m) 2013 - 19 Documents

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    INHIBITION OF MILD STEEL CORROSION IN THE PRESENCE OF P-NITROPHENYL-2- IMIDAZOLINE
    (NACE - International Corrosion Conference Series, 2013-03-17) Nalini, D; Rajalakshmi, R
    p-nitrophenyl-2-imidazoline (PNP2I) was synthesized in the laboratory and characterized by Fourier Transform Infrared Spectroscopy (FTIR) spectra and evaluated as a corrosion inhibitor for mild steel in 1M Hydrochloric acid and 0.5M Sulphuric acid by weight loss method and electrochemical studies. Results obtained revealed that PNP2I was a very good inhibitor and behaved better in 0.5M H2SO4 than in 1M HCl. Potentiodynamic polarization curves showed that PNP2I is a mixed type inhibitor. The ability of the studied inhibitor to inhibit the corrosion of mild steel was due to the presence of two hetero nitrogen atoms on the imidazoline ring and the phenyl ring attached to the imidazoline ring. The adsorption of PNP2I on the mild steel surface in both acidic media followed the Langmuir adsorption isotherm. Surface analyses were also carried out, to establish the mechanism of the corrosion inhibition of mild steel in acidic solutions. Good inhibition efficiency was evidenced in both acid solutions, furnishing an inhibition efficiency of 80 %.
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    HIGH CAPACITY SNXSBYCUZ COMPOSITE ANODES FOR LITHIUM ION BATTERIES
    (Elsevier, 2013-05) Nithya, C; Sowmiya, T; Vijaya Baskar, K; Selvaganeshan, N; Kalaiyarasi, T; Gopukumar, S
    To increase the volumetric discharge capacity of negative electrode for rechargeable lithium batteries, a composite anode SnxSbyCuz has been synthesized by using high energy mechanical ball milling method. The synthesized composite anode materials have been characterized by X-ray diffraction and SEM analysis. The charge/discharge characteristics of the fabricated coin cells have been evaluated galvanostatically in the potential range 0.01–2 V using 1 M LiPF6 in 1:1 EC/DEC as electrolyte. Results indicate that the composition with 90 wt% Sn, 8 wt% Sb and 2 wt% Cu delivers an average discharge capacity of 740 mAh g−1 over the investigated 50 cycles which is a potential candidate for use as an anode material for lithium rechargeable cells.
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    COMPOSTING OF COIRPITH AND ITS EFFECT ON GROWTH AND BIOCHEMICAL CONTENTS OF HELIANTHUS ANNUUS L.
    (Plant Archives, 2013) Sunitha Kumari, K; Meerabai, R S; Padmadevi, S N
    Continuous use of inorganic fertilizers lead to accumulation of injurious heavy metal ions, polluting the soil with precipitates of hydroxides, carbonates, sulphides and sulphates. These necessitate organic amendments to soil for environmental safety and soil health. One of the organic amendments is coir pith, but raw coir pith cannot be used as such due to its high C:N ratio. Present investigation was therefore carried out to find out a suitable technology to compost coirpith and to assess its efficacy on the growth and biochemical contents of an economically important plant (Helianthus annuus L.). For this, precomposting of coir pith (CP) by EM (Effective Micro organisms) technology followed by subsequent vermicomposting was carried out. The earthworm species used for the experimental study was Eudrillus eugeniae (Kingberg) and Eisenia foetida (Savigny). The extent of composting was adjudged based on the CO2 evolution, C:N ratio, macro and micro nutrients levels of composted coir pith (CCP) after different treatments. There was an increase in CO2 evolution and the levels of macro and micro nutrients in the coir pith composted by both the worms, without much difference when compared. However, C:N ratio was higher in the vermicomposted coir pith, when E. eugeniae was used. The composted coir pith (CCP) was amended to the soil in the plots at the rate of 5 t h-1, 10 t h-1 and 15 t h-1. The control plots were left unamended. This CCP was further used to find out its influence on the growth and yield of Helianthus annuus L. such as seed germination, root length, shoot length, vigour index, plant height, carbohydrate and protein contents of the leaves were assessed. It was found that CCP showed a positive influence on the above studied parameters in the fields amended with 15 t h-1. The iodine, saponification values of the seeds was more in the plants grown in the fields amended with 15 t h-1 of CCP, the oil content was more in 5 t h-1 of CCP and the plants grown in the control plot recorded higher fatty acid level.
