F-KCW-Department Publications
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Item A STRUCTURE OF OPEN SETS IN QUAD TOPOLOGICAL SPACES(The International journal of analytical and experimental modal analysis, 2019-11) Sasikala, D; Deepa, MThe main aim of this paper is to present a new set, namely quad j-open set in quad topological space. We discuss the basic properties of quad j-open sets using quad j-interior and quad j-closure. In Addition we study the relationships among quad j-closed, quad b- closed and quad j-regular open in quad topological space.Item SOFT ˆ - GENERALIZED CLOSED SETS AND SOFT ˆ - GENERALIZED OPEN SETS IN SOFT TOPOLOGICAL SPACES(International Journal of Innovative Research in Science, Engineering and Technology, 2015-11) Parvathy, C.R; Deepa, MIn this paper a new class of soft sets called Soft- generalized closed sets and Soft ˆ- generalized open sets in Soft Topological spaces are introduced and studied. This new class is defined over an initial universe and with a fixed set of parameters. Some basic properties of this new class of soft sets are investigated. This new class of Soft - generalized closed sets and Softˆ- generalized open sets widening the scope of Soft Topological spaces and its applications.Item GRAPHENE BASED NANOCOMPOSITES FOR ELECTROCHEMICAL DETECTION OF H2O2(Elsevier B.V, 2019) Yuvashree, S; Balavijayalakshmi, JIn this study, a novel reduced graphene oxide-based nanocomposite electrochemical biosensor for the reliable detection of H2O2 is developed. Reduced graphene oxide-chitosan nanocomposites are successfully prepared by chemical reduction method. XRD, FT-IR, SEM and EDAX analysis are performed to characterize the structural, spectral, morphology and composition of the prepared nanocomposites. The response of the modified electrode to H2O2 is examined by cyclic voltammetry. Under optimal experimental conditions, the RGO-CS biosensor showed outstanding catalytic activity toward H2O2 reduction. The H2O2 reduction peaks are observed about 0.1V. These results confirm that RGO-CS nanocomposites with the high surface area and electrocatalytic activity offer a promising candidate for the detection of H2O2 in biological environment.Item DECORATION AND FUNCTIONALIZATION OF GRAPHENE OXIDE NANOCOMPOSITES FOR SENSING APPLICATIONS(Elsevier B.V, 2019) Ramalakshmi, V; Balavijayalakshmi, JIn the present work, β-cyclodextrin functionalized reduced graphene oxide-silver nanocomposites (GO-β-CD-Ag) are effectively synthesized using wet chemical method. The GO-β-CD nanocomposites are initially produced via hydrazine reduction. The various concentrations (0.002 M, 0.004 M, 0.006 M, 0.008 M and 0.01 M) of silver nanoparticles are decorated on the GO-β-CD surface by the reduction of silver nitrate with sodium borohydrate as a reducing agent. The produced GO-β-CD-Ag nanocomposites are well characterized using XRD, SEM and EDAX analysis. The XRD results firmly established that the β-CD molecules are satisfactorily coated on the rGO surface and also the Ag nanoparticles with an average size of 23 nm are evenly decorated on the GO-β-CD surface. The GO-β-CD-Ag nanocomposites modified glassy carbon electrode is captivated for the selective detection of o-Nitrophenol. Cyclic voltammetry test is employed to determine the presence of o-Nitrophenol compound. The result shows the oxidation and reduction potential for o-Nitrophenol at -0.25 V and -0.5 V respectively, indicating the successful determination of o-Nitrophenol by using the GO-CD-Ag nanocomposite modified electrode.Item IMPACT OF ALUMINIUM ON “STRUCTURAL, OPTICAL AND MORPHOLOGICAL PROPERTIES OF COPPER OXIDE NANOPARTICLES”(Elsevier B.V, 2019) Vidhya priya, P; Balavijayalakshmi, JMetal-oxide-semiconductors have been widely used for the optoelectronic applications like smart windows, solar cells, light emitting diodes and flat panel displays. Among all the metal oxides, copper oxide nanomaterials have a great attention due to its unique properties. It is mostly used in recent research works because of its low cost, rich availability and used in latent applications like antibacterial activities. Aluminium nanoparticles are a good conductor and it enhances the conductivity. Hence an attempt is made to synthesize CuO and Al doped CuO nanoparticles by hydrothermal method. The prepared samples are characterized by XRD, FT-IR, SEM, UV-Vis and PL analysis.The crystallite structures of CuO and Al doped CuO nanoparticles are identified by XRD analysis. The Fourier transform Infrared spectroscopy is used to determine the functional groups present in the prepared nanoparticles. UV-Vis Spectral analysis is performed to determine the band gap energy of the synthesized nanoparticles. PL spectral studies are used to study the optical properties of the nanoparticles. The morphology of the samples is determined by using scanning electron microscopy analysis. The impact of aluminium on structural, optical and morphological properties is investigated. The antibacterial activities of prepared CuO and Al doped CuO nanoparticles are probed.Item IMPACT OF ANNEALING ON STRUCTURAL AND MAGNETIC PROPERTIES OF MANGANESE CO-DOPED MAGNESIUM-COBALT FERRITE