SFR College for women

Sivakasi, India

SFR College for women

Sivakasi, India
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Selvalakshmi S.,Sfr College For Women | Vijaya N.,Sfr College For Women | Selvasekarapandian S.,Materials Research Center | Premalatha M.,Materials Research Center
Journal of Applied Polymer Science | Year: 2017

A new polymer electrolyte based on the biopolymer Agar-Agar doped with ammonium thiocyanate (NH4SCN) has been prepared and characterized by FTIR analysis, X-ray diffraction measurements, AC impedance spectroscopy, transference number measurements, and DSC analysis. The Fourier transform infrared analysis confirms the complex formation between agar and NH4SCN. The amorphous nature of the polymer electrolyte has been revealed from X-ray diffraction analysis. The highest ionic conductivity has been observed for the sample of composition 1:1 between Agar and NH4SCN. As a function of temperature, the ionic conductivity of this sample exhibits Arrhenius behavior increasing from 1.03 × 10−3 S cm−1 at ambient temperature to 3.16 × 10−3 S cm−1 at 343 K. The transference number has been estimated by the dc polarization method, and it has been proven that the conducting species are predominantly cations. Using the highest conductivity polymer electrolyte, solid state electrochemical cell has been fabricated and cell parameters are reported. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44702. © 2017 Wiley Periodicals, Inc.

Kavitha Rani P.R.,SFR College for Women | Fernandez A.,College of Engineering, Trivandrum | Laila S.P.,Kerala University | Arunkumar B.,College of Engineering, Trivandrum | Vishnu V.S.,College of Engineering, Trivandrum
Photodiagnosis and Photodynamic Therapy | Year: 2017

A phenaxazone compound [5H-Benzo[a]phenoxazin-5-one (BP)] along with an aminoquinone[2-[(o-hydroxyphenyl)amino]-1,4-naphthaquinone (HAN)] derivatives were synthesized from lawsone using ultrasound irradiation technique. The structure of the compounds were characterized by elemental analysis and various spectral studies. Optoelectronic properties were studied using Schrodinger material science suit (2015). The compounds exhibit fluorescence emission in longer wave length it may find applications in photodynamic therapy. Single crystal X-ray diffraction studies reveals that the compound BP crystallizes in monoclinic space group. The antioxidant activity of HAN and BP were determined using DPPH radical scavenging assay and the results indicate that both the compounds have good antioxidant capacity, HAN having more scavenging activity than BP. Lead molecules were identified using in silico molecular docking studies as a green chemistry approach. iGEMDOCK, GOLD and Schrödinger softwares were used for these studies. The docking studies reveal that the structural modification of the parent compound gave more active compounds making them promising lead molecules. The lead molecules were subjected to in vitro studies. The cytotoxicity of BP and HAN was studied using human breast cancer (SKBR3) cell lines. The IC50 value of HAN was found to be 19.8 μM while BP was found to have cell viability, less than 10% even at 25 μM concentration. The chemotherapeutic agents kill the cancer cells mainly through apoptosis. HAN and BP were subjected to apoptosis studies. BP was found to more active than HAN. Thus it can be suggested that the mechanism of cell death may be through apoptosis. © 2017 Elsevier B.V.

Anbarasan R.,National Taiwan University | Dhanalakshmi V.,KCET | Rajasulochana K.,SFR College for Women | Jayalakshmi T.,SFR College for Women | Anusuya M.,SFR College for Women
Journal of Applied Polymer Science | Year: 2010

Calcium diacrylate (CDA) and calcium dimethacrylate (CDM) divinyl monomers were synthesized by a solvo thermal method. The FTIR spectra showed a peak at 1650 cm-1 due to the presence of a C=C for both CDA and CDM. Proton NMR and carbon NMR confirmed the structure of CDA and CDM synthesized by a solvo thermal method. DSC determined the melting temperatures of CDA and CDM. XRD indicated the presence of a d110 plane peak for CDA and CDM. The % weight residue that remained above 700°C in TGA method confirmed the higher thermal stability of CDA. Thus, synthesized CDA and CDM were surface grafted on linear low density poly(ethylene) (LLDPE) at 160°Cunder inert atmosphere by thermolysis method. FTIR confirmed the presence of C=O stretching due to CDA and CDM in LLDPE backbone after thermolysis reaction. 1HNMR confirmed the chemical grafting of CDM onto LLDPE. © 2009 Wiley Periodicals, Inc.

Kathirvalavakumar T.,VHNSN College | Ponmalar E.,SFR College for women
International Journal of Machine Learning and Cybernetics | Year: 2013

The proposed work is hybridizing self organizing map (SOM) and wavelet transform for performing image compression. The novelty in this work is applying discrete wavelet transform (DWT) on the code vector obtained from SOM after vector quantization and storing only the approximation coefficients along with the index values of the SOM. The experimental results of the proposed method show better compression and better peak signal to noise ratio (PSNR) value of the decompressed image. © 2012 Springer-Verlag.

Anbarasan R.,National Taiwan University | Kanchana S.,SFR College for Women | Gayathri S.,SFR College for Women | Jayalakshmi T.,SFR College for Women | Dhanalakshmi V.,KCET
Journal of Applied Polymer Science | Year: 2010

Linear low-density polyethylene (LLDPE) was functionalized with succinimide under different experimental conditions like change in time, temperature, and (% weight of succinimide). The FTIR Spectrum inferred that melt grafting of succinimide onto LLDPE followed the 0.50 order of reaction with respect to (% weight of succinimide). DSC was used to analyze the (melting temperature) T m and (crystallization temperature) Tc values of functionalized LLDPE. Free radical mechanism explained the formation of nitroxide radical during the melt functionalization of N-hydroxy succinimide (NHS) with LLDPE in the presence of dicumyl peroxide. © 2009 Wiley Periodicals, Inc.

