Hkrh College

Uthamapalayam, India

Hkrh College

Uthamapalayam, India
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Thirumalaisamy T.K.,Hkrh College
Journal of Materials Science: Materials in Electronics | Year: 2011

The precise electronic structure of lead molybdate (PbMoO 4) has been studied using powder X-ray data. The acousto-optical, photoconductivity, luminescence, ad thermoluminescence properties in PbMoO 4 in general, depend on the electron density distribution in the MoO 4 tetrahedron and PbO 8 octahedron. Hence, a complete analysis of the bonding interaction between Mo and O atoms in MoO 4 and Pb and O atoms in PbO 8 has been studied. The bonding between the atoms using the maximum entropy method (MEM) and bond length distribution using pair distribution function (PDF) has been analyzed. The valence state of oxygen atom is found to be responsible for the sensible properties in PbMoO 4. The particle size of PbMoO 4 is also analyzed using XRD and SEM. The band gap energy has also been calculated using UV-visible spectra. A study in terms of the local structure and electron density using versatile tools like MEM and PDF is lacking in literature. Hence this work complements these aspects. © 2011 Springer Science+Business Media, LLC.

Thirumalaisamy T.K.,Hkrh College | Saravanakumar S.,Kalasalingam University | Butkute S.,Vilnius University | Kareiva A.,Vilnius University | Saravanan R.,The Madura College
Journal of Materials Science: Materials in Electronics | Year: 2016

Nanocrystalline powders of cerium doped gadolinium gallium garnet (Gd3Ga5O12, GGG) powders were prepared by an aqueous sol–gel method. Effects of Ce doping on the microstructure, band gap energy and electron density distributions of the grown Gd3−xCexGa5O12 (x = 0.5, 1 and 3) have been studied by means of scanning electron microscopy, diffuse reflectance spectroscopy, X-ray diffraction techniques and the maximum entropy method (MEM). The mid bond densities between different atoms of Gd3−xCexGa5O12 (x = 0.5, 1 and 3) obtained from 1D electron density profiles are analyzed. © 2015, Springer Science+Business Media New York.

Robert M.C.,Hkrh College | Subha B.,The Madura College | Saravanan R.,The Madura College
Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences | Year: 2011

The average structure of the thermoelectric material indium antimonide (InSb) has been studied in terms of the electron density distribution using the single crystal X-ray intensity data. The charge density of this material has been studied including and excluding the quasi-forbidden h+ k + l = 4n+2 type reflections using the maximum entropy method (MEM). Both the pictorial and numerical results of the experimental electron density show mixed ionic and covalent character in InSb. The use of InSb as a thermoelectric material is supported through charge density analysis. © 2011 Verlag der Zeitschrift für Naturforschung, Tübingen.

Thirumalaisamy T.K.,Hkrh College | Saravanan R.,The Madura College | Saravanakumar S.,The Madura College
Journal of Materials Science: Materials in Electronics | Year: 2015

The fluorite type optical material Yb doped CaF2 was synthesized by the co-precipitation method. The synthesized materials with various Yb concentration were characterized by X-ray powder diffraction technique. The phase pure CaF2 was observed and the impurity doping effect was analyzed from the observed powder X-ray diffraction. The presence of Yb3+ in CaF2 materials was identified by energy dispersive X-ray analysis measurement and the morphological features were studied through scanning electron microscopy. The charge density distribution of Ca1−xYbxF2 (x = 0.00, 0.03, 0.06, 0.09 and 0.12) materials was analyzed using the maximum entropy method. The rearrangement of charge density distribution between Ca and F due to effect of Yb3+ impurity was analyzed. © 2015, Springer Science+Business Media New York.

