Muthurangam Government Arts College Autonomous

Vellore, India

Muthurangam Government Arts College Autonomous

Vellore, India
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Franklin D.S.,Manonmaniam Sundaranar University | Guhanathan S.,Muthurangam Government Arts College Autonomous
Iranian Polymer Journal (English Edition) | Year: 2014

Hydrogels are three-dimensional polymeric networks with segments of hydrophilic groups. Stimuli-responsive hydrogels have played attractive role toward much research due to slight modification of environment by abrupt changes in swelling behavior. In this study, a series of pH-sensitive biocomposite hydrogels were acquired through solvent-free green approach by utilization of diethylene glycol (DEG), citric acid (CA), acrylic acid (AA) and hydroxyapatite (HA). Incorporation of hydroxyapatite (HA) prepared from waste eggshells with ACD resulted in the biocomposite hydrogel (ACD–HA). The synthesized biocomposite hydrogel was examined by various characterization techniques, viz., spectral (FTIR), powder X-ray diffraction (XRD) technique, thermal (TGA and DTG), morphological (SEM) and swelling equilibrium studies. In addition, HA was surface treated with two different silane-based coupling agents, namely 3-aminopropyltrimethoxysilane (AMS) and vinyltriethoxysilane (VES) on the performance properties of biocomposite hydrogels. The results of the studies revealed that VES-treated ACD–HA had superior properties than AMS-treated ACD–HA and untreated ACD–HA on overall properties of biocomposite hydrogels. Hence, the decreasing order of swelling equilibrium behavior in various pH, viz., 4.0, 6.0, 7.4, 8.0, 10.0, has been listed as ACD–HA–VES > ACD–HA–AMS > ACD–HA > ACD. The observations indicated that hydrogels’ adaptability with pH-tuned properties may have greater potential in eco-friendly approaches such as metal ion removal, dye removal and agrochemical release. © 2014, Iran Polymer and Petrochemical Institute.

Geetha K.,Muthurangam Government Arts College Autonomous
Journal of Applied Pharmaceutical Science | Year: 2013

The present investigation reports, the novel synthesis of Copper and Copper oxide nanoparticles using Chemical reduction method and its physicochemical characterization. The nanoparticles have been prepared using Copper (II) succinate as precursor. Copper nanoparticles are initially formed and subsequently oxidized to copper oxide. As reported the nanoparticles were characterized by UV-visible spectroscopy, Fourier transform infra-red spectroscopy (FTIR), X-ray diffraction measurements (XRD) and scanning electron microscopy (SEM). SEM analysis exhibited nanoparticles with an average diameter of about 45nm. XRD analysis revealed broad pattern of fcc crystal structure of copper metal and cubic cuprites structure for Cu2O. The antimicrobial properties of copper nanoparticles were investigated using Streptococcus pyogenes, Pseudomonas aeruginosa, Escherichia coli, and Staphylococcus aureus. The bactericidal effects of copper nanoparticles were studied based on diameter of inhibition zone in disk diffusion tests of nanoparticles dispersed in batch cultures. The copper nanoparticles showed excellent activity against Escherichia coli and Staphylococcus aureus, with excellent inhibition zones of 14 mm and 10 mm, respectively. Bacterial sensitivity to nanoparticles was found to vary depending on the microbial species. © 2013 Arunachalam Dinesh Karthik and Kannappan Geetha.

Franklin D.S.,Manonmaniam Sundaranar University | Guhanathan S.,Muthurangam Government Arts College Autonomous
Journal of Applied Polymer Science | Year: 2015

Utilization of hydrogels in a simple, low-cost, solventless. and greener approach toward the pH-responsive hydrogels which comprise of citric acid (CA) with varying glycol unit viz., ethylene glycol (EG), diethylene glycol (DEG), and triethylene glycol (TEG) were prepared along with methacrylic acid (MAA). The formations of pre-polymer and hydrogels were confirmed using 13C-NMR and FT-IR spectral techniques. Thermal studies (TGA, DTA, and DSC) and morphology (SEM) of various hydrogels have been investigated. Swelling studies of hydrogels at different pH ranging from 4.0 to 10.0 have also been performed. The results of swelling studies imply that the percentage of swelling is comparatively higher at neutral pH than acidic and alkaline pH. The reciprocal relationship was identified among thermal stability and swelling behavior of hydrogels while increasing the chain length from EG to TEG. © 2015 Wiley Periodicals, Inc.