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    COMPOSTING OF COIR PITH BY THE MUSHROOMS- PLEUROTUS FLORIDA (FR.) KUMM AND HYPSIZYGUS ULMARIUS (BULL. FR.) REDH
    (Plant Archives, 2013) Sunitha Kumari, K; Meerabai, R S; Padmadevi, S N
    Coir pith is a recalcitrant waste product of coir industry. Application of biotechnology for conversion of coir pith into useful biomass (mushroom) would not only solve the waste disposal problem, but also enhance the dietary status of the common man. The present experiment was designed to find out the biological efficiency of the mushroom to utilize coir pith as its substrate for growth. Two different types of mushrooms namely, Pleurotus florida (Fr.) Kumm and Hypsizygus ulmarius (Bull. Fr.) Redh were used for the study. The influence of the mushrooms on the physico-chemical characteristics of the coir pith, yield of the mushroom and its biological efficiency, along with the biochemical content of mushrooms were assessed. Coir pith (CP) composted by Pleurotus florida showed a reduction in pH, EC, bulk density, particle density, lignin, cellulose, hemi-cellulose and phenol content when compared to the CP composted by Hypsizygus ulmarius except for pore space and moisture content. There was drastic change in the C:N ratio, which narrowed down from 113.1:1 to 33.8:1. Likewise macro and micronutrients levels, which were analyzed did not show any significant difference among the CP composted by both the mushrooms except for iron. The maximum number of fruiting body was produced by Pleurotus florida (29/ bed) and Hypsizygus ulmarius (16/bed). Higher content of carbohydrate and protein was recorded in Pleurotus florida. The biological efficiency was comparatively higher in Pleurotus florida (16.52%) than Hypsizygus ulmarius (10.00%).
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    CHELATES OF SCHIFF BASES DERIVED FROM THIOCARBOHYDRAZIDE: SYNTHESIS AND APPLICATIONS
    (Research Journal of Pharmaceutical, Biological and Chemical Sciences, 2013) Parameswari, K; Chitra, S; Kiruthika, A; Nagajothi, A
    Complexes of Fe(III), Co(II) and Cu(II) with a bidentate Schiff base ligand derived from 2-hydroxy-1-naphthaldehyde and thiocarbohydrazide have been synthesized. The complexes have been characterized by IR, UV, magnetic susceptibility, molar conductance and thermal studies. From the data, an octahedral geometry has been suggested for Fe(III) and Co(II) complexes and square planar geometry for Cu(II) complex. 3D molecular modeling and energies of all complexes are furnished and the analysis for bond length has been carried out for one of the complex. The complexes have been tested for their antimicrobial and nuclease activity.
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    CORROSION INHIBITION OF MILD STEEL IN ACIDIC MEDIA BY 5′-PHENYL-2′,4′-DIHYDROSPIRO[INDOLE-3,3′-PYRAZOL]-2(1H)-ONE
    (Hindawi Publishing Corporation, 2013) Jannathul Firdhouse, M; Nalini, D
    The inhibition effect of -phenyl-,-dihydrospiro[indole-3,-pyrazol]-2(1H)-one (SPAH) on mild steel corrosion in 1 M HCl and 0.5 M H2SO4 has been studied by weight loss, effect of temperature, electrochemical techniques, and quantum chemical studies. The inhibition efficiency increases with increasing concentration of inhibitor but decreases with increase in temperature. The adsorption of inhibitor on mild steel surface has been found to obey Langmuir and Temkin’s adsorption isotherm. Potentiostatic polarization results revealed that SPAH acts as mixed type inhibitor. The values of activation energy (), free energy of adsorption (), enthalpy of adsorption (), and entropy of adsorption () were calculated. Surface analysis (SEM) was also carried out to establish the mechanism of inhibitor on mild steel corrosion in acid medium. Quantum chemical studies using DFT were employed to explain the experimental results obtained in this study and to further give insight into the inhibition action of SPAH on the mild steel surface.