Parthiban K.,Hkrh College | Manikandan S.,Madurai Kamaraj University | Ganesapandian S.,Madurai Kamaraj University
Asian Journal of Applied Sciences | Year: 2011

Bacterial cellulose essentially a high value special chemical with specific application and usage. Some is produced commercially as a source of highly pure polymer so called cellulose I. Current uses of bacterial cellulose are slowly gaining publicity with applications ranging from food additives and paper binding agents. The bacterial cellulose also used as temporary skin substitute. Modern medical biotechnology has accepted artificial skin as valid prospect. It has successfully applied by dermatologist and plastic surgeons. This can applied for human second and third degree skin burn, skin graft, face peeling, infectious dermolysis, trophic venous and chronic ulcers. The current study also aims to use the bacterial cellulose for the healing of wounds with slight alterations. Generally cellulose from Acetobacter xylenum was used for wound healing, but in this study cellulose from Rhizobium sp. was used. The bacterial cellulose is modified by mixing with alginate and examined their wound healing activity in experimental mice. © 2011 Knowledgia Review, Malaysia.

Manikandan S.,Madurai Kamaraj University | Ganesapandian S.,Madurai Kamaraj University | Parthiban K.,Hkrh College
Journal of Fisheries and Aquatic Science | Year: 2011

The distribution and zonation pattern of seagrass was assessed by SCUBA diving assisted with Global Positioning System (GPS) and 100 M transects at every 0.5 km, in the area between Mandapam and Thondi in the Palk Bay during March-July 2009. The study area has been divided into 3 regions, viz., Mandapam, Panaikulam and Thondi. Seagrass were distributed in about 175.2 km-2 coastlines in the study area. The percentage of seagrass distribution and species composition in Mandapam it was 63.87% in nearshore with 10 species, 43.56% in middle zone with 7 species and 26.27% in offshore with 4 species. Likewise in Panaikulam it was 24.17% in nearshore with 7 species, 53.31% in middle zone with 6 species and 20.14% in the offshore 5 species. Where as, in Thondi it was 75.41% in nearshore with 9 species, 54.28% in middle with 8 species and 31.42% in offshore with 7 species. Overall all the 14 species were observed among the Cymodocea serrulata was the most abundant species and the least was Enhalus acoroides in these study region. Shoot density and biomass of 14 species of seagrass and epiphytic biomass in different zonation were analyzed. This study gives clear cut idea about distribution and zonation of seagrass in Palk Bay region. © 2011 Academic Journals Inc.

Akilan T.,P.A. College | Charles Robert M.,Hkrh College | Saravanan R.,P.A. College
Materials Science Forum | Year: 2011

In this work, high vacuum (10 -6 Torr) annealed (at 500°C) samples of the thermoelectric materials Bi 2Te 3 and Sb 2Te 3 were analyzed in terms of local structures and electron density distribution. After annealing, the samples were analyzed for their structural properties using powder X-ray diffraction data. The electron density distribution has been analyzed using the MEM (maximum entropy method) and the precise bonding in Bi 2Te 3 and Sb 2Te 3 has been determined. Since Bi 2Te 3 and Sb 2Te 3 and their combinations are the latest high figure of merit thermoelectric materials, with immediate application in many fields, particularly the electrical power harvesting devices, a study on the local structure of these materials becomes important which has been carried out in this work. Also the particle size variation due to annealing effect is studied and reported and the bond distance between neighboring atoms in bismuth telluride and antimony telluride has been analyzed. © 2012 Trans Tech Publications, Switzerland.

Robert M.C.,Hkrh College | Saravanan R.,Hkrh College
Powder Technology | Year: 2010

The thermoelectric material Bi80Sb20 was grown by high temperature melt-quench growth method and characterized by powder XRD. The Rietveld refinements revealed the presence of Bi80Sb20 and also the elemental parents Bi and Sb. All the three phases were analyzed and the electron density distribution and local structure of Bi, Sb and Bi80Sb20 were individually studied. The bonding between the atoms was studied using maximum entropy method (MEM). A comparison of 3D and 2D electron density distributions of Bi, Sb and Bi80Sb20 on the (110) and (024) planes clearly shows highly concentrated and localized electron clouds in Bi80Sb20 supporting the use of BiSb alloy as a thermoelectric material. © 2009 Elsevier B.V. All rights reserved.

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