j) 2016 - 39 Documents

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Author: search.filters.author.Chitra, S

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    ACENAPHTHO[1,2-B]QUINOXALINE AND ACENAPHTHO[1,2-B]PYRAZINE AS CORROSION INHIBITORS FOR MILD STEEL IN ACID MEDIUM
    (Elsevier, 2016-01) Saranya, J; Sounthari, P; Parameswari, K; Chitra, S
    The corrosion inhibition of mild steel in 1 M H2SO4 using acenaphtho[1,2-b]quinoxaline and acenaphtho[1,2-b]pyrazine at 303–333 K have been investigated. The study was performed using weight loss method, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). Polarization measurements proved that the inhibitors behave as mixed-type. EIS data showed that the charge transfer resistance of mild steel increases in acid solution containing inhibitors. The surface morphology was evaluated using scanning electron microscope (SEM), atomic force microscopy (AFM) techniques. Density functional theory (DFT) at the B3LYP/6-311G(d,p) basis set level was performed. Excellent correlation was found between experimental and theoretical results.
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    SYNTHESIS AND CORROSION INHIBITION STUDY OF BENZOTHIAZEPINE DERIVATIVES ON MILD STEEL IN ACID MEDIUM
    (Oriental Journal of Chemistry, 2016-04-12) Sasikala, T; Parameswari, K; Chitra, S
    2-ethoxy-4-(4-phenyl-2, 3-dihydro-1, 5-benzothiazepin-2-yl) phenol (EPBTZ) and 2-(4-methoxyphenyl)-4-phenyl-2, 3-dihydro-1, 5-benzothiazepine (MPPBTZ) were synthesized by the condensation reaction between o-aminothiophenol and chalcone. The synthesized benzothiazepines were characterized by FTIR spectra. Their corrosion inhibition property on mild steel in sulphuric acid medium was investigated by weight loss and electrochemical techniques. Scanning electron microscopic studies were employed to examine the surface morphology of the inhibited and uninhibited metal samples. The compound EPBTZ revealed good corrosion protection property than MPPBTZ at all the temperatures studied. Electrochemical studies showed that the inhibitors behave as mixed type inhibitor retarding both cathodic and anodic corrosion reaction by forming an adsorbed protective layer.
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    CO(II) COMPLEX OF 2-AMINO-6-METHYLBENZOTHIAZOLE: SYNTHESIS, STRUCTURE AND BIOLOGICAL EVALUATION
    (Indian Journal of Chemistry, 2016-11) Jone Kirubavathy, S; Velmurugan, R; Karvembu, R; Bhuvanesh, N S P; Enoch, I V M V; Mosae Selvakumar, P; Chitra, S
    Cobalt(II) complex of 2-amino-6-methylbenzothiazole has been synthesized and characterized by various physicochemical methods. The ligand 2-amino-6-methylbenzothiazole acts as monodentate, neutral ligand with N as the donor site. The molecular structure of the title complex has been determined by single crystal X-ray diffraction studies. The Co(II) complex shows significant antioxidant activity against DPPH radical. The complex shows cytotoxicity with a IC50 value of 14.12 µM against MCF-7 cell line. In addition, the complex shows good antimicrobial and anti-tuberculosis activities against various microbes and mycobacterium tuberculosis respectively. DNA binding of the title complex has been investigated by absorption spectroscopic technique, which reveals that the complex acts as minor groove binder. These results have been validated by molecular docking studies
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    CORROSION INHIBITION PROPERTY OF POLYESTER–GROUNDNUT SHELL BIODEGRADABLE COMPOSITE
    (Elsevier, 2016-12) Sounthari, P; Kiruthika, A; Saranya, J; Parameswari, K; Chitra, S
    The use of natural fibers as reinforcing materials in thermoplastics and thermoset matrix composites provide optimistic environmental profits with regard to ultimate disposability and better use of raw materials. The present work is focused on the corrosion inhibition property of a polymer matrix composite produced by the use of groundnut shell (GNS) waste. Polyester (PE) was synthesized by condensation polymerization of symmetrical 1,3,4-oxadiazole and pimelic acid using sodium lauryl sulfate as surfactant. The polyester–groundnut shell composite (PEGNS) was prepared by ultrasonication method. The synthesized polyester–groundnut shell composite was characterized by FT-IR, TGA and XRD analysis. The corrosion inhibitory effect of PEGNS on mild steel in 1 M H2SO4 was investigated using gravimetric method, electrochemical impedance spectroscopy, potentiodynamic polarization, atomic absorption spectroscopy and scanning electron microscopy. The results showed that PEGNS inhibited mild steel corrosion in acid solution and indicated that the inhibition efficiency increased with increasing inhibitor concentration and decrease with increasing temperature. The composite inhibited the corrosion of mild steel through adsorption following the Langmuir adsorption isotherm. Changes in the impedance parameters Rt, Cdl, Icorr, Ecorr, ba and bc suggested the adsorption of PEGNS onto the mild steel surface, leading to the formation of protective film.
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    SYNTHESIS, CHARACTERIZATION, SINGLE-CRYSTAL XRD, AND BIOLOGICAL EVALUATION OF NICKEL(II) SALEN SULFADIAZINE COMPLEX
    (Taylor & Francis Online, 2016) Jone Kirubavathy, S; Velmurugan, R; Tamilarasan, B; Karvembu, R; Bhuvanesh, N S P; Chitra, S
    Nickel(II) salen sulfadiazine complex was prepared and characterised by the spectral studies such as FT-IR, UV-Vis and NMR, and single-crystal XRD. The nickel(II) complex was screened for in vitro antimicrobial activities against various test organisms Aeromonas hydrophila, Serratia marcescens, Bacillus licheniform, Pseudomonas aeruginosa, Acinetobacter baumanii, Aspergillus niger, and Candida albicans by the well diffusion method and in vitro anticancer activity against the human breast cancer cell line HeLa. The NiO obtained by the thermal decomposition of Ni (salen) sulfadiazine complex was characterised using TEM images and their SAED pattern