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Jayanthi S.N.,Center for Material Science | Prabakaran A.R.,Pachaiyappas College | Subashini D.,Pachaiyappas College | Thamizharasan K.,Sir Theagaraya College
Materials Today: Proceedings | Year: 2015

L-histidinium perchlorate, a semi-organic crystal has been grown by slow evaporation solution growth technique at room temperature. The growth of L-histidinium perchlorate was confirmed by single crystal X-ray diffraction analyses. Results of indentation-induced hardness testing are presented. The Vicker's hardness of the material in the load range 10-100g was 29-59Kg/mm2. The values of elastic stiffness constant, fracture mechanics, brittleness index and yield strength have also been calculated. The dielectric measurements of the crystal in the frequency range 100Hz-1MHz were investigated. The activation energy of electrical processes was also calculated and reported. © 2015 Elsevier Ltd. Source

Sumithra Devi M.,Anand Institute of Higher Technology | Arthi A.P.,Thangavelu Engineering College | Thamizharasan K.,Sir Theagaraya College
Superlattices and Microstructures | Year: 2014

Single crystal of semiorganic nonlinear optical material of pure and Mg2+ doped ZTS were grown by slow evaporation technique from its aqueous solution. The grown crystal was characterized by single crystal XRD to determine the cell parameters. The Mg2+ doped was characterized by SEM and EDX spectrum. The chemical composition of both the pure ZTS and doped Mg2+ crystals were determined by Fourier transform infrared (FTIR). The optical absorption spectrum recorded in the wavelength was ranged from 200 to 2500 nm and its energy gap (Eg) for both pure ZTS is 4.47 eV and doped Mg2+ is 4.42 eV. The mechanical strength of the grown crystal was found from Vicker's microhardness measurements. It showed that pure and doped ZTS crystals are soft in nature. The dielectric measurement was carried out to study the different polarization mechanism and conductivity of the crystal. Photoconductivity studies revealed that the positive photoconductivity of the both were considered as grown crystals. © 2014 Elsevier Ltd. All rights reserved. Source

Rajendran A.,Sir Theagaraya College | Mansiya C.,Bharathiar University
Ecotoxicology and Environmental Safety | Year: 2015

The study of changes in ground water quality on the east coast of chennai due to the December 26, 2004 tsunami and other subsequent disturbances is a matter of great concern. The post-Tsunami has caused considerable plant, animal, material and ecological changes in the entire stretch of chennai coastal area. Being very close to sea and frequently subjected to coastal erosion, water quality has been a concern in this coastal strip, and especially after the recent tsunami this strip seems to be more vulnerable. In the present investigation, ten ground water samples were collected from various parts of south chennai coastal area. Physico-chemical parameters such as pH, temperature, Biochemical oxygen demand (BOD), Dissolved oxygen (DO), total solids; turbidity and fecal coliform were analyzed. The overall Water quality index (WQI) values for all the samples were found to be in the range of 68.81-74.38 which reveals a fact that the quality of all the samples is only medium to good and could be used for drinking and other domestic uses only after proper treatment. The long term adverse impacts of tsunami on ground water quality of coastal areas and the relationships that exist and among various parameters are carefully analyzed. Local residents and corporation authorities have been made aware of the quality of their drinking water and the methods to conserve the water bodies. © 2015 Elsevier Inc. Source

Vijayaraghavan K.,Bharath University | Nalini S.P.K.,Sir Theagaraya College | Prakash N.U.,Tamil University | Madhankumar D.,Marina Labs
Colloids and Surfaces B: Biointerfaces | Year: 2012

A novel biosynthesis route for silver nanoparticles (Ag-NPs) was attempted in this present investigation using aqueous extracts of Trachyspermum ammi and Papaver somniferum. The main constituents in T. ammi are thymol, p-cymene and γ-terpinene, while P. somniferum consists of morphine and codeine. The essential oil in T. ammi was found to be a good reducing agent than the alkaloids present in P. somniferum for the formation of biocompatible Ag-NPs. The effectiveness of both the extracts was investigated by using same dosage of extract in the synthesis of silver nanoparticle. The results showed that for the same dosage of extracts the T. ammi synthesized various size triangular shaped nanoparticles measuring from 87. nm, to a fewer nanoparticles having a size of 998. nm diagonally. P. somniferum resulted in almost spherical shaped particle ranging in size between 3.2 and 7.6 μm diagonally. Future research based on synthesis of size specific nanoparticle based on the optimization of reaction condition would be an interesting area. © 2012 Elsevier B.V. Source

Ragupathy D.,University | Lee S.C.,Kyungpook National University | Al-Deyab S.S.,King Saud University | Rajendran A.,Sir Theagaraya College
Journal of Industrial and Engineering Chemistry | Year: 2013

We report a facile and surfactant assisted synthesis of polyaniline microrods (PANI-MR) by "single-step chemical oxidative polymerization" method. The morphology of the PANI-MR was investigated by field-emission scanning electron microscopy (FE-SEM). The average diameter of single PANI-MR was calculated to be ∼1.3 μm. The physiochemical characterization was examined using UV-visible spectroscopy, Fourier transform infrared spectroscopy and cyclic voltammetry. The electrical conducting property of the PANI-MR was analyzed using four-probe measurement method. © 2012 The Korean Society of Industrial and Engineering Chemistry. Source

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