Sesammal C.A.,Sfr College For Women | Kavitha Rani P.R.,Sfr College For Women | Sona G.,Sfr College For Women
Asian Journal of Chemistry | Year: 2016

Naphthaquinone moiety is present in various cancer drugs. We have synthesized two derivatives from lawsone using phenylenediamine and 4-amino phenol by ultra sound irradiation technique. The synthesized derivatives 10,12-dihydro-5-10-diazatetraphene-12-one and 2-(4-anilino)-1,4-naphthaquinone were characterized by elemental analysis and various spectral techniques like UV-visible, IR, NMR (1H and 13C) and gas chromatographic mass spectra. The study focus to predict the anticancer activity of the synthesized compounds by in silico molecular docking studies using Schrödinger software suit. The selected protein was protein kinase CK2 (PDB ID: 1M2R). Both the derivatives have better interaction with various amino acids present in active site of the protein than the parent compound lawsone. The new derivative 2-(4-anilino)-1,4-naphthaquinone exhibit lowest glide score of -2.8 kcal/mol. From the result, structural modification of the parent compound proved to be a lead compound for further drug design investigations. © 2016, Chemical Publishing Co. All rights reserved.

Devi Arockia Vanitha C.,Sfr College For Women | Devaraj D.,Tamil University | Venkatesulu M.,Kalasalingam University
Procedia Computer Science | Year: 2014

DNA microarray technology can monitor the expression levels of thousands of genes simultaneously during important biological processes and across collections of related samples. Knowledge gained through microarray data analysis is increasingly important as they are useful for phenotype classification of diseases. This paper presents an effective method for gene classification using Support Vector Machine (SVM). SVM is a supervised learning algorithm capable of solving complex classification problems. Mutual information (MI) between the genes and the class label is used for identifying the informative genes. The selected genes are utilized for training the SVM classifier and the testing ability is evaluated using Leave-one-Out Cross Validation (LOOCV) method. The performance of the proposed approach is evaluated using two cancer microarray datasets. From the simulation study it is observed that the proposed approach reduces the dimension of the input features by identifying the most informative gene subset and improve classification accuracy when compared to other approaches. © 2015 The Authors. Published by Elsevier B.V.

Radha K.P.,Sfr College For Women | Mahalakshmi P.,Sfr College For Women | Chitra S.,Sfr College For Women
Der Pharma Chemica | Year: 2016

In the present work, proton conducting solid polymer electrolyte have been prepared using PMMA and adipic acid (C6H10O4) by Solution Casting Technique. From the Magnitude Bode Plot, it has been observed that the Ohmic resistance dominates the impedance at the highest frequencies and it can be read from the high frequency horizontal plateau region. Argand plots of both pure PMMA and adipic acid added electrolyte are incomplete half semicircle suggesting the Non - Debye nature of the polymer electrolytes. At higher frequencies due to the periodic reversal of the electric field there is no excess ion diffusion in the field direction. The presence of long tail in the modulus plot may be due to the large capacitance associated with the electrodes.

Uma Sangari N.,Sfr College For Women | Chitra Devi S.,Sfr College For Women
Journal of Solid State Chemistry | Year: 2013

A microwave assisted chemical precipitation method has been employed for the synthesis of nano zinc oxide rods by reacting zinc nitrate and potassium hydroxide. The amount of potassium hydroxide was adjusted for three different pHs to achieve ZnO nano rods with varying aspect ratio. The mechanism of growth of nano rods is explained briefly. The average crystallite size of the as synthesized samples was analyzed by means of powder XRD pattern and estimated to vary from 25.6 nm to 43.1 nm. The existence of rods was confirmed using scanning electron microscopy (SEM). The samples were also analyzed using FT-IR. The optical properties of the samples were also studied by means of UV-visible spectra and Room Temperature Photo Luminescence studies. The band gap of the samples was determined from the DRS spectrum. A strong near band emission peaks due to surface defects are observed in the PL spectrum. © 2012 Elsevier Inc. All rights reserved.

Vijaya N.,Sfr College For Women | Selvasekarapandian S.,Kalasalingam University | Hirankumar G.,Kalasalingam University | Karthikeyan S.,Kalasalingam University | And 3 more authors.
Ionics | Year: 2012

The proton-conducting polymer electrolytes based on poly (N-vinylpyrrolidone) (PVP), doped with ammonium chloride (NH 4Cl) in different molar ratios, have been prepared by solution-casting technique using distilled water as solvent. The increase in amorphous nature of the polymer electrolytes has been confirmed by XRD analysis. The FTIR analysis confirms the complex formation of the polymer with the salt. A shift in glass transition temperature (T g) of the PVP/NH 4Cl electrolytes has been observed from the DSC thermograms which indicates the interaction between the polymer and the salt. From the AC impedance spectroscopic analysis, the ionic conductivity of 15 mol% NH 4Cl-doped PVP polymer complex has been found to be maximum of the order of 2. 51 × 10 -5 Scm -1 at room temperature. The dependence of T g and conductivity upon salt concentration has been discussed. The linear variation of the proton conductivity of the polymer electrolytes with increasing temperature suggests the Arrhenius type thermally activated process. The activation energy calculated from the Arrhenius plot for all compositions of PVP doped with NH 4Cl has been found to vary from 0. 49 to 0. 92 eV. The dielectric loss curves for the sample 85 mol% PVP:15 mol% NH 4Cl reveal the low-frequency β relaxation peak pronounced at high temperature, and it may be caused by side group dipoles. The relaxation parameters of the electrolytes have been obtained by the study of Tanδ as a function of frequency. © 2011 Springer-Verlag.

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