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Uma Sangari N.,The Sfr College For Women | Velusamy P.,Ayya Nadar Janaki Ammal College
International Journal of ChemTech Research | Year: 2014

Enhancement of photodecoloration of Metanil yellow by ZnO in presence of Beta cyclodextrin (β-CD) was investigated under UV light. The factors influencing the photodecoloration of Metanil yellow such as the initial concentration of the dye, pH of dye solution, amount of catalyst and illumination time were studied. It was observed that the rate of photodecoloration of MY in aqueous solution was enhanced in presence of β-CD. The inclusion of MY in to hydrophobic cavity of β-CD was investigated through UV-Visible spectroscopy. The interaction of β-CD with the surface of ZnO was analyzed by XRD, UV-DRS, FT-IR and PL spectra. The kinetics of photodecoloration by ZnO and ZnO -β-CD was tested with Langmuir-Hinshelwood mechanism. © 2014, Sphinx Knowledge House. All rights Reserved.

Premalatha M.,The Sfr College For Women | Premalatha M.,Materials Research Center | Vijaya N.,The Sfr College For Women | Selvasekarapandian S.,Materials Research Center | And 2 more authors.
Ionics | Year: 2016

Thin films of blend polymer electrolytes comprising poly(vinyl alcohol) (PVA) and poly(vinyl pyrrolidone) (PVP) complexed with ammonium thiocyanate (NH4SCN) salt in different compositions have been prepared by solution casting technique using distilled water as solvent. The prepared films have been investigated by different experimental techniques. The complexation of these films has been studied by FTIR spectroscopy. The increase in amorphousness of the films with increase in NH4SCN content has been confirmed by XRD analysis. The addition of ammonium thiocyanate salt to PVA-PVP polymer blend shows a shift in Tg of the blend. The effect of salt concentration and temperature on the ionic conductivity of the polymer blend films has been analyzed using AC impedance spectroscopy. The maximum conductivity of 6.85 × 10−4 S cm−1 at room temperature has been observed for the blend with 50 mol% PVA-50 mol% PVP complexed with 40 mol% NH4SCN. The activation energy has been found to be minimum (0.24 eV) for this sample. Wagner’s polarization technique shows that the charge transport in these blend films is predominantly due to ions. Using the highest conductivity blend polymer electrolyte, a proton battery has been fabricated and its discharge characteristics have been studied. © 2016 Springer-Verlag Berlin Heidelberg

Sivadevi S.,Bharathiar University | Sivadevi S.,The Sfr College For Women | Sivadevi S.,Materials Research Center | Selvasekarapandian S.,Materials Research Center | And 5 more authors.
Ionics | Year: 2015

Blending of polymers is one of the most useful methods for modulating the conductivity of solid polymer electrolytes. Blend polymer electrolytes have been prepared with polyvinyl alcohol (PVA)-polyacrylonitrile (PAN) blend doped with ammonium thiocyanate with different concentrations by solution casting technique, using dimethyl formamide (DMF) as the solvent. The prepared electrolytes are characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), nuclear magnetic resonance (NMR), ultraviolet (UV), and ac impedance measurement techniques. The increase in amorphous nature of the blend polymer electrolyte by the addition of salt is confirmed by XRD analysis. The complex formation between the polymers and the salt has been confirmed by FTIR analysis. The thermal behavior has been examined using DSC and TGA. The maximum conductivity has been found to be 2.4 × 10−3 S cm−1 for 92.5PVA/7.5PAN/25 % NH4SCN sample at room temperature. The temperature dependence of conductivity has been studied with the help of Arrhenius plot, and the activation energies are calculated. The proton conductivity is confirmed by dc polarization measurement technique. 1H NMR studies reveal the presence of protons in the sample. A proton battery is constructed with the highest conducting sample, and its open circuit voltage is measured to be 1.2 V © 2014, Springer-Verlag Berlin Heidelberg.

