d) 2022 - 98 Documents

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Author: search.filters.author.Arunadevi, N

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    NEW EPOXY-NANO METAL OXIDE-BASED COATINGS FOR ENHANCED CORROSION PROTECTION
    (Elsevier, 2022-02-15) Arunadevi, N; Swathika, M; Mehala, M; Ranjith Kumar, E; Tahani M, Bawazeer; Moataz, Morad; Kholood, Alkhamis; Samar Y, Al-nami; Nashwa M, El-Metwaly
    Aminoguanidium-1-naphthoate and its Ni(II) and Co(II) complexes were synthesized and characterized by spectral, thermal and structural methods. By using these compounds as precursors, epoxy coated ligand, NiO and CoO has been prepared by Sol-gel method in order to protect the corrosion on mild steel substrate. Resistance and protection against corrosion of the synthesized sample was studied in 3 M HCl, 1.5 M H2SO4, and 0.5 M H3PO4 by weight loss measurements, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The surface and structural morphological studies of epoxy-metal oxides were investigated using powder XRD and SEM analysis. The corrosion protection efficiency of epoxy -NiO and epoxy -CoO nanoparticles film on mild steel is high than epoxy-L. The molecular docking study against 3T88 and 1Y2T protein with synthesized compound was performed to study the interactions responsible for anti-bacterial activity against S. aureus and E. coli.
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    METAL NANOCOMPOSITES FOR ADVANCED FUTURISTIC BIOSENSING APPLICATIONS
    (Elsevier, 2022-02-15) Arunadevi, N
    Nano biosensors is a device with excellent sensing property having dimension in the range of 100 nm. Biosensors will recognize the biological molecules and have heterogeneous type of reaction with analyte. Biosensors are indispensable in medical field for metabolite measurement, monitoring diabetes and biomolecules due to its reproducibility and stability. Metal nanocomposite as biosensors have proven attention to biotechnologist due to its attractive properties. The properties include large surface area which will enhance immobilization of bio recognizers and receptor molecule, improved electro chemical properties and good biocompatibility. This review article covers the classification, characteristics and current development of biosensors with different nano composite materials.
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    INFLUENCE OF CARBOXYLIC ACIDS ON STRUCTURAL, OPTICAL, THERMAL, AND ELECTRICAL PROPERTIES OF FERROELECTRIC GLYCINE PHOSPHITE SINGLE CRYSTALS
    (Springer Link, 2022-06-28) Shanmuga Sundari, S; Arunadevi, N; Kanchana, P; Meena, P; Ranjith Kumar, E; Hosam O, Elansary; Eman A, Mahmoud; Shaimaa A. M, Abdelmohsen
    Glycine phosphite (GPI), a semi-organic nonlinear optical NLO material, has been synthesized at room temperature. Slow evaporation method has been adopted to grow the single crystals of GPI and acetic acid, benzoic acid, formic acid, oxalic acid, and succinic acid-doped GPI crystals. The synthesized crystals are exposed to x-ray diffraction XRD, Fourier transform infrared (FTIR), and differential scanning calorimetry analysis DSC. The effects of doping on the structural parameters are analyzed. All the functional groups are identified by the corresponding peaks in the FTIR spectra. The UV–Vis spectrum shows that the materials have good optical transparency. The energy band gap values are found to be in the range of 5.1–5.4 eV for all the crystals. The mechanical stability of the grown crystals changes with different doping acids. The thermal studies were also affected by the addition of doping acids to the GPI crystal. Growth patterns and defect formation were studied by means of chemical etching. The dielectric constant and loss were evaluated from 300 to 410 K. It confirms that the dielectric constant value of GPI is higher than the acid-doped crystals.
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    NATURAL CITRIC ACID ASSISTED SYNTHESIS OF CUO NANOPARTICLES: EVALUATION OF STRUCTURAL, OPTICAL, MORPHOLOGICAL PROPERTIES AND COLLOIDAL STABILITY FOR GAS SENSOR APPLICATIONS
    (Elsevier, 2022-09-15) Vandamar Poonguzhali, R; Ranjith Kumar, E; Arunadevi, N; Srinivas, Ch.; Mohamed E, Khalifa; Sraa, Abu-Melha; Nashwa M, El-Metwaly
    In the present research, natural ingredient lemon juice was selected as a fuel to prepare nanoparticles under combustion method. The structural properties of nanophase copper oxide nanoparticles (CuO NPs) synthesized by a natural citric acid aided combustion process were studied using transmission electron microscopy (TEM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). According to the SEM and TEM images, the manufactured product is made up of spherical nanoparticles with a limited size distribution. According to the XRD pattern, the average crystallite size of monoclinic structured CuO nanoparticles was 10.4 nm for as-prepared samples and 20.5 nm for annealed samples. The zeta potential value confirms the negative surface charge of the samples and the values show the excellent stability (-58.1 mV) for as-prepared sample and the good particles stability (-38.3 mV) was exhibited for heat treated sample. The optical band gap of CuO nanoparticles is 2.01 eV and it decreases to 1.28 eV under heat treatment. The sensitivity and selectivity of the samples were tested under different operating temperatures (OT) and different gas concentrations (GC). Recovery-response time plots confirm that the CuO nanoparticles are promising materials for gas sensor fabrications.
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    CITRUS LIMON ASSISTED GREEN SYNTHESIS OF MGO NANOPARTICLES: EVALUATION OF PHASE, FUNCTIONAL GROUPS, SURFACE MORPHOLOGY, THERMAL STABILITY AND COLLOIDAL STABILITY
    (Elsevier, 2022-10-01) Vandamar Poonguzhali, R; Srimathi, M; Ranjith Kumar, E; Arunadevi, N; Hosam O., Elansary; Ashraf A.A, Abdelbacki; Shaimaa A.M, Abdelmohsen
    Citrus limon (the common lemon juice) assisted green combustion was used to create MgO nanostructures. The powder was heat treated for 3 h at 350 °C, and the as-synthesized and heat treated MgO nanostructures were tested by various techniques to investigate their phase composition, structure, thermal stability, colloidal stability, surface morphology, and antimicrobial activities. XRD was performed to study the single-phase cubic structure of MgO nanostructures, and the XRD results confirmed that the sizes of the MgO nanostructures are in the nanoscale range. The average crystallite sizes for as-synthesized and heat-treated samples are 7.8 nm and 19.2 nm, respectively. The functional groups in the experiment were examined using FTIR in the 400–4000 nm range. Thermal analysis of the MgO nanostructures were recorded through TG-DTA and the results confirm the MgO NPs thermally decomposed at 359.77 °C and 361.86 °C. The colloidal stability of the samples was tested using Zeta potential, it confirms that both samples are stable. The external morphology of as-synthesized and heat-treated samples were visualized through SEM. It confirms that the as-synthesized and heat treated MgO samples are nanostructures. The elemental analysis confirms the presence of Mg and O in both samples. The antimicrobial activity of MgO nanostructures tested by plate count mothed and the heat-treated sample exhibits noticeable antimicrobial performance against G-positive and G-negative bacteria.