Sivakumar M.,SRM University | Sivakumar M.,Ln Government College Ponneri | Kanagesan S.,University Putra Malaysia | Umapathy V.,Caplin Point Laboratories Ltd T.Nagar | And 2 more authors.
Journal of Superconductivity and Novel Magnetism | Year: 2013

CoFe2O4 particles were synthesized using metallic nitrates and polyvinylpyrolidone (PVP) using sol-gel method followed by calcination for 2 h at 960 C. PVP performed as a surfactant and the effect of various concentrations of PVP on the resultant CoFe2O4 powder was studied. The resultant samples were characterized by XRD, TG/DSC, HR-SEM and VSM. X-ray diffraction results indicated the crystalline phase of CoFe2O4 particles and impurity phase of hematite was observed for higher PVP concentrations. SEM images demonstrated the influence of PVP concentration on the size of the particles. By VSM measurements, the variations in magnetic properties with respect to PVP concentration are studied. All the magnetic characteristics H c, M s and M r increased for 6 wt% and 15 wt% of PVP concentration. The CoFe 2O4 particles synthesized with the optimum concentration of PVP may be very attractive for potential applications because of their outstanding magnetic properties (M s =81.1 Am2/kg, H c =831 Gauss). © 2012 Springer Science+Business Media New York.

Sivakumar M.,SRM University | Sivakumar M.,Muthurangam Government Arts College Autonomous | Kanagesan S.,SRM University | Babu R.S.,SRM University | And 5 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2012

CoFe 2O 4 ferrites were synthesized by sol-gel method, having metal nitrates as precursors and PVA as surfactant, followed by a heat treatment at 960 °C for 2 h. The ultrafine ferrite powders obtained have been characterized by X-ray diffraction, thermal gravimetry, differential scanning calorimetry and room temperature magnetic measurement studies. The morphology of the powder was identified by high resolution-scanning electron microscopy. X-ray diffraction results indicate that the resultant CoFe 2O 4 crystallites consist of spinel phase. Significant differences in magnetic properties of CoFe 2O 4 samples synthesized with various concentrations of PVA were observed. The magnetisation measurements show that when the PVA concentration increased, coercivity initially decreased and then increased where as retentivity and magnetization decreased. The optimum concentration of PVA for thesynthesis of CoFe 2O 4 ferrites is obtained from this investigation. Obviously this material can be used as an efficient candidate for practical recording purpose. © 2011 Springer Science+Business Media, LLC.

Karpagam S.,Vellore Institute of Technology | Guhanathan S.,Muthurangam Government Arts College Autonomous | Sakthivel P.,Vellore Institute of Technology
Polymer Bulletin | Year: 2012

Partially conjugated monobenzo 18-crown-6 substituted oligo (p-phenylenevinylene) (MB-OPV) was synthesized via Wittig route. Formation of the oligomer was characterized by spectral (FTIR, 1H NMR, and 13C NMR), elemental and gel permeation chromatography analysis. The morphology of the oligomer film of one-dimensional (1D) and three-dimensional (3D) architectures were observed using atomic force microscopy. The oligomer showed excellent photoluminescence (PL) of bluish green emission at shorter wavelength of 542 nm. Stability of the polymer and glass transition temperature was determined by TGA/DSC. The dielectric properties such as dielectric constant and loss factor for the oligomer have also been studied with respect to change of frequency (50 Hz-5 MHz) and temperature (30-90 °C). The value of dielectric constant decreased with increasing frequency which indicates that the major contribution comes from orientation polarization. The value of dielectric constant increased with increasing temperature which is due to greater freedom of movement of the dipole molecular chains within the oligomer at high temperature. © Springer-Verlag 2011.

Guhanathan S.,Muthurangam Government Arts College Autonomous
Asian Journal of Chemistry | Year: 2011

Three copolyesters were synthesized using 2,3-butane diol with phthaloyl chloride. 2,5-Ditertiary butyl quinol, 1,2-propane diol and 1,5-naphthalene diol were used as another diols for the synthesis of random copolymer. Thermal studies were carried out using DSC and TGA. Results of the investigation confirm relatively new entry copolymers in the family of thermally stable copolymers.

Jayaseelan D.,Muthurangam Government Arts College Autonomous | Guhanathan S.,Muthurangam Government Arts College Autonomous
Ecotoxicology and Environmental Safety | Year: 2015

A conventional and microwave assisted efficient synthesis of diphenyl substituted pyrazole using PEG 600 as green solvent has been described. A relatively shorter reaction time with excellent yield of the piperidine mediated protocol has been attracted economically attractive and eco-friendly. All newly synthesized compounds were characterized by standard spectroscopic techniques viz., UV-visible, FT-IR, 1H-NMR and Mass spectra. The anti-microbial activities of compounds have also been tested using Minimum Inhibitory Concentration (MIC) method with two different microorganisms Staphylococcus aureus (MTCC3381) and Escherichia coli (MTCC739). The results of the antimicrobial activity revealed that the diphenyl substituted pyrazole derivatives have nice inhibiting nature against both types of bacteria of present investigation than corresponding chalcones. Since, the work has been focused on green chemical approach towards the synthesis, this protocol may be recommended for eco-friendly applications. © 2015 Elsevier Inc.

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