Arul Anandar College Autonomous

Madurai, India

Arul Anandar College Autonomous

Madurai, India
SEARCH FILTERS
Time filter
Source Type

Bementa E.,Arul Anandar College Autonomous | Jothi Rajan M.A.,Arul Anandar College Autonomous | Gnanadass E.S.,Arul Anandar College Autonomous
Polymer - Plastics Technology and Engineering | Year: 2017

Three systems of starch-based crust electrolytes were prepared using various gelatinization times, various weight percentages (wt%) of starch, and various wt% of starch incorporated into potassium iodide. All the samples were subjected to electrochemical impedance spectroscopy, X-ray diffraction spectroscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, and transference number measurements. Electrochemical impedance spectroscopy shows that 1.7 wt% of starch has maximized the room temperature conductivity of the electrolyte to 1.4587 × 10−4 S cm−1. The conductivity was enhanced to 4.5278 × 10−4 S cm−1 on the increment of starch’s wt% from 1.7 to 3.2. This conductivity was further enhanced to 3.4609 × 10−3 S cm−1 on the addition of 0.3 wt% of potassium iodide. The conductivity enhancement was found due to the formation of glucosyl carboxonium ions. The effect of longer heating time in gelatinization is attributed to the formation of glucosyl carboxonium ions. X-ray diffraction spectroscopy affirms the reduction in crystallinity of starch. Scanning electron microscopy analysis shows the porous morphology of starch electrolyte, and addition of potassium iodide shows the morphology of bean nuts like particles seated on the pores. Fourier transform infrared confirms the degradation of starch. Transference number measurements of the crust electrolyte shows that ions are the dominant conducting species. All the results are authenticating that the conductivity enhancement in starch-based crust electrolyte is due to starch and the addition of inorganic salts. © 2017 Taylor & Francis


Maria Dhivya S.,Arul Anandar College Autonomous | Sathiya S.M.,Arul Anandar College Autonomous | Manivannan G.,Nmssvellaichamy Nadar College | Jothi Rajan M.A.,Arul Anandar College Autonomous | Jothi Rajan M.A.,Nmssvellaichamy Nadar College
Materials Today: Proceedings | Year: 2016

Compared with bulk materials, nanoparticles have many outstanding properties, like optical, electronic, catalytic, and magnetic properties. Here the magnetite (Fe3O4) nanoparticles and biopolymer functionalized magnetite nanoparticles were synthesized by simple co-precipitation by using an aqueous solution containing ferrous (Fe2+) and ferric (Fe3+) ion salts in an alkaline media with poly (ethylene glycol) (PEG 400) as the surfactant. Both bare and Chitosan-coated iron oxide nanoparticles (IONPs) were subsequently characterized and evaluated for their antibacterial activity against Escherichia coli KL226. The XRD result indicates the formation of Fe3O4 nanoparticles and Chitosan (CS) coated Fe3O4 nanoparticles. Fourier transform infrared spectroscopy (FT-IR) studies confirm the bonding of the Chitosan polymer with Fe3O4 nanoparticles. The magnetic properties of the samples were measured by vibration sample magnetometer that confirmed ferromagnetic behaviour of magnetite nanoparticles at room temperature. The antibacterial test showed inhibition against E. coli with significant antagonistic activity. © 2016 Elsevier Ltd. All rights reserved.


Bementa E.,Arul Anandar College Autonomous | Jothi Rajan M.A.,Arul Anandar College Autonomous
Materials Today: Proceedings | Year: 2016

Ion conducting biopolymer electrolyte crust based on starch and potassium iodide has been primed through Gelation method. In this exertion we report the details of conductivity, dielectric, dielectric loss tangent and modulus study of starch incorporated with potassium iodide. The values of the parameters that are required in the equation are obtained from Nyquist plots and impedance data. The decrease in bulk resistance value obtained from the Nyquist plots indicates the enhancement of conductivity in crust. The frequency dependence dielectric study shows that the value of dielectric constant is high at lower frequencies and decreases with increase in frequency. The tangent loss peaks shift towards the high frequency side on increased KI concentration which reveals that there is an increase in amorphous content in starch incorporated KI crust. The real and imaginary parts of the electrical modulus show the long tail in low frequency side which depict the membrane is an ionic conductor; also the increase in conductivity is due to the mobile ions. © 2016 Elsevier Ltd. All rights reserved.


Sathiya S.M.,Arul Anandar College Autonomous | Okram G.S.,UGC-DAE Consortium for Scientific Research | Maria Dhivya S.,Arul Anandar College Autonomous | Manivannan G.,Nmss Vellaichamy Nadar College | And 3 more authors.
Materials Today: Proceedings | Year: 2016

Zinc Oxide nanoparticles (ZNPs) and CS/Zinc oxide nanocomposites (CS/ZnO NCs) were successfully synthesized by wet chemical method. Formation of ZNPs and the interaction of CS/ZnO NCs were characterized by X-ray diffraction (XRD), Zeta potential, and Transmission Electron Microscopy (TEM) techniques. Thermal stability of the prepared samples was characterized by Thermogravimetric Analysis (TGA). TEM images shows the interaction between the ZNPs and CS polymer and the particles has spherical like structure with average crystallite size of 22 nm and is in good agreement with XRD results. The aim of this study was to investigate the attachment of these nanoparticles with Escherichia coli (E. coli) bacterial outermost cell membrane and their mode of action against these bacterial strains by agar well diffusion method and resazurin dye reduction method. Both the test materials synthesized revealed resistivity against E. coli up to 6 mg/mL. © 2016 Elsevier Ltd. All rights reserved.