Devi Arockia Vanitha C.,The Sfr College For Women | Devaraj D.,Kalasalingam University | Venkatesulu M.,Kalasalingam University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

Clustering has been used as a popular technique for identifying a natural grouping or meaningful partition of a given data set by using a distance or similarity function. This paper proposes a novel real coded Genetic algorithm (GA) for the development of optimal Gustafson Kessel (GK) clustering algorithm. In this work, the objective function of the GK algorithm is optimized using real coded genetic algorithm. The cluster centers are represented as real numbers and real-parameter genetic operators are applied to obtain the optimal cluster centers that minimize the intra-cluster distance. The performance of the proposed approach is demonstrated through three gene expression data sets. Xie-Beni index is used to arrive at the best possible number of clusters. The proposed method has produced the objective function value which is less than the value obtained using K-Means, Fuzzy C-Means and GK algorithms. Statistical analysis of the test results shows the superiority of the proposed algorithm over the existing methods. © Springer International Publishing Switzerland 2015.

Genova F.K.M.,Bharathiar University | Genova F.K.M.,The Sfr College For Women | Genova F.K.M.,Materials Research Center | Selvasekarapandian S.,Materials Research Center | And 4 more authors.
Polymer Science - Series A | Year: 2015

Blend polymer electrolyte membranes that consist of poly(vinyl alcohol) (PVA), poly (acrylonitrile) (PAN) and different concentrations of lithium bromide (LiBr) have been prepared by solution casting technique using dimethylformamide (DMF) as solvent. The amorphous nature of the blend polymer (92.5 PVA: 7.5 PAN)—salt complexes has been confirmed by X-ray diffraction analysis. The formation of blend polymer (92.5 PVA: 7.5 PAN)—salt complexes has been confirmed by Fourier transform infrared spectral studies. The decrease in glass transition temperature (Tg) with the salt reveals the increase in segmental motion. Conductivity studies have been carried out using ac impedance spectroscopy and it has been found that, the maximum ionic conductivity is 3.0 × 10–4 S cm–1 for 30 wt % LiBr doped—92.5 PVA: 7.5 PAN electrolyte. The temperature dependence of conductivity of the blend polymer electrolyte has been discussed. The activation energy is calculated for all compositions of blend polymer doped with LiBr using Arrehenius plot. The dielectric spectra show low frequency dispersion. Ionic transference number (t+) has been found to be 0.98 for the blend polymer (92.5 PVA: 7.5 PAN) with 30 wt % LiBr. This result reveals that the conducting species are predominantly ions. Primary battery has been constructed with the configuration Zn + ZnSO4 · 7H2O/92.5 PVA: 7.5 PAN: 30 wt % LiBr/PbO2 + V2O5 using the maximum conducting blend polymer, and its discharge characteristics has been discussed. © 2015, Pleiades Publishing, Ltd.

Vijaya N.,The Sfr College For Women | Selvasekarapandian S.,Materials Research Center | Sornalatha M.,Materials Research Center | Sujithra K.S.,Materials Research Center | Monisha S.,Materials Research Center
Ionics | Year: 2016

Research has been undertaken to develop polymer electrolytes based on biodegradable natural polymers such as cellulose acetate, starch, gelatin, and chitosan, which are being used as polymer hosts for obtaining new polymer electrolytes for their applications in various electrochemical devices such as batteries, sensors, and electrochromic windows. Pectin is a naturally available material which is extracted from the skin of citrus fruits. Pectins, also known as pectic polysaccharides, are rich in galacturonic acid. The present study focuses on the proton-conducting polymer electrolytes based on the biopolymer pectin doped with ammonium chloride (NH4Cl) and ammonium bromide (NH4Br) prepared by solution casting technique. The prepared membranes are characterized using XRD, FTIR, and AC impedance techniques to study their complexation behavior, amorphous nature, and electrical properties. The conductivity of pure pectin membrane has been found to be 9.41 × 10−7 S cm−1. The polymer systems with 30 mol% NH4Cl-doped pectin and 40 mol% NH4Br-doped pectin have been found to have maximum ionic conductivity of 4.52 × 10−4 and 1.07 × 10−3 S cm−1, respectively. The conductivity value has increased by three orders of magnitude compared to pure pectin membrane. The dielectric behavior of both the systems has been explained using dielectric permittivity and electric modulus spectra. © 2016 Springer-Verlag Berlin Heidelberg

Sangari N.U.,The Sfr College For Women
International Journal of ChemTech Research | Year: 2015

Nano Zinc Oxide (ZnO) nano particles were synthesized through a simple and cost effective chemical precipitation method. The synthesized samples were characterized by XRD and SEM. The influence of the double heating on the particle size was investigated. It was observed that the particle size of samples increased upon microwave heating. The product formation was confirmed from FT-IR spectra. © 2014, Sphinx Knowledge House. All rights reserved.

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