i) 2017 - 37 Documents
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Item 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, ChitraThe 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).Item COMPARISON OF THE INHIBITION PROPERTY OF QUINOXALINE DERIVATIVE ON MILD STEEL IN 1.5M H2SO4, 3M HCL AND 1M H3PO4(Journal of materials and Environmental Sciences, 2017) Saranya, J; Sounthari, P; Chitra, SCorrosion inhibition of mild steel in 1.5M H2SO4, 3M HCl and 1M H3PO4 was investigated in the absence and presence of different concentrations of quinoxaline derivative namely 2,3-di(furan-2-yl)quinoxaline(FQ). Weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements were employed. Impedance measurements showed that the charge transfer resistance increased and double layer capacitance decreased with increase in the inhibitor concentration. Potentiodynamic polarization study showed that the inhibitor acted as mixedtype inhibitors in all the three acids.Item ELECTRODEPOSITION OF WO3 NANOSTRUCTURED THIN FILMS FOR ELECTROCHROMIC AND H2S GAS SENSOR APPLICATIONS(Elsevier, 2017-09-30) Poongodi, S; Palaniswamy, Suresh Kumar; Mangalaraj, D; Ponpandian, N; Meena, P; Yoshitake, Masuda; Chongmu, LeeIn this work, Vertically oriented WO3 nanoflakes array films was synthesized via the template free facile electrodeposition method at room temperature. WO3 nanoflakes arrays was adopted as an effective cathode electrode material in the electrochemical devices structure. The WO3 material exhibits superior electrochromic performance shows a larger optical modulation (68.89% at 550 nm), faster response time (tb = 1.93 s, tc = 2.87 s), a higher coloration efficiency of about 154.93 cm2 C−1 and with excellent cyclic stability over 2000 cycles without any degradation. Futhermore, WO3 nanoflakes array film was used for the detection of H2S gas that showed excellent response. A considerable increase in porosity and high surface roughness could be conducive for such an excellent and superior electrochromic characteristic as well as gas sensing performances. These results indicates that fabricated WO3 nanoflakes array film by a simple strategy holds a great promise for potential multifunctional applications such as smart windows, gas sensors and optical sensors.Item TRANSITION METAL COMPLEXES OF 3,5-DIHYDROXY-2-NAPHTHOIC ACID AND ITS NANO METAL OXIDES: SYNTHESIS AND CHARACTERIZATION(Asian Journal of Chemistry, 2017-06-12) Arunadevi, Natarajan; Kanchana, PonnuswamySynthesis of Cd(II), Cu(II), Mn(II) and Zn(II) complexes are achieved by adding hydrazine hydrate and 3,5-dihydroxy-2-naphthoic acid in the ratio 1:4 to the corresponding metal nitrates. The synthesized complexes are characterized by elemental analysis, IR, UV, TG-DTA and XRD analysis. The nano metal oxides are obtained by decomposing the complexes at 800 °C in the muffle furnace. The nano metal oxides are characterized by IR and XRD studies. The surface morphology and quantative analysis of metal oxides were determined by using SEM analysis. The shape of nano zinc oxide is rock like hexagonal structure while that of nano Mn oxide is rod like structure which was confirmed by transmission electron microscopy analysis.Item Β-SITOSTEROL ISOLATED FROM RICE HULLS AS AN EFFICIENT CORROSION INHIBITOR FOR MILD STEEL IN ACIDIC ENVIRONMENTS(Royal Society of Chemistry, 2017-04-05) Mayakrishnan, Prabakaran; Seung-Hyun, Kim; Asokan, Sasireka; Venkatesan, Hemapriya; Ill-Min, Chungβ-Sitosterol has an inhibiting effect on the corrosion of mild steel. We investigated this effect in a H2SO4 solution using β-sitosterol-3-O-β-D-glucoside (β-sitosterol) isolated from rice hulls. Proton nuclear magnetic resonance, UV-visible spectroscopy, FT-IR spectroscopy, weight loss measurements, electrochemical studies, and atomic absorption spectroscopy were used to examine the inhibition of β-sitosterol on mild steel corrosion in a 1 M H2SO4 solution. The effect of temperature on the corrosion behavior of mild steel was examined in the range of 303–333 ± 1 K. The inhibition efficiency increased with increasing inhibitor concentration and decreased with increasing temperature. Electrochemical studies indicated that isolated β-sitosterol acted as a good corrosion inhibitor. The surface morphologies of the mild steel specimens were analyzed by scanning electron microscopy. The maximum inhibition efficiency of β-sitosterol (500 ppm) was 95%. The surface morphology was identified using scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM-EDS), and atomic force microscopy (AFM).Item EXPERIMENTAL AND THEORETICAL STUDIES ON