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Ramachandran, K.,Zahoor, A.,Raj Kumar, T.,Nahm, K.S.,Balasubramani, A.,Gnana Kumar, G. Korean Society of Industrial and Engineering Chemi 2017 Journal of industrial and engineering chemistry Vol.46 No.-
<P>The tetragonal alpha-phase structured manganese dioxide nanorods were densely grown over the nitrogen doped graphite nanofibers (NGNF/MnO2) via a facile and one-pot hydrothermal technique. The amperometric results depicted that NGNF/MnO2 composite exhibited a high sensitivity of 1096 mu A mM(-1) cm(-2) and a wide linear range from 0.1 to 11 mM with the lower detection limit of 1.25 mu M toward the non-enzymatic hydrogen peroxide (H2O2) detection, owing to the synergistic effects of NGNF and MnO2. In the prospect of excellent selectivity, real sample analysis and other striking advantages, the developed non-enzymatic sensors hold promising potential for the tight monitoring of H2O(2) in the food and clinical diagnosis fields. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
K. Ramachandran,D. Kalpana,Y. Sathishkumar,이양수,K. Ravichandran,G. Gnana Kumar 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
A facile, one-pot and environmental benign method exploiting Piper betle biomass as a reducing andstabilizing agent was proposed for the preparation of silver (Ag) nanoparticles. The Ag nanoparticlesprepared from dried Piper betle leaves extract exhibited unique spherical configuration and facecentered-cubic structure with preferred (1 1 1) orientation. The fabricated Ag/GCE sensor exhibited anexceptional electrocatalytic activity toward NO2 oxidation with a quick response time, high sensitivityand lower detection limit of 10 s, 1642.27 mAm M 1 cm 2 and 0.046 mM, respectively. Furthermore, theconstructed sensor exhibited long-term stability and excellent anti-interference properties, paving newdimensions for the utilization of bio-mediated nanocatalysts in electrochemical sensors.
K. Ramachandran,Awan Zahoor,T. Raj Kumar,남기석,A. Balasubramani,G. Gnana Kumar 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
The tetragonal a-phase structured manganese dioxide nanorods were densely grown over the nitrogendoped graphite nanofibers (NGNF/MnO2) via a facile and one-pot hydrothermal technique. Theamperometric results depicted that NGNF/MnO2 composite exhibited a high sensitivity of1096 mAmM 1 cm 2 and a wide linear range from 0.1 to 11 mM with the lower detection limit of1.25 mMtoward the non-enzymatic hydrogen peroxide (H2O2) detection, owing to the synergistic effectsof NGNF and MnO2. In the prospect of excellent selectivity, real sample analysis and other strikingadvantages, the developed non-enzymatic sensors hold promising potential for the tight monitoring ofH2O2 in the food and clinical diagnosis fields.
Synthesis, Structural Characterization, and Catalytic Activity of Flower Like ZnO Nanostructures
K. Ramachandran,G. Gnana Kumar,Ae Rhan Kim,Dong Jin Yoo 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
Tageteserecta flower like zinc oxide nanostructures composed of hexagonal nanorods were synthesized via sonochemical method at room temperature. The synthesized nanomaterials exhibited wurtzite hexagonal phase structure with the single crystalline nature. The diameter of the individual nanorods that constitute the flower shaped zinc oxide structures is in the range of 120-160 nm. The sonication time effectively determined the morphological properties of the prepared materials. The catalytic activity of prepared zinc oxide nanostructures towards N-formylation reactions were evaluated without any surface modification and the nanostructures exhibited good reaction yield with the prompt recyclability behavior.