NANOPARTICLES(Springer Link, 2017-05-04) Balavijayalakshmi, J; Annie Josphine, CManganese co-doped magnesium-cobalt ferrite nanoparticles (Mg0.4Co0.4Mn0.2Fe2O4) are synthesized by co-precipitation method and are annealed at 130, 600 and 900 °C. The synthesized nanoparticles are characterized using X-ray diffraction (XRD) analysis, FT-IR spectral analysis, Scanning Electron Microscopy (SEM) analysis, Transmission Electron Microscopy (TEM ) analysis and Vibrating Sample Magnetometer (VSM ) analysis. The crystallite size is found to be 17 and 19.6 nm for the samples annealed at 600 and 900 °C respectively. The crystallite size and lattice constant increases as the samples are annealed at higher temperatures. FT-IR analysis confirms the characteristic absorption bands at 590 and 546 cm−1 for tetrahedral sites and 416 cm−1 for octahedral sites. SEM analysis shows uniformly distributed spherical shaped nanoparticles. The microstructure and particle size are analyzed by TEM analysis. The saturation magnetization, remanent magnetization and coercivity increases due to the inclusion of manganese and as the annealing temperature increases. These samples can be used for gas sensing applications.Item EFFECT OF COBALT SUBSTITUTION ON STRUCTURAL AND MAGNETIC PROPERTIES OF MAGNESIUM FERRITE NANOPARTICLES(Springer Link, 2017-05-04) Balavijayalakshmi, J; Sudha, TCobalt substituted magnesium ferrite (Mg(1−x)CoxFe2O4, where x = 0.2, 0.4, 0.6 and 0.8) nanoparticles are prepared by co-precipitation method and samples are annealed at 600 °C. The synthesized nanoparticles are characterized using FT-IR spectral analysis, X-ray diffraction (XRD) analysis, Scanning Electron Microscopy (SEM) analysis, Transmission Electron Microscopy (TEM ) analysis and Vibrating Sample Magnetometer (VSM) analysis. The FT-IR spectra show main absorption bands are shifted to higher values as the concentration of cobalt increases. The average nano-crystallite sizes are found to be in the range 7–9 nm. The SEM micrographs show uniformly distributed granular like structure. TEM indicate the presence of rectangular shaped nanoparticles. The magnetic properties of these samples are studied using Vibrating Sample Magnetometer (VSM). As the magnetic properties are enhanced due to the cobalt substitution the synthesized samples can be used as a gas sensor.Item EFFECT OF DIELECTRIC INTERFACE ON THE TIGHT FOCUSING PROPERTIES OF RADIALLY POLARIZED ANNULAR MULTI GAUSSIAN BEAMS(Springer Link, 2015) Lavanya, M; Prabakaran, K; Rajesh, K. B; Udhayakumar, MA super-length optical needle (44�) of strong transversally polarized field with homogeneous intensity along the optical axis and sub-diffraction beam size (0.48�) can be generated by focusing a radially polarized beam through a dielectric interface with an annular high numerical aperture (NA) lens. Moreover, the focal shifts induced by the mismatch of the refractive indices across the interface has been found. The dependence of focal shifts and spot size of the focused field on the probe depth and NA of the objective is also analyzed in detail by numerical calculations using vector diffraction theory. Such kind of non-diffracting optical needle may have applications in atom-optical experiments, such as with atom trap and atom switches.Item EFFECT OF CONCENTRATION ON DIELECTRIC PROPERTIES OF CO-CU FERRITE NANO PARTICLES(Elsevier B.V, 2013) Balavijayalakshmi, J; Suriyanarayanan, N; Jayaprakash, R; Gopalakrishnan, VNano-sized Cobalt ferrites doped with copper as an additive element CoxCu(1-x)Fe2O4 (where x =0,0.2,0.4,0.6,0.8,1) are synthesized using co-precipitation method. Cobalt-Copper ferrite samples sintered at 600○C are subjected to X-ray diffraction to calculate the average particle size and lattice parameters using Debye – Scherrer formula. The FT-IR spectra of these samples are recorded to ensure the presence of the metallic compounds. The variations of dielectric constant and dielectric loss for all the samples are studied as a function of frequency. The crystalline structure of composite nano particles are characterized by Transmission Electron Microscope (TEM).Item ACTIVE-POLYPHENOLIC-COMPOUNDS-RICH GREEN INHIBITOR FOR THE SURFACE PROTECTION OF LOW CARBON STEEL IN ACIDIC MEDIUM(World Scientific Publishing Co Pte Ltd, 2019) ILL-MIN, CHUNG; VENKATESAN, HEMAPRIYA; PONNUSAMY, KANCHANA; NATARAJAN, ARUNADEVI; SUBRAMANIAN, CHITRA; SEUNG-HYUN, KIM; MAYAKRISHNAN, PRABAKARANEco-friendly biodegradable Rhododendron schlippenbachii (R. schlippenbachii) green inhibitors, R. schlippenbachii methanolic (RSMeOH) extract, which can effectively reduce low carbon steel corrosion rate, were investigated using weight-loss and electrochemical (electrochemical impedance spectroscopy) techniques. The inhibitors exhibited higher efficiency by retarding the corrosion process in 1M H2SO4 and the inhibition efficiency is found to be concentration dependent. The reactivity of the predominant phytochemical components of the extract are analyzed. The adsorption of inhibitors on low carbon steel is followed the Langmuir adsorption. The protective inhibitor film formed on the metal surface was confirmed by SEM and AFM techniques.