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M.V. Sangaranarayanan
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M.V. Sangaranarayanan
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M.V. Sangaranarayanan
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M.V., Sangaranarayanan
Sangaranarayanan, M. V.
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40 results
Now showing 1 - 10 of 40
- PublicationExact enumeration of conformations for two and three dimensional lattice proteins(01-01-2016)
;Silpaja Chandrasekar, K.We report an efficient methodology for exactly enumerating conformations of lattice proteins, taking into account the self-avoiding nature. These self-avoiding walks in square and simple cubic lattices take into account, the detailed paths by which a destination site can be reached from a starting site. The strategy employing Java programming enables the exact enumeration for very large lattice sizes. The estimation of these conformations is helpful in designing the protein sequences pertaining to Hydrophobic-Polar models. - PublicationA sensitive electrochemical detection of progesterone using tin-nanorods modified glassy carbon electrodes: Voltammetric and computational studies(01-03-2018)
;Das, AshisIn recent years, there has been significant interest in the design of electrodes for enhanced electrochemical sensing platforms towards selective and sensitive detection of biological steroid hormones. We report here a facile, template-free electrodeposition of tin nanorods on glassy carbon electrodes and analyse its efficacy for the sensing of progesterone using voltammetric and amperometric techniques. The physicochemical properties of the tin-nanorods modified glassy carbon electrodes are characterized by electron microscopic studies, UV–vis spectral analysis, X-ray diffraction and electrochemical impedance spectroscopy. The mechanism involved in the reduction of progesterone has been elucidated using quantum chemical calculations and the influence of the cationic surfactant (cetyltrimethylammonium bromide) is pointed out. The estimation of progesterone is carried out with differential pulse voltammetry and amperometry. The electrode exhibits an impressive response towards the sensing of progesterone in terms of higher sensitivity, linear calibration regime varying from 40 to 600 μM with the lowest detection limit being 0.12 μM. The effect of other interfering agents such as testosterone, 17β-estradiol, creatinine, uric acid and ascorbic acid is also analysed using differential pulse voltammetry. The analysis of progesterone assay in commercial pharmaceutical formulations has also been carried out and reveals a satisfactory agreement. - PublicationInfluence of pulse and direct current on electrodeposition of Ni–Gd 2 O 3 nanocomposite for micro hardness, wear resistance and corrosion resistance applications(01-06-2019)
;Sivasakthi, P.In this study, Ni and Ni–Gd 2 O 3 nanocomposite are electrodeposited from nickel sulphamate electrolyte using pulse current (PC) and direct current (DC). The surface morphology, chemical composition, surface topography, preferred orientation, micro hardness and wear resistance of Ni and Ni–Gd 2 O 3 nanocomposite were characterized by SEM, EDAX, AFM, XRD, Vickers hardness tester and Taber Rotary Platform Abrasion Tester. The potentiodynamic polarization and electrochemical impedance spectroscopy were studied in 3.5 wt % NaCl solution. These results indicated that the pulse current method of Ni–Gd 2 O 3 nanocomposite offers uniform surface, higher micro hardness, wear resistance and corrosion resistance than the direct current method of Ni–Gd 2 O 3 nanocomposite. - PublicationReduction of mono-and dichlorobiphenyls with sodium-naphthalene complex(01-04-2010)
;Boyarskii, V. P.; ;Khaibulova, T. ShBoyarskaya, I. A.Reactivity of low-chlorinated congeners of polychlorinated biphenyls in relation to sodiumnaphthalene complex in THF was studied. It was shown that the rate of reduction of these substrates weakly depended on their structure. The regioselectivity of the first stage of reduction of dichlorobiphenyls may be caused by relative stability of the intermediately formed aryl radicals. Kinetic analysis of the processes taking place in the system showed that sodium-naphthalene complex alongside with one-electron reduction of dichlorobiphenyls is involved also in the multi-electron reduction leading directly to biphenyl avoiding the stage of formation of monochlorobiphenyl. © Pleiades Publishing, Ltd., 2010. - PublicationElectrochemical Sensing of Nitrite Ions Using Tin-Submicroparticles Modified Glassy Carbon Electrodes(01-11-2014)
;Sivasubramanian, R.The applicability of tin submicroparticles modified glassy carbon electrodes for sensing of nitrite ions is demonstrated. Tin submicroparticles have been electrodeposited on a glassy carbon electrode using constant potential deposition. The detection of nitrite ions is carried out with differential pulse voltammetry, amperometry and electrochemical impedance spectroscopy. The lowest detection limit of 0.5μM with a linear range of 5μM-1000μM is inferred from the differential pulse voltammetry. The interference from different compounds such as urea, glucose and nitrate ions is also analyzed. - PublicationAnalysis of C-F bond cleavages in methylfluorobenzoates-Fragmentation and dimerization of anion radicals using convolution potential sweep voltammetry(01-02-2010)
