Browsing by Author "Jagadeesan, Saranya"

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    CORROSION INHIBITION AND ADSORPTION BEHAVIOUR OF SOME BIS-PYRIMIDINE DERIVATIVES ON MILD STEEL IN ACIDIC MEDIUM
    (Elsevier, 2017-01) Nagarajan, Anusuya; Jagadeesan, Saranya; Palanisamy, Sounthari; Abdelkader, Zarrouk; Subramanian, Chitra
    The inhibition ability of mild steel in 1 M H2SO4 by bis-pyrimidine derivatives was investigated using chemical and electrochemical techniques. Results obtained indicate that bis-derivatives inhibited the corrosion of mild steel in the acid medium. The inhibition efficiency increases with increase in concentration of bis-derivatives but decrease with rise in temperature. Adsorption of bis-derivatives on the steel surface in 1 M H2SO4 follows the Langmuir adsorption model. Kinetic and thermodynamic parameters such as activation energy, enthalpy, entropy and free energy of activation and adsorption were calculated. Gibbs free energy indicated that the adsorption process is spontaneous. Scanning electron microscopy and atomic force microscopy were used to study morphology of the steel surface. Results obtained from quantum chemical studies show excellent correlations between quantum chemical parameters and experimental inhibition efficiencies using density functional theory (DFT).
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    CORROSION INHIBITION AND ADSORPTION BEHAVIOUR OF SOME BIS-PYRIMIDINE DERIVATIVES ON MILD STEEL IN ACIDIC MEDIUM
    (Elseiver, 2017-01-01) Nagarajan, Anusuya; Jagadeesan, Saranya; Palanisamy, Sounthari; Abdelkader, Zarrouk; S, Chitra
    The inhibition ability of mild steel in 1 M H2SO4 by bis-pyrimidine derivativeswas investigated using chemical and electrochemical techniques. Results obtained indicate that bis-derivatives inhibited the corrosion of mild steel in the acid medium. The inhibition efficiency increases with increase in concentration of bis-derivatives but decrease with rise in temperature. Adsorption of bis-derivatives on the steel surface in 1 M H2SO4 follows the Langmuir adsorption model. Kinetic and thermodynamic parameters such as activation energy, enthalpy, entropy and free energy of activation and adsorption were calculated. Gibbs free energy indicated that the adsorption process is spontaneous. Scanning electron microscopy and atomic force microscopy were used to studymorphologyofthesteelsurface.Resultsobtainedfromquantumchemicalstudiesshowexcellentcorrelations between quantum chemical parameters and experimental inhibition efficiencies using density functional theory (DFT).
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    N-HETEROCYCLES AS CORROSION INHIBITORS FOR MILD STEEL IN ACID MEDIUM
    (Elsevier, 2016-04) Jagadeesan, Saranya; Murugaiyan, Sowmiya; Palanisamy, Sounthari; Kandhasamy, Parameswari; Subramanian, Chitra; Kittusamy, Senthilkumar
    The corrosion behavior of mild steel in 1 M H2SO4 was studied using 2,3-diphenylpyrazine (DP), 2,3-di(furan-2-yl)pyrazine (FP) and 2,3-di(furan-2-yl)quinoxaline (FQ) as inhibitors using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) studies. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) methods were utilized for surface characterization. The results showed that the three inhibitors possess excellent inhibition effect toward mild steel corrosion. The inhibitor molecules are adsorbed on the mild steel surface, blocking the reactive sites available for acid attack. Adsorption of the inhibitor was found to obey Langmuir isotherm. Electronic structure calculations were used to study the inhibition efficiency of the inhibitor molecules on Fe (100) surface. The calculated results are in agreement with the experimental findings.
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    QUINOXALINE DERIVATIVES AS ANTICORROSION ADDITIVES FOR METALS
    (Walter de Gruyter GmbH, 2021-02-04) Jagadeesan, Saranya; Kandikonda, Lavanya; Meduri Haritha, Kiranma; Ram, Subbiah; Abdelkader, Zarrouk; Subramanian, Chitra
    There are collective data about the scope of various corrosion inhibitors viz., polymers, plant extracts, inorganic compounds, ionic liquids, organic molecules with hetero atoms, and π-electron clouds have been reported so far on the corrosion prevention of various metals in various corrosive media. Many reviews of literature related to organic inhibitors have been accounted for their classification, application, and mechanism of their inhibition on metals. A mini-review with specific reference to quinoxaline derivatives is summarized in this manuscript.
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    TETRADENTATESCHIF BASE COMPLEXES OF TRANSITION METALS FOR ANTIMICROBIAL ACTIVITY
    (Arabian Journal for Science and engineering, Springer, 2020) Jagadeesan, Saranya; Suyambulingam, Jone Kirubavathy; Subramanian, Chitra; Abdelkader, Zarrouk; Kulkarni, Kalpana; Kandikonda, Lavanya; Bhamidipati, Ravikiran
    Synthesis of tetradentateSchif base (SB) complexes of Cu(II), Co(II), and Ni(II) was done by the condensation of 2-aminophenol/o-phenylenediamine and terepthaldehyde in an alcohol medium, and the complexes were characterized by utilizing FTIR, LCMS, and UV–visible analysis. From the analytical, electronic, and magnetic data, octahedral geometry has been proposed for all the complexes. The antibacterial studies were studied for the SB ligands and their complexes against Bacillus subtilis 2393, Proteus vulgaris 426, Klebsiella sp., S. aureus 3160, and Escherichia coli 4604. Their antifungal activities were studied against Aspergilusfavus, Aspergillusniger, Cryptococcus neoformans, and Penicilliumchrysogenum. The outcomes revealed that the transition metal complexes revealed good antibacterial and antifungal activities.