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Now showing items 1 - 5 of 5

  • A starch-assisted innovative synthesis of spinel-structured and ferromagnetic behaviour of Fe3O4 nanoparticles catalytic activity evaluated in the selective oxidation

    Geetha, V. T.   Puthilibai, G.   Induja, S.  

    In this research work, for several temperature based on Fe3O4 nanoparticles had been prepared by the sol-gel approach. The physicochemical properties of these catalysts were characterized by the X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy (TEM), diffused reflectance spectra, photoluminescence spectroscopy (PL) and vibrating sample magnetometer. Fe3O4 nanoparticles, TEM images and the XRD analysis designated that the chain-like Fe3O4 has a crystal phase of cubic lattice by way for a mean measurement of around 25 nm. The effect of catalyst and solvent on the catalytic oxidation of benzyl alcohol using the Fe3O4 catalyst prepared by sol-gel method was also investigated.
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  • Study of the effect of photoluminescence,structural and magnetic properties of Nd doped NdxNi1-xO (x=3D0.01,0.02 and 0.03) hexagonal particles

    Geetha, V. T.   Induja, S.   Puthilibai, G.  

    At ambient temperature, nickel oxide (undoped), as well as a variety of Nd-doped NiO, NdxNi1-xO (x =3D 0.01, 0.02 and 0.03) hexagonal-like particles, have been synthesized by employing a microwave synthesis approach. The synthesized samples properties were known by various instrumental techniques, for instance, XRD (X-ray diffraction), TEM and SEM (transmission and scanning electron microscopy), optical absorption, and photoluminescence (PL) methods. Nd doping increases the crystallite size. X-ray diffraction information of NiO indicates that substitution of Nd increases the lattice parameter and crystallite size. The surface morphology results showed that the distribution of homogeneous particles alongside aggregation that is caused by interactions of dipole-dipole. The as-synthesized samples' soft magnetic characters were examined.
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  • Effects on the Crystal Structure,Magnetic and Optical Properties Nd-Doped Co3O4 Nanoparticles Prepared by Microwave Synthesis

    Geetha, V. T.   Induja, S.   Puthilibai, G.  

    Optical and magnetic properties of Nd-doped Co3O4 are investigated by the microwave method. Nd-doped Co3O4 for structural, morphological, and photoluminescence properties were analyzed by using UV-visible spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Nd-doped Co3O4 magnetic nanoparticles were spherical in shape. The crystal/particle size of the nanoparticles is around 18-23 nm approximately. However, Nd-doped Co3O4 synthesis and the optical properties are correlated to their magnetic abilities, along with their performance when introduced to other properties from Nd (0.01, 002, and 0.03) dopants.
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  • Catalytic efficiency of copper oxide in degradation of phenol using sintered calcium phosphate (SCaP) as catalyst support

    Induja, S.   Raghavan, P.S.  

    For the first time sintered calcium phosphate is explored as catalyst-support, analogous to silica, alumina etc. The present work involves preparation of catalysts by depositing copper oxide over the sintered calcium phosphate using three techniques, viz., impregnation of CuO, impregnation of copper (II) nitrate & calcination, reduction of Cu2+ ions on the support & calcination. The above samples were characterized using XRD, UV-DRS, SEM-EDAX, BET surface area and acidity. Oxidation of phenol was studied with the above catalysts and sintered calcium phosphate was found to be an efficient catalyst-support. (C) 2012 Elsevier B.V. All rights reserved.
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  • Comprehensive Study on the Effect of CuO Nano Fluids Prepared Using One-Step Chemical Synthesis Method on the Behavior of Waste Cooking Oil Biodiesel in Compression Ignition Engine

    Velmurugan, Ramanathan   Mayakrishnan, Jaikumar   Induja, S.   Raja, Selvakumar   Nandagopal, Sasikumar   Sathyamurthy, Ravishankar  

    Vegetable oil is considered as one among the promising alternatives for diesel fuel as it holds properties very close to diesel fuel. However, straight usage of vegetable oil in compression ignition (CI) engine resulted in inferior performance and emission behavior. This can be improved by modifying the straight vegetable oil into its esters, emulsion, and using them as a fuel in CI engine showcased an improved engine behavior. Waste cooking oil (WCO) is one such kind of vegetable oil gained a lot of attraction globally as it is generated in a large quantity locally. The present investigation aims at analyzing various parameters of single cylinder four stroke CI engine fueled with waste cooking oil biodiesel (WCOB), waste cooking oil biodiesel water emulsion (WCOBE) while the engine is operated with a constant speed of 1500 rpm. Furthermore, an attempt is made to study the impact of nanofluids in the behavior of the engine fueled with WCOB blended with nanofluids (WCOBN50). This work also explored a novel method of producing nanofluids using one-step chemical synthesis method. Copper oxide (CuO) nanofluids were prepared by the above mentioned method and blended with waste cooking oil biodiesel (WCOBN50) using ethylene glycol as a suitable emulsifier. Results revealed that brake thermal efficiency (BTE) and brake specific fuel consumption (BSFC) of WCOBN50 are significantly improved when compared to WCOB and WCOBE. Furthermore, a higher reduction in oxides of nitrogen (NOx), carbon monoxide (CO), hydrocarbon (HC), and smoke emissions were observed with WCOBN50 on comparison with all other tested fuels at different power outputs. It is also identified that one-step chemical synthesis method is a promising technique for preparing nanofluids with a high range of stability.
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