Dielectric Study of Methyl Acrylate-Alcohol Mixtures Using Time Domain Reflectometry
K. Dharmalingam*,K. Ramachandran,P. Sivagurunathan,B. Prabhakar Undre,P. W. Khirade,S. C. Mehrotra 대한화학회 2006 Bulletin of the Korean Chemical Society Vol.27 No.12
Dielectric studies of methyl acrylate with 1-propanol, 1-butanol, 1-heptanol and 1-octanol binary mixtures have been carried out over the frequency range from 10 MHz to 10 GHz at temperatures of 283, 293, 303 and 313 K using Time Domain Reflectometry (TDR) for various concentrations. The Kirkwood correlation factor and excess inverse relaxation time were determined and discussed to yield information on the molecular structure and dynamics of the mixture. The values of the static dielectric constant, relaxation time and the Kirkwood correlation factor decrease with increased concentration of methyl acrylate in alcohol. The Bruggman plot shows a non-linearity of the curves for all the systems studied indicates the heterointeraction which may be due to hydrogen bonding of the OH group of alcohol with C=O of the methyl acrylate. The excess inverse relaxation time values are negative for all the systems at all the temperatures indicates that the solute-solvent interaction hinders the rotation of the dipoles of the system.
Synthesis, Structural Characterization, and Catalytic Activity of Flower Like ZnO Nanostructures
Ramachandran, K.,Kumar, G. Gnana,Kim, Ae Rhan,Yoo, Dong Jin Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
Tageteserecta flower like zinc oxide nanostructures composed of hexagonal nanorods were synthesized via sonochemical method at room temperature. The synthesized nanomaterials exhibited wurtzite hexagonal phase structure with the single crystalline nature. The diameter of the individual nanorods that constitute the flower shaped zinc oxide structures is in the range of 120-160 nm. The sonication time effectively determined the morphological properties of the prepared materials. The catalytic activity of prepared zinc oxide nanostructures towards N-formylation reactions were evaluated without any surface modification and the nanostructures exhibited good reaction yield with the prompt recyclability behavior.
Dielectric Study of Methyl Acrylate-Alcohol Mixtures Using Time Domain Reflectometry
Dharmalingam, K.,Ramachandran, K.,Sivagurunathan, P.,Prabhakar , B.,Khirade, P.W.,Mehrotra, S.C. Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.12
Dielectric studies of methyl acrylate with 1-propanol, 1-butanol, 1-heptanol and 1-octanol binary mixtures have been carried out over the frequency range from 10 MHz to 10 GHz at temperatures of 283, 293, 303 and 313 K using Time Domain Reflectometry (TDR) for various concentrations. The Kirkwood correlation factor and excess inverse relaxation time were determined and discussed to yield information on the molecular structure and dynamics of the mixture. The values of the static dielectric constant, relaxation time and the Kirkwood correlation factor decrease with increased concentration of methyl acrylate in alcohol. The Bruggman plot shows a non-linearity of the curves for all the systems studied indicates the heterointeraction which may be due to hydrogen bonding of the OH group of alcohol with C=O of the methyl acrylate. The excess inverse relaxation time values are negative for all the systems at all the temperatures indicates that the solute-solvent interaction hinders the rotation of the dipoles of the system.
Towards More Realistic Physical Design Models for High-Level Synthesis
Ramachandran,Champaka,Jha, Pradip K.,Kurdahi, Fadi J.,Dutt, Nikil D. 대한전자공학회 1993 ICVC : International Conference on VLSI and CAD Vol.3 No.1
High level synthesis has long relied on point models for RT level components, where the area and delay of a component are assumed to be constant for a given style. Nowadays, many synthesis algorithms attempt to incorporate physical design information into the design process so as to better guide the synthesis tasks. In this work, we explore the combined effect of style and aspect ratio variations on the area and delay of RT level components, and on RT level designs which use such components. Our results indicate that point models are inadequate, for use in the synthesis process due to the large variations in the area and delay that occur when component styles and aspect ratios are varied. We believe that our results have some deep implications with respect to the flow of the design tasks during high level synthesis.
K. Nithya,Asha Sathish,P. Senthil Kumar,T. Ramachandran 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
Superparamagnetic iron oxide nanoparticles were synthesized using co-precipitation technique by dissolving required stoichiometric proportions (1:2) of Fe2+ and Fe3+ salts in water. Lantana camara extract and ammonia solution were used as the stabilizing and precipitating agents, respectively. The prepared particles were characterized using FTIR, TGA, PSA, SEM–EDAX and zeta potential analysis. This material was successfully adopted for the removal of Ni(II) ions from aqueous solution and the process parameters were optimized. The results indicated the faster kinetics and a remarkably higher adsorption capacity of 227.20 mg/g at a pH of 6.0 and an adsorbent dose of 0.05 g.