphylococcus aureus by microtitre plate-based assay incorporating resazurin as an indicator of cell growth. MgO NPs exhibited antibacterial activity with minimal inhibitory concentration of 500 μg/mL against E. coli and 1,000 μg/mL for P. aeruginosa and S. aureus. MgO NPs enhanced ultrasound-induced lipid peroxidation in the liposomal membrane. It was suggested that the mechanism of the antibacterial activity of the MgO NPs relied on the presence of defects or oxygen vacancy at the surface of the nanoparticle which led to the lipid peroxidation and reactive oxygen species generation. © Springer Science+Business Media B.V. 2012.


Sudhapriyanga G.,Nmss Vellaichamy Nadar College | Asvinimeenaatci A.T.,Nmss Vellaichamy Nadar College | Rajeswarapalanichamy R.,Nmss Vellaichamy Nadar College | Iyakutti K.,SRM University
Acta Physica Polonica A | Year: 2014

The electronic properties and structural phase transition of bulk rhodium hydride are analyzed using density functional theory calculations with the generalized gradient approximations. The sequent phase transition is observed in bulk rhodium hydride. The predicted new high pressure phase of rhodium hydride is hexagonal NiAs type. The atomic geometry, adsorption energy, and binding energy of the Rh (111) surface are computed. The calculated surface energy for Rh (111) surface is 1.06349 eV and the maximum adsorption energy is obtained in 6 × 1 phase as 2.8617 eV. The relaxed geometries show that hydrogen has a strong inuence on the interlayer distance.


PubMed | Coimbatore Institute of Technology, Ingsman Energy and Fuel Cell Organization Pvt. Ltd., Materials Research Center and Nmss Vellaichamy Nadar College
Type: | Journal: Carbohydrate polymers | Year: 2016

Proton conducting materials create prime interest in electro chemical device development. Present work has been carried out to design environment friendly new biopolymer electrolytes (BPEs) using cellulose acetate (CA) complex with different concentrations of ammonium nitrate (NH


Puvaneswari S.,Emg Yadava Womens College | Rajeswarapalanichamy R.,Nmss Vellaichamy Nadar College | Sudha Priyanga G.,Nmss Vellaichamy Nadar College
Materials Chemistry and Physics | Year: 2015

The structural stability, electronic structure, elastic and superconducting properties of noble metal nitrides MN2 (M = Ru, Rh, Pd) are investigated in tetragonal (P4/mbm), fluorite (Fm3m), orthorhombic (Pnnm), pyrite (Pa-3) and hexagonal (P6/mmm) phases using first principles calculations. The calculated lattice parameters are in good agreement with other theoretical results. Among the considered structures, RhN2 and PdN2 are found to be most stable in tetragonal structure, whereas RuN2 is stable in fluorite structure. A sequence of structural phase transition is predicted under high pressure in these metal nitrides. The electronic structure reveals that these nitrides are metallic. These metal nitrides are found to be covalent, ionic and metallic in the stable phase. The observations show that these metal nitrides are mechanically stable at ambient condition. The superconducting transition temperatures for RuN2, RhN2 and PdN2 are found to be 1.65 K, 5.01 K and 8.7 K respectively. © 2014 Elsevier B.V. All rights reserved.


Santhosh M.,Nmss Vellaichamy Nadar College | Rajeswarapalanichamy R.,Nmss Vellaichamy Nadar College
Journal of Physics and Chemistry of Solids | Year: 2016

The structural stability of Alkali metal hydrides AMH4 (A=Li, Na; M=B, Al) is analyzed among the various crystal structures, namely hexagonal (P63mc), tetragonal (P42/nmc), tetragonal (P-421c), tetragonal (I41/a), orthorhombic (Pnma) and monoclinic (P21/c). It is observed that, orthorhombic (Pnma) phase is the most stable structure for LiBH4, monoclinic (P21/c) for LiA1H4, tetragonal (P42/nmc) for NaBH4 and tetragonal (I41/a) for NaAlH4 at normal pressure. Pressure induced structural phase transitions are observed in LiBH4, LiAlH4, NaBH4 and NaAlH4 at the pressures of 4 GPa, 36.1 GPa, 26.5 GPa and 46 GPa respectively. The electronic structure reveals that these metal hydrides are wide band gap insulators. The calculated elastic constants indicate that these metal hydrides are mechanically stable at normal pressure. © 2015 Elsevier Ltd.

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