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    SYNTHESIS OF CEO2 NANORODS WITH IMPROVED PHOTOCATALYTIC ACTIVITY: COMPARISON BETWEEN PRECIPITATION AND HYDROTHERMAL PROCESS
    (Springer Link, 2013) Sabari Arul, N; Mangalaraj, D; Tae Whan, Kim; Pao Chi, Chen; Ponpandian, N; Meena, P; Yoshitake, Masuda
    The main purpose of this article is to examine the surface free cerium oxide (CeO2) nanostructures prepared by different methods. CeO2 nanoparticles and nanorods were prepared by two different methods including precipitation and hydrothermal process. In precipitation process the nanoparticles were prepared at room temperature, while in hydrothermal process nanorods were prepared at high temperature. X-ray and electron diffraction analysis show the presence of CeO2. X-ray photoelectron spectroscopy (XPS) confirms the presence of CeO2 in both nanostructures. From BET, the specific surface area of nanorods (110 m2g−1) is found to be higher than nanoparticles (52 m2g−1). Also, the effect of morphology on their photodegradation of azo dye acid orange 7 (AO7) under UV–Visible light has been successfully investigated. The results show that the CeO2 nanorods synthesized by hydrothermal method have high surface area and exhibit improved performance in the photocatalytic activity.
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    INVESTIGATION OF THE INHIBITIVE EFFECT OF 1,8- NAPHTHYRIDINE DERIVATIVES ON CORROSION OF MILD STEEL IN ACIDIC MEDIA
    (Rasayan Journal of Chemistry, 2013-03) Kalaiselvi, K; Nijarubini, V; Mallika, J
    In the present investigation 1,8-naphthyridine compounds have been synthesized and its inhibition action on the corrosion of mild steel in 1M HCl was investigated by corrosion weight loss test, electrochemical impedance spectroscopy, potentiodynamic polarization and solution analysis techniques (AAS). Polarization measurementsclearly indicate that the examined compounds acts as mixed inhibitors and the inhibition efficiency increases with inhibitor concentration. Changes in the impedance parameters (Rct and Cdl) are indicative of the adsorption of naphthyridine compounds on the metal surface, leading to the formation of protective film. Solution analyses were carried out by atomic absorption spectroscopy, which shows decreased dissolution of iron in the presence of inhibitors. Physical adsorption is proposed for the inhibition and the process followed the Langmuir adsorption isotherm.
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    ANTIDIABETIC, ANTIHYPERLIPIDEMIC AND ANTIOXIDANT EFFECT OF ETHANOLIC EXTRACT OF CURCUMA RAKTAKANTHA J.K. MANGALY & M. SABU ON STREPTOZOTOZIN INDUCED DIABETIC RATS
    (Academic Sciences, 2013-06-02) Rajarathinam, Natarajan Inthirakanthi; Nungampakkam, Subramanian Malathy; Nagarajan, Anusuya
    To evaluate the antidiabetic potential of Curcuma raktakantha (CR) rhizome using in vitro inhibitory assays and streptozotozin (STZ) induced diabetic animal model.
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    DISCOVERING TAMIL WRITER IDENTITY USING GLOBAL AND LOCAL FEATURES OF OFFLINE HANDWRITTEN TEXT
    (International Review on Computers and Software, 2013) Thendral, T; Vijaya, M S; Karpagavalli, S
    Writer identification is the process of identifying the individual based on their handwriting. Handwriting exhibits behavioral characteristics of an individual and has been considered as unique. The style and shape of the letters written vary slightly for same writer and entirely different for different writers. Also alphabets in the handwritten text may have loops, crossings, junctions, different directions etc. Hence accurate prediction of individual based on his/her handwriting is highly complex and challenging task. This paper proposes a new model for discovering the writer’s identity based on Tamil handwriting. Writer identification problem is formulated as classification task and a pattern classification technique namely Support Vector Machine has been employed to construct the model. It has been reported about 93.8% of prediction accuracy by RBF kernel based classification model.