http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
G. Rajesh Kannan,P. Sathiya,T. Deepan Bharathi Kannan,M. Bhuvanesh Kumar 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.9
In this work, the technique of spin arc welding has been used to weld HSLA steel of grade 15CDV6. Experiments wereperformed according to the L9 Taguchi matrix using current, travel speed, wire feed rate, and spin rotation speed as inputparameters. The quality of the weld was analysed by measuring the bead geometry and microhardness. The Whale OptimizationAlgorithm (WOA) was used to identify the optimized welding parameters. The optimised parameters were identifiedthrough WOA as follows: current 230 A, voltage 24 V, travel speed 720 mm/min, and spin rotation speed 1500 rpm. Thepost-weld heat treatment (PWHT) was performed on the optimised welded sample to enhance the weld properties. Themicrohardness was increased by 79% after PWHT. Ferrite content was found to have reduced after welding and PWHT thegrain size and structure of the BM, HAZ, and WM were analysed by EBSD technique. The decrease in ferrite content hada significant effect on the microhardness. The Energy Dispersive Spectroscopy results showed the presence of Vanadiumcarbide (VC) precipitates which helped in increasing the microhardness.
Electrochemical Polymerization of Ruthenium(II) Complex and Application to Acetaminophen Analysis
Kannan, Sethuraman,Son, Jung-Ik,Yang, Jee-Eun,Shim, Yoon-Bo Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.4
A novel ruthenium(II) complex, [$RuCl_2(DMSO)_2$(PhenTPy)] has been synthesized by the condensation of $RuCl_2(DMSO)_4$ with (1-(1,10-phenanthrolinyl)-2,5-di(2-thienyl)-1H-pyrrole)[PhenTPy] in $CHCl_3$ solution. The [$RuCl_2(DMSO)_2$(PhenTPy)] complex modified electrode was fabricated through the electropolymerization of the monomer in a 0.1 M tetrabutylammonium perchlorate (TBAP)/$CH_2Cl_2$ solution, to take advantage of the electronic communication between metal ion center by the conjugated backbone. The UV-visible spectroscopy (UV), mass spectrometry (MS), and cyclic voltammetry (CV) were employed to characterize the [$RuCl_2(DMSO)_2$(PhenTPy)] complex and its polymer (poly-Ru(II)Phen complex). The poly-Ru(II)Phen complex modified electrode exhibited an electrocatalytic activity to the oxidation of acetaminophen and the catalytic property was used for the analysis of acetaminophen at the concentration range between 0.09 and 0.01 mM in a phosphate buffer solution (pH 7.0).
Kannan, S.,Venkatachalam, G.,Lee, H.J.,Min, B.K.,Kim, W.,Koo, E.,Do, Y.R.,Yoon, S. Pergamon Press 2011 Polyhedron Vol.30 No.2
The metal coordination geometry in the active site of metalloproteins are very different from the one of small inorganic complexes, due to the inflexibility of the ligand set from amino acid side chains different from freely moving ligand set in synthesis. Using the sterically hindered 2,6-di-(p-fluorophenyl)benzoate(L) ligand, a series of mononuclear Co(II), Ni(II) and Cu(II) complexes of general formula [M(L)<SUB>2</SUB>(Hdmpz)<SUB>2</SUB>] (where, Hdmpz=3,5-dimethyl pyrazole) have been synthesized and characterized by the variety of spectroscopic methods. A distorted octahedral geometry in case of nickel, tetrahedral geometry for cobalt and square pyramidal in copper was observed in the X-ray studies, which also revealed that the uncoordinated oxygen atom of the carboxylate group forms intramolecular hydrogen bonding with the N-H group of the coordinated 3,5-dimethylpyrazole in case of cobalt and copper.
Kannan Karunakaran,Muthuraman Govindan,문일식 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.42 No.-
A combination of potential widening and electrocatalyst bimetallic oxide CoOx/PbO2 was chemicallysynthesized at room temperature for the first time. Nano-metals of Pb and Co were synthesized by usingNaBH4 in presence of surfactant solution, then the respective metal oxides made by addition of NaOCl. Analyses results obtained by XRD, SEM, TEM, XPS, UV-Visible, and FTIR indicated the resulting productswere PbO2 and CoOx. The mixed CoOx/PbO2 oxide prepared in this manner demonstrated a crystallinemorphology. CoOx/PbO2 mixed oxides with different Co to Pb ratios were investigated to understandwhether the prepared CoOx/PbO2 oxides are in guest/host stack arrangement. XRD, XPS, and TEManalyses of at a Pb to Co ratio of 1:1 ratio revealed the formation of bimetallic oxides of CoOx/PbO2 androd like morphology of pure CoOx turned to spherical like morphology with PbO2 demonstrated CoOx asguest of PbO2. For CoOx/PbO2 produced at higher Co to Pb ratios CoOx dominated the surface, meaningPbO2 was a guest of CoOx. The described optimized method provides a straightforward, convenient wayof synthesizing nano-mixed metal oxides at low temperature.
