Karaikkudi, India

Central Electro Chemical Research Institute is one of a chain of forty national laboratories under the aegis of the Council of Scientific and Industrial Research in New Delhi. Founded on 25 July 1948 at Karaikudi in Tamil Nadu, CECRI came into existence on the January 1953. During the last fifty years CECRI has been recognized as the premier institution for research and development in electrochemical science and technology not only in India but also in the South East Asia, with a total strength of over 600 personnel comprising scientists, engineers, technologists, skilled workers, administrative and other staff, with a combined laboratory space of 400,000 sq ft . in a campus of 300 acres . There are four extension centers for CECRI, located at Chennai, Cochin, Mandapam and Tuticorin.Major R&D programs at CECRI are in the areas of corrosion science and engineering, industrial metal finishing, batteries , electrometallurgy, electropyrometallurgy, electrochemicals , Materials Science, and electrochemical instrumentation & pollution control. The programs are directed towards development of new processes or products or novel use of electrochemistry. Techniques, upgrading of the already developed technology, and basic research are carried out. An excellent library, computer center, workshop, and centralized characterization and measurement laboratory lend active support. Wikipedia.

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Dharuman N.,Urumu Dhanalakshmi College | John Berchmans L.,Control Electrochemical Research Institute
Ceramics International | Year: 2013

Nano-crystalline Gadolinium Titanate (Gd2Ti2O 7) powder was successfully synthesized by "Single Step Molten Salt Technique". LiCl-KCl eutectic mixture was used as a molten medium for the reaction. The duration of the synthesis was 10 h. Stoichiometric proportion of the reactants were mixed in an (LiCl-KCl) eutectic medium and treated at 750 C in an electrical resistance furnace. Single phase Gadolinium Titanate compound was obtained by the thermal process. The synthesized powders were characterized using XRD, FT-IR, UV, EDAX and XPS analyses. The morphology of the powder was examined using SEM and TEM techniques. From the above studies, it has been concluded that pure crystalline Gadolinium Titanate powders can be synthesized via low temperature molten salt process. © 2013 Elsevier Ltd and Techna Group S.r.l.

Athijayamani A.,Alagappa Chettiar College of Engineering And Technology | Natarajan U.,Alagappa Chettiar College of Engineering And Technology | Pazhanivel B.,Control Electrochemical Research Institute
Polymer Composites | Year: 2010

In this work, the alkali-treated roselle and sisal fiberswere used as reinforcement fillers for thermosettingmatrix with aim of obtaining better mechanical properties and machinability of natural fiber hybrid polyester composite. However, their mechanical properties and machinability were compared with untreated fiber composites. The roselle and the sisal fibers were subjected to a 10% sodium hydroxide solution treatment at different duration of 2, 4, 6, and 8 h. Besides, the fractured surfaces of composite specimen were investigated using scanning electron microscopy. Drill hole profiles were analyzed using profile projector and machine vision inspection system. An improvement in strength and stiffness combined with high toughness was achieved by treating the fibers using 10% NaOH solution. POLYM. COMPOS., 31:723-731, 2010. © 2009 Society of Plastics Engineers.

Suryanarayanan V.,Control Electrochemical Research Institute | Wu C.-T.,National Taiwan University | Ho K.-C.,National Taiwan University
Electroanalysis | Year: 2010

In this review, the applications of molecularly imprinted polymer (MIP) materials in the area of electrochemical sensors have been explored. The designs of the MIPs containing different polymers, their preparation and their immobilization on the transducer surface have been discussed. Further, the employment of various transducers containing the MIPs based on different electrochemical techniques for determining analytes has been assessed. In addition, the general protocols for getting the electrochemical signal based on the binding ability of analyte with the MIPs have been given. The review ends with describing scope and limitations of the above electrochemical based MIP sensors. © 2010 Wiley-VCH Verlag GmbH&Co. KGaA, Weinheim.