Wilson K.S.J.,Arul Anandar College Autonomous | Revathy V.,Arul Anandar College Autonomous | Lenin M.M.,Annai Velankanni College | Jothy V.B.,Womens Christian College
Materials Today: Proceedings | Year: 2015

The transmission properties of one dimensional photonic crystals with two defects having structures (HL)n(D1LD2L)m(HL)n, where m is the stack number of the Photonic Quantum Well (PQW) have been theoretically investigated by the transfer matrix method. The thickness and temperature dependence of the defect modes have been studied by considering Si and air as the high and low refractive index materials with GaAs and InSb as the two defects. For a defect lattice with m=1 (two defects) the two peaks due to defects are shifted towards the higher wavelength region, when the thickness of the defect layers is changed. Also, the transmittance peaks are shifted by 0.44. nm/K and 0.50. nm/K due to temperature variation. The above shifts for other cases (m ≠ 1 and n ≠ 1), have also been obtained. Part of these results is in qualitative agreement with the results available in the literature for other photonic crystals. © 2015 Elsevier Ltd.


Joseph Wilson K.S.,Arul Anandar College Autonomous | Revathy V.,Arul Anandar College Autonomous
Progress In Electromagnetics Research M | Year: 2015

We theoretically investigate the photonic band gaps in one-dimensional photonic crystals based on nano composite of silver nanoparticles. The dielectric permittivity is calculated in accordance with temperature dependence of plasma frequency of silver nanoparticle. The effect of temperature on these structures by incorporating the volume expansion coefficient of nanoparticle is analysed. The behaviors of photonic band gaps with variation of filling factor, radii of nanoparticle and temperature are observed. The evolution of these results leads to designing the desired photonic crystals. © 2015, Electromagnetics Academy. All rights reserved.


Wilson K.S.J.,Arul Anandar College Autonomous
Optics Communications | Year: 2016

We theoretically investigate the effect of photonic band gaps in one dimensional photonic crystals based on nanocomposite of silver nanoparticles. The dielectric permittivity is computed based on the pressure dependence of plasma frequency and damping constant of silver nanoparticle. It leads to the tuning of photonic band gap. We have also investigated the change in photonic band gap due to the influence of filling factor and the size of the nanoparticles. Our results provide a guideline for designing potential photonic devices. © 2016 Elsevier B.V. All rights reserved.


Wilson K.S.J.,Arul Anandar College Autonomous | Revathy V.,Arul Anandar College Autonomous
Indian Journal of Physics | Year: 2015

We analyze theoretically, the effect of temperature dependence on dielectric permittivity of nanocomposite of silver nanoparticle embedded in SiO2. The dielectric permittivity is calculated in accordance with the temperature-dependent plasma frequency of silver nanoparticle. We investigate this effect by changing the radii of spherical nanoparticle and the filling factor by incorporating the temperature-dependent volume expansion coefficient of nanoparticle. The width of the frequency range, in which the real part of the dielectric permittivity becomes negative, is studied. The variation of dielectric permittivity with frequency is also studied. The temperature-dependent plasma frequency is implemented in multilayer structures for tuning their optical properties, which is used for designing optical filters, sensors etc. © 2015, Indian Association for the Cultivation of Science.


Jeice A.R.,Annai Velankanni College | Jayam S.G.,Holy Cross College | Wilson K.S.J.,Arul Anandar College Autonomous
Indian Journal of Physics | Year: 2016

The binding energy and diamagnetic susceptibility of a hydrogenic donor in nanostructures like quantum well, quantum wire and quantum dot have been calculated for the finite and infinite barrier square well potential and are computed using variational technique. The binding energy of cubic nanostructures formed by GaAs/Ga1−xAlxAs has also been obtained using conduction band non-parabolicity and polaronic correction. Our results demonstrate that the effect of polaronic mass and band non-parabolicity which exhibits effective binding energy and diamagnetic susceptibility for the nanostructures having narrow width sizes and it is not significant to the low dimensional nanostructures. © 2016, Indian Association for the Cultivation of Science.


Revathy V.,Arul Anandar College Autonomous | Wilson K.S.J.,Arul Anandar College Autonomous
Asian Journal of Chemistry | Year: 2013

Several optical properties of crystals are modified due to non-linearity associated with high intensity of the incident radiation. In the present work, we explore the possibilities of nonlinear effects in the optical parameters especially in the polariton behaviour of certain optoelectronic materials like LiNbO3 and LiTaO3. A new mode on the polaritonic gap, where the propagation of electromagnetic wave is forbidden, is obtained in these materials as suggested by some recent literature. It is also extend to superlattice system. The effect on nonlinear interactions of phonon polaritons in LiNbO3/LiTaO3 superlattices is discussed. Various modes of polariton dispersion is also analyzed. © Asian Journal of Chemistry 2013.

Loading Arul Anandar College Autonomous collaborators
Loading Arul Anandar College Autonomous collaborators