2.Article (07)

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    EVALUATION OF CORROSION RESISTANCE OF 5-PYRAZOLONES ON MILD STEEL IN ACID MEDIA
    (Asian Journal of Chemistry, 2011) Nalini, D; Shamitha, Begum; Manimekalai, A; Kousalya, S
    The effects of 5-pyrazolone derivatives have been investigated as corrosion inhibitor for mild steel in 1M HCl and 1M H2SO4 using electrochemical and non-electrochemical techniques. The efficiency of inhibitor increases with increase in inhibitor concentration and decreases with rise in temperature. The adsorption of these inhibitors on mild steel surface has been found to obey Langmuir isotherm. Potentiodynamic polarization results show that the inhibitors behave as a mixed type. Some thermodynamic parameters such as enthalpy (ΔH°), entropy (ΔS°) and free energy (ΔG°) have been calculated.
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    ADSORPTION AND INHIBITIVE PROPERTIES OF TRIAZOLOPYRIMIDINE DERIVATIVES IN ACID CORROSION OF MILD STEEL
    (Hindawi, 2011) Parameswari, K; Chitra, S; Kavitha, S; Rajpriya, J; Selvaraj, A
    Inhibitive and adsorption properties of synthesized triazolo- pryimidine derivatives (P1, P2 & P3 ) for the corrosion of mild steel was investigated using weight loss and electrochemical methods. Inhibition efficiency increased as the concentration of the inhibitor increased but decreased with increase in temperature. The triazolopyrimidines were found to act as adsorption inhibitors for the corrosion of mild steel. The adsorption mechanism of the triazolopyrimidine was found to be physisorption, spontaneous and exothermic. Also the adsorption followed Langmuir adsorption isotherm. polarisation studies showed that the inhibitors behave as cathodic type.
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    ORTHO-CHLOROPHENYL-2-IMIDAZOLINE AS CORROSION INHIBITOR FOR MILD STEEL IN ACIDIC MEDIA
    (Asian Journal of Chemistry, 2011) Nalini, D; Rajalakshmi, R
    Present study involved the synthesis of o-chlorophenyl-2-imidazoline (OCP2I) and its inhibition behaviour on mild steel corrosion in sulphuric acid and hydrochloric acid media, using weight loss method and electrochemical methods. The results of weight loss method revealed that the inhibitor shows a maximum efficiency of 84.55 % in H2SO4 at 200 ppm and 91.42 % in HCl medium at 120 ppm of concentration. Thermodynamic parameters indicated physisorption mode of adsorption of o-chlorophenyl-2-imidazoline follows Langmuir and Temkin adsorption isotherms. Potentiodynamic polarization and impedance studies were conducted to investigate the mechanism of the inhibition and the present system follows mixed mode of inhibition
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    CORROSION INHIBITION OF MILD STEEL IN ACID SOLUTION BY 3,4,5-TRIMETHOXYPHENYL-2-IMIDAZOLINES
    (Hindawi, 2011) Nalini, D; Rajalakshmi, R; Subashini, S
    A heterocyclic imidazoline, 3,4,5-trimethoxyphenyl-2-imidazolines (TMP2I) was tested for its corrosion inhibition in 0.5 M H2SO4 and 1 M HCl using weight loss, Tafel polarisation and electrochemical impedance techniques. The results show that the inhibition efficiency increases with the increase in concentration of TMP2I and the higher efficiency of about 98% is obtained in both the acid media at 20 ppm. The adsorption of TMP2I obeys Langmuir adsorption isotherm and occurs spontaneously. Cathodic and anodic polarization curves of mild steel in the presence of different concentrations of TMP2I at 30 0C reveal that it is a mixed type of inhibitor. Electrochemical impedance studies reveal that the system follows mixed mode of inhibition. The surface morphology of the mild steel specimens was evaluated using SEM images
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    A SIMPLE AND FACILE METHOD TO SYNTHESIZE CO3O4 NANOPARTICLES FROM METAL BENZOATE DIHYDRAZINATE COMPLEX AS A PRECURSOR
    (Elsevier, 2011-05-31) Kavitha, Thangavelu; Parameswari, K; Kuppusamy, K; Yuvaraj, Haldorai
    This report describes the novel synthesis of cobalt oxide (Co3O4) nanoparticles from corresponding metal benzoate dihydrazinate complex as a precursor followed by thermal decomposition. Transmission electron microscopy (TEM) revealed nearly uniform nanoparticles with an average particle size of around 20 nm. X-ray diffraction (XRD) and selected-area electron diffraction (SAED) demonstrated that the nanoparticles were composed of pure cubic phase polycrystalline Co3O4. The nanoparticles were also confirmed by Raman spectroscopy. In principle, this simple and inexpensive synthetic procedure can be employed to prepare other transition metal oxide nanoparticles.
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    EVALUATION OF QUINOXALINES AS CORROSION INHIBITORS FOR MILD STEEL IN ACID ENVIRONMENT
    (Elsevier, 2011-10) Chitra, S; Parameswari, K; Vidhya, M; Kalishwari, M; Selvaraj, A
    Novel Quinoxaline derivatives have been synthesised and evaluated as corrosion inhibitors for mild steel in 1M sulphuric acid by weight loss, gasometry and electrochemical techniques. Results obtained showed that they are efficient corrosion inhibitors. Tafel polarisation studies revealed that the quinoxalines were mixed type inhibitors but slightly cathodic in nature. The adsorption of all the quinoxalines on the mild steel surface from the acid solution has been found to obey Langmuir adsorption isotherm. Addition of halide ions synergistically enhanced the inhibition of the quinoxalines.
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    A FACILE APPROACH TO THE SYNTHESIS OF HIGH-QUALITY NIO NANORODS: ELECTROCHEMICAL AND ANTIBACTERIAL PROPERTIES
    (Royal Society of Chemistry, 2011-09-05) Thangavelu, Kavitha; Haldorai, Yuvaraj
    This report describes a new approach to successfully synthesize high-quality nickel oxide (NiO) nanorods with an average diameter of about 60 nm and a length of less than one micrometre viathermal decomposition of a precursor complex nickel benzoate dihydrazinate at 100 °C. The structural features, crystallinity, purity and morphology of the as-synthesized NiO nanorods were investigated by Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), selected area electron diffraction (SAED) and transmission electron microscopy (TEM). The electrochemical property of the as-synthesized NiO nanorods was investigated to determine their suitability as anode materials for lithium-ion batteries. The nanorod electrode exhibited better reversibility and high capacity. In addition, the nanorods showed good antibacterial properties. The magnetic measurement demonstrated that the NiO nanorods are ferromagnetic and may be used in the fields of MR imaging and magnetic drug delivery.