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Madurai, India

Gajendran P.,Madura College | Saraswathi R.,Madurai Kamaraj University
Journal of Solid State Electrochemistry

The electrocatalytic properties of poly(o-phenylenediamine) (PoPD)-Pt-Ru nanocomposite electrode for methanol oxidation have been investigated by linear sweep and cyclic voltammetry. The Pt-Ru ion concentration ratio in the electrodeposition bath is varied in the ratios of 1:0.25, 1:0.5, 1:1, 1:2, and 1:4. The morphology and particle size of the nanocomposites are obtained from the scanning electron microscopy data. The onset potential for the oxidation of methanol is found to be effectively reduced by 220 mV for the (PoPD)-Pt-Ru (1:1) nanocomposite compared to PoPD-Pt electrode. Also, the PoPD-Pt-Ru (1:1) composite shows a value of 4.2 for the ratio of forward to reverse peak current which is relatively a high value that can be observed among the conducting polymer-based catalysts used for methanol oxidation. The results are substantiated by the polarization and stability data. © 2013 Springer-Verlag Berlin Heidelberg. Source

Marimuthu G.,Madura College
Information Sciences

A (p,q) graph G with p vertices and q edges is edge magic graceful if there exists a bijection f:V(G)∪E(G)→{1,2,⋯,p+q} such that |f(u)+f(v)-f(uv)|=k, a constant for any edge uv of G. G is said to be super edge magic graceful if f(V(G))={1,2,⋯,p}. In this paper we present some properties of super edge magic graceful graphs. Using these properties, we prove some classes of graphs are super edge magic graceful. Then we exhibit the relationship between super edge magic graceful labeling and other well studied classes of labelings. In particular, we prove that every super edge magic graceful graph with either f(uv)>f(u)+f(v) for all uvεE(G) or f(uv) Source

A mathematical model of amperometric biosensor is analysed. This model is based on catechol-polyphenol oxidase as a prototype electroenzymatic model system. This paper presents an approximate analytical method (He's Homotopy perturbation method) to solve the system of non-linear differential equations for Michaelis-Menten formalism that describe the concentrations of substrates and product within the enzymatic layer. Analytical expressions for substrate concentrations, product concentration and corresponding current response have been derived for all values of parameters using Homotopy perturbation method. These results are compared with simulation results (Scilab program) and are found to be in good agreement. The obtained results are valid for the whole solution domain. © 2011 Elsevier Ltd. All rights reserved. Source

Rasi M.,Madura College | Rajendran L.,Madura College | Subbiah A.,CSIR - Central Electrochemical Research Institute
Sensors and Actuators, B: Chemical

Mathematical modeling pertaining to the catalytic response of a redox enzymatic system is discussed. The model proposed herein describes the relationship between the electrochemical responses and the kinetic characteristics of the enzymatic reaction. The analytical expressions corresponding to the concentration of co-substrate for steady and non-steady state conditions have been obtained using a new approach to homotopy perturbation method (HPM). Analytical expressions of the plateau current are also presented for steady and non-steady state conditions. Upon comparison, we found that the analytical results of this work are in excellent agreement with the existing limiting case results. Further, the sensitivity of the parameter in transient current potential was also analyzed due to its importance in predicting the relationship between the input value of the parameter and the model results. © 2014 Elsevier B.V. All rights reserved. Source

Eswari A.,Madura College | Rajendran L.,Madura College
Journal of Electroanalytical Chemistry

The steady state concentration and current occurring at a microdisk enzyme electrode when a product from an immobilized enzyme reacts with the electrode is derived. A closed form of an analytical expression of concentration for the full range of enzyme activities has been derived. A simple approximate analytical expression of current in terms of all dimensionless parameters for film thickness r1 / r0 and enzyme kinetic χ r0 for all values of Michaelis-Menten constant is also reported. Available limiting case results are compared with our results and are found to be in good agreement. Crown Copyright © 2010. Source

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