Sir Theagaraya College

Chennai, India

Sir Theagaraya College

Chennai, India
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Thamizharasan K.,Sir Theagaraya College
Materials Today: Proceedings | Year: 2017

A semi-organic single crystal of DL-methionine doped copper sulphate has been grown by slow evaporation solution growth technique. Lattice parameter of the grown crystal was confirmed by single crystal x-ray diffraction analysis. Vicker's microhardness indentation tests were carriedout with the load ranging from 10-100gm. Mechanical parameters like fracture toughness (Kc), brittleness index (Bi), yield strength (σy) and elastic stiffness constant (C11) were calculated and reported. © 2017 Elsevier Ltd. All rights reserved.

Askar Ali S.J.,P.A. College | Rajendran A.,Sir Theagaraya College
Journal of Chemical and Pharmaceutical Research | Year: 2011

The study of propagation of ultrasonic waves in liquids and liquid mixtures in very much usefulfor examining the nature of intermolecular interactions in chemical systems. Ultrasonic velocityis an important physical parameter which mainly depends on the structure of molecules. In thepresent investigation, ultrasonic velocities have been measured in binary mixtures of (i)Methanol - Chlorobenzene, (ii) Ethanol - Chlorobenzene and (iii) 1-Propanol - Chlorobenzeneto understand the molecular interactions. Various models have been employed to calculate theacoustical parameters in order to substantiate these interactions. The various acousticparameters such as adiabatic compressibility, free length, acoustic impedance, relaxation time,free volume, available volume and internal pressure were also measured to substantiate theseinteractions. Many interesting features were observed and they are carefully discussed.

Rajendran A.,Sir Theagaraya College
International Journal of PharmTech Research | Year: 2011

Air dried flowers of Nerium oleander and Tecoma stans have been investigated for their polyphenolics. The pigments have been found to myricetin and rutin respectively which were characterized by chromatography and spectral studies. These pigments were screened for their antibacterial and antifungal activity against different organisms. It was ascertained that the ethyl acetate fractions of flowers of both the plants are highly sensitive to staphylococcus aurcus, staphylococcus albus and klebsiella sp and moderately sensitive to pseudomonas and protecs sp. They were also found to be active antifungal agents against Candida albicans, Aspergillus niger. The extracts were also tried as corrosion inhibitors on mild steel and aluminium in 2M HCl at 30 ± 1°C. It was found that the percentage of inhibition increases with the increase in volume/concentration of the extracts.

Kumar G.V.,Bharathiar University | Rajendran A.,Sir Theagaraya College
Synthetic Communications | Year: 2016

An effective and simple protocol for the Diels–Alder reactions catalyzed and mediated by ionic liquid in conjunction with Lewis acid was studied. Diels–Alder adduct of the reaction of 1,4-benzoquinone with isoprene and 2,3-dimethyl-1,3-butadiene was obtained in good to excellent yields within the time span of 5.00–4.00 min under microwave irradiation. Due to the excellent activity of 2,3-dimethyl-1,3-butadiene as a diene, its efficiency was further analyzed by performing against four different dienophiles under various reaction conditions. The ionic liquid, 3-methyl-1-octyl-imidazolium tetrachloroaluminate mixed with Lewis acids, could be recycled and reused for consecutive cycles. The recovered ionic liquid in conjunction with Lewis acid displayed almost similar activity without any significant loss. This system is an essential upgrade and related to the reactions consuming common organic solvents at high temperatures and longer duration. Diels–Alder reactions under solventless conditions have also been investigated for the aforesaid reactions. 2016 Copyright © Taylor & Francis Group, LLC

Rajendran A.,Sir Theagaraya College | Karthikeyan C.,Sir Theagaraya College
Ionics | Year: 2011

Novel Lewis acidic ionic liquids containing thionyl cations and chlorozincate anions were obtained by one pot synthesis for the first time. This ionic liquid is used as catalyst for Friedel-Crafts alkylation of benzalazines and acetophenone azines for the synthesis of substituted diaryl alkanes. The products were characterized by elemental and spectral (FT-IR, 1H-NMR and 13C-NMR) analyses. © 2011 Springer-Verlag.

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.

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.

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.

Brundha B.A.,Sir Theagaraya College | Pazhanisamy P.,Sir Theagaraya College
International Journal of ChemTech Research | Year: 2010

A series of ionic poly(N-tert-amylacrylamide -co -acrylamide/maleic acid) Hydrogels were synthesized by free-radical copolymerization in Water/Methanol medium using Ammonium persulfate (APS) as the initiator and N,N-methylenebisacrylamide (MBA) as a crosslinker at 60°C. The amount of N-tert-amylacrylamide (NTA) and Acrylamide (AM) monomers was fixed and the amount of Maleic acid (MA)was varied. The Hydrogels were characterized by IR spectroscopy. The swelling behavior of Hydrogels studied by Gravimetric method and degree of swelling was increased by increasing the amount of Maleic acid. The surface morphology was studied by SEM analysis.

Vijayaraghavan K.,Bharath University | Nalini S.P.K.,Sir Theagaraya College | Prakash N.U.,Tamil University | Madhankumar D.,Marina Labs
Materials Letters | Year: 2012

The present investigation deals with the synthesis of silver nanoparticles (AgNPs) by green synthesis that has advantages over conventional methods involving chemical agents associated with environmental toxicity. Green synthesis method involves the use of Syzygium aromaticum extract in the universal solvent namely water. The reaction process was simple and convenient to handle, and was monitored using ultraviolet-visible spectroscopy (UV-vis). The results were promising and rapid in the production of silver nanoparticle with a surface plasmon resonance occurring at 430 nm. The formed nanoparticles ranged in dimension between 20 and 149 nm which was almost spherical in shape. EDAX confirmed that the formed nanoparticles are silver as the optical absorption peak was observed approximately at 3 keV, which is typical for the absorption of metallic silver nanocrystallites. © 2012 Elsevier B.V. All rights reserved.

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