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Ramanathapuram, India

Rajendran S.,Alagappa University | Bama V.S.,Sethupathy Government Arts College
Journal of Non-Crystalline Solids | Year: 2010

Plasticized polymer electrolyte films containing poly (vinyl acetate) (PVAc)/poly(methyl methacrylate) (PMMA)-LiClO 4 with different plasticizers are prepared by solvent casting technique. Complexation of the prepared electrolytes is confirmed by X-ray diffraction analysis and Fourier Transform Infra red analysis. Ionic conductivities of the electrolytes are determined by AC impedance studies in the temperature range of 303-343 K. The temperature dependent ionic conductivity plot seems to obey Vogel-Tamman-Fulcher relation. The ionic transport in the polymer electrolytes has been discussed on the basis of free volume theory. Thermal stability and the surface morphology of the polymer electrolytes are examined by using thermogravimetric/differential thermal analysis and scanning electron microscope respectively. The highest ionic conductivity 5.064 × 10 -4 Scm -1 have been observed for ethylene carbonate based complex because of the higher dielectric constant (89.6 at 40 °C) among the other plasticizers. © 2010 Elsevier B.V. All rights reserved. Source


Balamurali S.,Manonmaniam Sundaranar University | Balamurali S.,Sree Sevugan Annamalai College | Chandramohan R.,Sree Sevugan Annamalai College | Suriyamurthy N.,Radiological Safety Division Center | And 4 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2013

Polycrystalline Mn doped ZnO (MZO) semiconductor thin films were deposited onto glass substrates employing different number of dipping at room temperature using Successive Ionic Layers by Adsorption Reaction (SILAR) technique. The thin film deposition conditions were optimized by altering the various deposition parameters based on their structure. The structural study was carried out using X-ray diffractometer (XRD). The XRD analysis indicated that there is no change in the structure of ZnO thin films due to Mn doping. The films exhibited hexagonal wurtzite structure. The structural studies on Mn doped samples revealed that the predominant orientation is (002) lattice plane and the position of this orientation shifted toward lower angle during doping. The intensity of photoluminescence (PL) emission of ZnO is found to be augmented for Mn doped samples. The room temperature Raman spectra measurements revealed the presence of additional modes. The Vibrating Sample Magnetometer (VSM) studies show that MZO thin film has ferromagnetic properties. © 2012 Springer Science+Business Media New York. Source


Balamurali S.,Manonmaniam Sundaranar University | Balamurali S.,Sree Sevugan Annamalai College | Chandramohan R.,Sree Sevugan Annamalai College | Karunakaran M.,Sree Sevugan Annamalai College | And 5 more authors.
Microscopy Research and Technique | Year: 2013

Transparent conducting Mn-doped ZnO thin films have been prepared by successive ionic layer by adsorption reaction (SILAR) method. The deposition conditions have been optimized based on their structure and on the formation of smoothness, adherence, and stoichiometry. The results of the studies by X-ray diffraction, scanning electron microscope (SEM), reveal the varieties of structural and morphological modifications feasible with SILAR method. The X-ray diffraction patterns confirm that the ZnO:Mn has wurtzite structure. The interesting morphological variations with dopant concentration are observed and discussed. The films' quality is comparable with those grown with physical methods and is suitable for spintronic applications. © 2013 Wiley Periodicals, Inc. Source


Ananthakumar K.,Sethupathy Government Arts College | Krishnammal A.,Madurai Kamaraj University
Indian Journal of Environmental Protection | Year: 2011

The present study deals with the removal of brilliant green (BG) on commercial activated charcoal (CAC). The effect of initial concentration of dye, contact time, dose of adsorbent, temperature and surfactant on the removal of brilliant green by adsorption on CAC has been studied. The percentage removal of dye on adsorbent was found to increase with increase in initial concentration of dye. The percentage removal of dye was found to increase and reaches a maximum value with increase in contact time. The percentage removal of dye by adsorption exponentially increases with increase in dose of adsorbent. This was due to the availability of active sites. The percentage removal of dye was found to decreases with increase in temperature. From this data the thermodynamic parameters, such as ΔH°, ΔG° and ΔS° were calculated. The percentage removal of dye was found to decrease with increase in surfactant. Langmuir and Freundlich models were tested. The system covered monolayer adsorption. © 2011 - Kalpana Corporation. Source


Ananthakumar K.,Sethupathy Government Arts College | Muthuvinayaga Keerthiha S.,P.A. College
Indian Journal of Environmental Protection | Year: 2010

The present work deals with the adsorption of propanoic acid by batch adsorption technique on commercial activated charcoal (CAC). The temperature is maintained at 32.5 ± 0.5 °C and mechanical shaker is operated at 130 ± 5 rpm .The effect of the initial concentration of acid indicated that the percentage adsorption of the propanoic acid is low at higher concentration .The percentage adsorption exponentially decreases with the increase In initial concentration of propanoic acid. The effect of pH showed that the percentage adsorption is low at basic medium. The adsorption of acid on adsorbent is found to be highly pH dependent .The pH of the medium increases the. extent of adsorption decreases. The percentage adsorption increases with increase in the dose rate of the CAC. This may be due to the rapid increase in the surface area and the number of active sites available for accommodating the propanoic acid. The effect of the contact time indicated that the rate of adsorption of propanoic acid is higher at 60 min. It was observed that the percentage adsorption is decreases with increase in temperature. The thermodynamic parameters, such as energy of activation (E a), standard free energy change (ΔG °), standard entropy change (ΔS °\) and standard enthalpy change (ΔH °) for the adsorption of propanoic acid were calculated. The data obtained in the adsorption studies are modelled with classical Freundlich isotherm. ©2010 - Kalpana Corporation. Source

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