;Muthukrishnan, A.The electrochemical reduction of methylfluorobenzoates at glassy carbon electrodes is analyzed using the convolution potential sweep voltammetry (CPSV). The stabilization of the radical anion due to the electron-withdrawing group is shown to lead to intra-molecular stepwise dissociative electron transfer. While methyl 2-fluorobenzoate (ortho isomer) follows EC mechanism, the methyl 4-fluorobenzoate (para-isomer) undergoes electro-dimerization prior to C-F bond cleavage. The first order rate constant for the EC mechanism and the dimerization rate constant for the electro-dimerization are deduced from the classical as well as convolution potential sweep voltammetry. A plausible mechanism of dimerization is suggested. The influence of the electron-withdrawing groups is illustrated by comparing the reduction behaviour of 4-fluorobenzonitrile. The potential energy surfaces and electron density mapping employing Gaussian 03 calculations provide further support for the validation of the mechanism pertaining to C-F bond cleavages. © 2009 Elsevier Ltd. All rights reserved. - PublicationDetection of lead ions in picomolar concentration range using underpotential deposition on silver nanoparticles-deposited glassy carbon electrodes(30-09-2011)
;Sivasubramanian, R.The efficacy of silver-deposited glassy carbon electrode for the determination of lead ions at the sub-nanomolar concentration ranges is investigated. The silver nanoparticles are electrodeposited on glassy carbon electrode using chronoamperometry and the electrode surface is characterized using SEM. Lead ions are detected in the region of underpotential deposition. The analysis is performed in square wave mode in the stripping voltammetry without the removal of oxygen. The detection limit of 10 pM has been obtained with a constant potential of -0.7 V during the electrodeposition step for a period of 50 s. The interference of surfactants in the detection of lead ions is also studied. © 2011 Elsevier B.V. All rights reserved. - PublicationShape-controlled synthesis of three-dimensional triangular bismuth microstructures and sensing of H2O2(21-02-2016)
;Das, AshisThe electrodeposition of triangular microstructures of Bi on indium tin oxide surfaces is carried out by optimizing the potentials, precursor concentrations and deposition times. The potential-controlled hierarchical evolution of Bi geometries from triangles to dendrites is demonstrated and the structures have been characterized using SEM, TEM, AFM, XRD, UV-visible absorption and FT-Raman spectroscopy. The Scharifker-Hills model is employed to elucidate the nucleation-growth mechanism of triangular Bi particles. The efficacy of triangular bismuth structures towards the oxidation of H2O2 is analyzed using cyclic voltammetry and electrochemical impedance spectroscopy. By using differential pulse voltammetry and chronoamperometry, indium tin oxide coated with Bi triangles is shown to be a satisfactory sensor for H2O2. - PublicationEnzyme-catalyzed oxygen reduction reaction in biofuel cells: Analytical expressions for chronoamperometric current densities(01-07-2015)
;Rasi, M. ;Rajendran, L.The transient current-potential response of the enzyme-catalyzed oxygen reduction reaction in biofuel cells is analyzed. The onedimensional nonlinear reaction-diffusion equation is solved analytically using the homotopy method for deriving the substrate concentrations and current densities pertaining to chronoamperometric response. The time required to obtain the steady state has been obtained and the influence of film thickness, diffusion coefficients, and enzyme characteristics has been deciphered. The equations are shown to be valid for experimental data on mediated electron transfer reactions of redox polymers containing osmium complexes. The substrate concentrations and current densities for supported, gas-diffusion and flow through electrodes are also reported. - PublicationA facile synthetic strategy for mesoporous crystalline copper-polyaniline composite(01-03-2012)
;Divya, V.A facile and novel strategy for preparing mesoporous crystalline copper-polyaniline composite is reported wherein the reaction is carried out at room temperature using copper nitrate as the oxidizing agent and methanol as the solvent. The composite obtained as a precipitate has been characterized using UV-visible absorption spectroscopy (UV-vis), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption-desorption method, Barrett-Joyner-Halenda (BJH) method, Brunauer-Emmett-Teller method (BET) and thermogravimetric analysis (TGA). The XRD studies in conjunction with the BJH method reveals that the composite has crystalline nature with a mesoporous structure and has a diameter of 3.5 nm. The specific surface area of copper-polyaniline composite is estimated to be as high as 63.2 m 2 g -1 using the BET surface area plot. The characterization of the filtrate indicates the presence of pernigraniline with a very small weight percent of copper. © 2011 Elsevier Ltd. All rights reserved.