INHIBITION OF BENZOTHIAZINES AGAINST CORROSION OF MILD STEEL IN ACIDIC MEDIUM(Emerald Publishing Limited, 2017-05-02) Venkatesan, Hemapriya; Mayakrishnan, Prabakaran; Kandasamy, Parameswari; Subramaniyan, Chitra; Seung-Hyun, Kim; Ill-Min, ChungThe aim of this paper was to investigate the corrosion inhibition potential of two synthesized benzothiazines, namely, 3,4-dihydro-2-methoxycarbonylmethyl-3-oxo-2H-1,4-benzothiazine (1) and ethyl 3-oxo-3,4-dihydro-2H-1,4-benzothiazine-2-carboxylate (2) on mild steel corrosion in 1M H2SO4.Item AN INVESTIGATION APPROACH ON THE SEQUESTRATION OF DIVALENT METAL IONS EMPLOYING ANIMAL WASTE(Oriental Journal of Chemistry, 2017-04-23) Gayathri, N S; Muthulakshmi Andal, N; Anuradha, JThe current investigation deals with utilizing Treated Goat Hoof (TGH), a no cost material derived from butcher shop for the removal of Pb(II) and Cd(II) ions from aqueous media. FTIR / SEM analyses are carried out for the functional groups identification and describe the surface morphology of the chosen material respectively. Batch studies are experimented under varied operating factors viz., particle size, dosage, initial concentration, contact time and pH of the medium to assess the sorptive nature of the chosen material. Verification of the experimental data reveal the optimized conditions for the uptake of Pb(II) and Cd(II) by TGH. Langmuir model registered the best linearity amongst the isothermal plots derived for Langmuir, Freundlich and Tempkin models. Experimental results of both the systems: Pb(II) – TGH and Cd(II)- TGH are subjected to Statistical tool analyses using SPSS 20 software for significance and correlation assessment.Item SHALLOW LEARNING MODEL FOR DIAGNOSING NEURO MUSCULAR DISORDER FROM SPLICING VARIANTS(Emerald Publishing Limited, 2017-08-07) Sathyavikasini, Kalimuthu; Vijaya, VijayakumarDiagnosing genetic neuromuscular disorder such as muscular dystrophy is complicated when the imperfection occurs while splicing. This paper aims in predicting the type of muscular dystrophy from the gene sequences by extracting the well-defined descriptors related to splicing mutations. An automatic model is built to classify the disease through pattern recognition techniques coded in python using scikit-learn framework.Item ARCRECTZONE: A LIGHTWEIGHT CURVED RECTANGLE VECTOR BASED SECURE ROUTING FOR MOBILE AD-HOC SENSOR NETWORK(International Journal of Intelligent Engineering and Systems, 2017-07-09) Viji Gripsy, Jebaseelan; Anithalakshmi, SrinivasanLocation aided routing in Mobile-Ad hoc networks are the most significant process because it limits the route search and allows routing with least messages. Due to the dynamic and uncertain infrastructure of Ad-hoc and sensor networks also creates several security issues like route misbehaviors. This paper aims to develop a new lightweight route selection scheme with the security concern. In this scheme, the routing attack targets are identified and avoided by deploying intellectual watchdog and lightweight key verification mechanisms, the scheme also utilizes the curved rectangle zone selection for shrinking route search space. The scheme is extended to adopt the curved rectangle zone routing for both Ad-hoc and Sensor Networks. The core functionality of the proposed work in terms of cost effective and secure route selection is validated by NS-2 tool. The experimental results demonstrated that the proposed approach is cost effective and secure and provides significant performance improvements with least energy consumption.Item PROXIMATE AND MINERAL ANALYSIS OF A FEW EDIBLE FLOWERS USED IN COIMBATORE DISTRICT, TAMIL NADU(Carpathian Journal of Food Science and Technology, 2017-01) Gowthami, N; Poornima, SVegetables are any part of the plant such as root, tuber, bulb, stem, leaf, flower and seed. The local inhabitants of Coimbatore District mainly depend on wild indigenous vegetables around their locality for food. This paper deals about the proximate and mineral analysis of eight edible flowers used by the local people of Coimbatore District. Carbohydrate and crude fibre were maximum in the flowers of Cucurbita maxima (29.37±0.02% per g and 4.63±0.21% per g respectively), protein and moisture content were maximum in Cassia auriculata (22.95±0.01% per g and 91.83±0.54% per g respectively), lipid was maximum in Benincasa hispida (3.57±0.01% per g) and ash content was maximum in Sesbania grandiflora (1.76±0.04% per g). The contents of calcium was high in B. hispida (1.92±0.06 mg/ g), magnesium and potassium was high in C. maxima (0.98±0. mg/g and 0. 39±0.67 mg/g respectively).