Kannan, Narayanan,Hong, Sang-Hee,Oh, Jae-Ryoung,Yim, Un-Hyuk,Li, Donghao,Shim, Won-Joon Korean Chemical Society 2005 Bulletin of the Korean Chemical Society Vol.26 No.4
Measurement of toxicologically relevant polychlorinated biphenyl (PCB) congeners such as non-ortho(IUPAC#) 77, 81, 126, 169 and mono-ortho 105, 114, 118, 123, 156, 157, 189 and di-ortho 170, 180 and polybrominated diphenyl ethers (PBDEs) such as 47, 66, 85, 99, 100, 138, 153, 154 in environmental samples become almost mandatory in several countries now. However, most of the available methods involve expensive instrumentations such as HRGC-HRMS or ECNI-LRMS, apart from expensive extraction and clean-up (with large volume of solvents) steps. A method has been devised combining the analytical separation power of PYE [2-(1-pyrenyl)ethyldimethysilylated silica] column HPLC and high-resolution gas chromatographic techniques including micro-electron capture detection (ECD) and two dimensional gas chromatograpy-ECD techniques to determine these eco-toxic substances at parts-per-trillion (ppt) levels. This combination resolves co-elution of congeners that occur in disproportionate ratios (e.g. CB-110 and -77) and allows accurate congener-specific determination of target compounds. This method is cost effective as it requires only hexane, that in small quantities (10 mL) and GC-ECD. The elution and analysis time are optimized to less man hours. This method is effectively utilized in the analysis of co-planar PCBs and PBDEs from archived solvent extracts of samples previously analyzed for pesticides and PCBs. Structure based separation of contaminant classes improves GCECD determination at ppt levels.
( Kannan Karunakaran ),( Subramanian Balaji ),문일식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
The room temperature ionic liquids (RTILs) find use in many electrochemical applications such as electro deposition, development of gas sensors, organic synthesis, catalysis, solar cells and batteries, synthesis of novel nanostructured materials etc., due to their unique physicochemical properties. In the present report, we present the results of benzene oxidation catalyzed by Co(II) dissolved in N-butyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([bmpyr]+[TFSI]-). In this reaction Co(II) acts as the mediator species and first get oxidized to Co(III). This oxidized species when comes in contact with organic compound oxidizes the organic and getting reduced to Co(I). We have carried out the cyclic voltammetric investigations of Co(II) oxidation and mediated oxidation of benzene. The galvanostatic electrolysis carried out confirmed the catalyzing nature of Co(II) and the oxidation of benzene to benzoquinone.
( Kannan Karunakaran ),( Subramanian Balaji ),김정훈,이보열,문일식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Zeolites are complex alumino silicate molecules with specific porosity and pore size distribution. These unique properties make them to be used as molecular sieves in many industrial applications particularly in petrochemical industries. When precursor molecules for the synthesis of zeolites are coated over alumina tubes and subjected to controlled thermal heating, zeolites are formed by in situ growth over the alumina tubes. These tubular materials with coated zeolite materials act as tubular membranes and finds use in electrochemical tubular reactors as the separator. In the present investigation we have employed zeolite coated ceramic membranes for the metal ion oxidation in sulfuric acid medium. Here, we present the results on Cobalt(II) oxidation in sulfuric acid medium carried out under the various process parameters such ascurrent density of the electrodes, metal ion concentration and concentration of the acid electrolyte.
Kannan, R.,Kim, A.R.,Nahm, K.S.,Yoo, D.J. Pergamon Press ; Elsevier Science Ltd 2015 International journal of hydrogen energy Vol.40 No.35
In this study, low-loading palladium nanoparticles (Pd NPs) were prepared on a graphene oxide-manganese oxide (GR/MO) support using a one-pot, eco-friendly ''green'' process. The GR/MO-Pd nanocomposite was characterized by powder X-ray diffraction, Raman, scanning microscopy and transmission electron microscopy. The elemental composition was determined using energy dispersive X-ray spectroscopy, and the electronic state of the materials was characterized by X-ray photoelectron spectroscopy. The GR/MO-Pd nanocomposite exhibited high electrocatalytic activity towards ethylene glycol oxidation in alkaline medium. The GR/MO-Pd electrode demonstrated a forward anodic peak current density of 3.8 mA/cm<SUP>2</SUP>, which was higher than both MO-Pd and GR-Pd electrodes. This excellent catalytic activity, low onset potential, better intermediate tolerance and good long-term stability of the GR/MO-Pd electrode could be attributed to the uniform dispersion of Pd NPs over the GR/MO support. This work outlines a new method for simple, fast and eco-friendly fabrication of a catalyst with high electrochemical performance and potential in alcohol fuel cell applications.
( Kannan Karunakaran ),문일식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Chemical method synthesis in presence of surfactant helps to control the structure of the materials of interst due to capability to form different shapes with varying concentration above CMC value, hydrophobic corea and hydrophilic head of surfactant, which leads to formation of nano particles in defined morphology. On these basis, we have synthesized nano structured PbO2 from the mixture of PVP and Triton X-100 at room temperature. Different ratios of PVP and Triton X-100 were studied to get optimize condition to form defined PbO2. The prepared material was characterized by the XRD, SEM and TEM techniques. The Polymer doped PbO2 was subjected to study the elctrochmeical oxidation of Phenol by Cyclic Voltammtery technique.
( Kannan Karunakaran ),문일식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Besides stability factor of PbO2, its wider potential window can make it as anode in the electrochemical field. Alkali earthmetal oxides particulary BaO is used for Ammonia sensor. Syngeric of these two material Here in Ba.PbO2 electrode was electrochemically prepared on Ti substrate and utilized as NH3 sensor. At first, the electrodeposition was carried out at 65°C in 0.2 M H3BO3. Then, effect of current density and concentration of precursor of Barium and Lead were studied and optimized through cyclic voltammetry analysis. Further, the as prepared electrodes examined through SEM and XRD analyses. Finally, the prepared electrode was subjected to oxidize NH3, NH4Cl, and NH4CO3 through cyclic voltammetry technique in various pH solutions.