Joseph Sharkey J.,Control Electrochemical Research Institute | Yoo C.,Kyung Hee University | John Peter A.,Government Arts and Science College
Superlattices and Microstructures | Year: 2010

The binding energies of a hydrogenic donor in a GaN/AlGaN quantum dot are calculated in the influence of magnetic field. The calculations are carried out using the single-band effective mass approximation within a variational scheme. The magnetic field induced binding energy and diamagnetic susceptibility of the hydrogenic donor are obtained as a function of dot radius. Calculations have been carried out with and without the Zeeman effect through the energy-dependent effective mass. The diamagnetic shift of the hydrogenic donor is found for different dot radii. Our results show that (i) the binding energy is higher for smaller dot radii and the magnetic field effects are predominant for larger dot sizes, (ii) the binding energy is higher when the Zeeman effect is included for all the magnetic fields, (iii) the diamagnetic susceptibility increases with the magnetic field and is not pronounced for smaller dot radii and (iv) the diamagnetic shift has a good influence of larger dot radii. © 2010 Elsevier Ltd.

Gopal Ram S.D.,Alagappa University | Anbu Kulandainathan M.,Control Electrochemical Research Institute | Ravi G.,Alagappa University
Applied Physics A: Materials Science and Processing | Year: 2010

The rapid synthesis of ZnO nanostructures by microwave treatment of aqueous solutions of different pH values is reported for the first time. Microwave in various wattages was used as the source of heating or energy feeding the aqueous precursors. The pH of the zinc metal source was altered by a suitable amount of mineralisers. The considered pH values are 8, 10, 12 and 13.5. Microwave dielectric heating is dependent on the ability of the material to absorb microwave. This is responsible for molecular friction and dielectric loss, which as a result produce internal heating of the dielectric medium, in this case the solution. In typical microwave assisted synthesis, the total exposure to the microwave treatment was near about 25 to 35 minutes. The ZnO nanostructures obtained were studied by XRD, SEM and TEM characterisations. From the XRD pattern and the full width half maximum of the dominant reflections, microstructural parameters of the nanostructures are calculated and compared for the different pH values. Flower petal like flakes and hexagonal nanorods are formed for the lower and higher pH solutions, respectively. From the SEM images, the size distributions for the pH 12 and 13.5 cases are compared by drawing a histogram. © Springer-Verlag 2009.

Murugavel K.,Control Electrochemical Research Institute
Polymer Chemistry | Year: 2014

Here, the synthesis of benzylic viologen dendrimers, their guest complexation, photophysical and biological applications have been reviewed. Divergent and convergent approaches reported by Walder et al. and Balzani et al. for the synthesis of benzylic viologen dendrimers are also discussed. Electron sponge behaviour and their use as electron storage devices are elaborated. In addition, CT (charge transfer) complexation with guest anionic dye molecules and their use as charge storing devices are discussed. It has been shown that these dendrimers sequentially complex organic anions guided through molecular recognition. Anions with matching symmetry showed sharp chemical shifts in 1H NMR titration studies. The existence of a potential gradient is explained for such a preferential complexation mechanism. Thus, the sequential complexation of organic anions inside these dendrimers as confirmed by 1H NMR titration studies are briefly discussed. Further, the biological applications focusing on their antiviral, antibacterial and antifungal activities reported so far have been addressed. This journal is © the Partner Organisations 2014.

Neelavannan M.G.,Control Electrochemical Research Institute | Basha C.A.,Control Electrochemical Research Institute
Environmental Technology | Year: 2011

A thin wetted film cylindrical flow reactor was fabricated for photocatalytic oxidation of Procion blue H-B dye in textile washwater with the suspensions of TiO 2 and ZnO. The disappearance of colour and organic reduction were studied in terms of the removal of colour and chemical oxygen demand (COD). Operating parameters such as effect of pH, UV irradiation with and without catalyst, initial concentration of dye and effect of flow rate were studied and kinetics of Procion blue H-B dye has been studied over TiO 2 and ZnO surfaces. Since adsorption is the prerequisite condition for decolorization/degradation of dye molecules in the presence of heterogeneous catalysis, the Langmuir and Freundlich isotherms were examined to verify the adsorption intensity. The results clearly demonstrated that, the optimum loading of the photocatalyst was found to be 300 and 400 mg/L of TiO 2 and ZnO, respectively. The maximum COD reduction efficiency was 68% for TiO 2 and 58% for ZnO. On the other hand, the colour removal efficiency was found to be 74% and 69%, respectively for TiO 2-and ZnO-assisted systems under optimum conditions. Conclusively, these two semiconductors could degrade Procion blue H-B dye at different time intervals and both isotherms fit well. © 2011 Taylor & Francis.

Radhakrishnan S.,Control Electrochemical Research Institute | Jagannathan R.,Control Electrochemical Research Institute
Der Pharma Chemica | Year: 2013

The purpose of this paper is to study the effect of size-variation of EuMnO3 particles on Nuclear Magnetic Resonance (NMR) phenomenon. The EuMnO3 particles have been synthesized through solid state reactions resulting in micrometer (μm) particle sizes (designated as bulk). The particles have also been synthesized through sol-gel combustion resulting in nanometer (nm) particle sizes which have been designated as 'nano'. NMR spectral measurement, SEM & TEM imaging were used to characterize the resultant manganite ceramics. We compared both bulk and nanoparticle samples using NMR spectroscopy. In general, the NMR spectral line width showed a general broadening trend as the size decreased. But there was also evidence of a size dependent effect in chemical shift and in the spin-spin relaxation. The investigated details include the structure, homogeneity and particle size.

Neelavannan M.G.,Control Electrochemical Research Institute | Basha C.A.,Control Electrochemical Research Institute
Toxicological and Environmental Chemistry | Year: 2010

The photocatalytic degradation of Procion blue H-B dye in biodegraded textile washwater has been investigated for the complete removal of color and maximum reduction of chemical oxygen demand (COD). Pseudomonas putida was utilized for obtaining biodegraded textile washwater. In this process, silver-doped TiO2 photocatalyst was prepared and experiments were carried out to study the effects of UV and mercury lamp irradiations on COD reduction and removal of color. The thus prepared silver-doped TiO2 catalyst was characterized by thermogravimetric and differential thermal analysis, UV-visible spectrometer, X-ray diffraction, scanning electron microscope, energy dispersive X-ray microanalysis, and BET surface area techniques. Adsorption studies were also carried out to evaluate the fitness of isotherm models. The results show that the silver-doped TiO2 has enhanced the photodegradation of Procion blue H-B dye under UV and mercury lamp irradiations. The enhanced activity of silver-doped TiO22 is due to the enrichment of electron-hole separation by electron trapping of silver particles. © Taylor & Francis.

Kumar S.K.,Control Electrochemical Research Institute | Amutha R.,Control Electrochemical Research Institute | Arumugam P.,Control Electrochemical Research Institute | Berchmans S.,Control Electrochemical Research Institute
ACS Applied Materials and Interfaces | Year: 2011

This work describes a bioassisted approach for the preparation of metal nanoparticles using yeast species Hansenula anomala. Gold nanoparticles were prepared using gold salt as the precursor, amine-terminated polyamidoamine dendrimer as the stabilizer, and the extracellular material from H. anomala as the bioreductant. It could also be demonstrated that, using our approach, small molecules such as cysteine can act as stabilizers as well. This synthetic approach offers a greener alternative route to the preparation of gold sols that are devoid of cellular and toxic chemical components. The ability of as-synthesized gold sol to function as biological ink for producing patterns for the analysis of fingerprints and to act as an antimicrobial reagent is evaluated. The generality of this toxin-free synthetic approach to other metals was assessed using palladium and silver. © 2011 American Chemical Society.

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