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Electrochemical Polymerization of Ruthenium(II) Complex and Application to Acetaminophen Analysis
Sethuraman Kannan,Jung Ik Son,JeeEun Yang,심윤보 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.4
A novel ruthenium(II) complex, [RuC1_2(DMSO)_2(PhenTPy)] has been synthesized by the condensation of RuCl2_(DMSO)_4 with (1-(1,10-phenanthrolinyl)-2,5-di(2-thienyl)-1H-pyrrole)[PhenTPy] in CHCl_3 solution. The [RuC1_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 [RuC1_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 0.01mM in a phosphate buffer solution (pH 7.0).
Modified high-efficiency bidirectional DC-DC converter topology
Somalinga, Sethuraman S.,Santha, Karuppiah The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.1
A modified topology to obtain a high efficiency bidirectional type DC-DC converter without magnetic coupling is proposed in this paper. The modified circuit contains four switches with their body diodes, two inductors and a capacitor, and the topology arrangement uses two boost converters to develop the gain. The input current of the modified topology is divided between two different values of inductors, which results in high efficiency. In the buck mode, an obvious reduction in the voltage gain and an improved efficiency can be seen using synchronous rectification. The modified topology improves performance, allows for easy control structures and can be used in low output voltage high current battery charging applications. Simulations of the proposed system have been carried out through MATLAB/SIMULINK software. In addition, it has been validated through a 12 V/120 V, 40 W prototype circuit.
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).
Kunjithapatham Sethuraman,Palanisamy Kumar,Kannappan Santhakumar,Shizuyasu Ochiai,신백균 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.1
Fluorinated copper-phthalocyanine (F<sub>16</sub>CuPc) thin films were prepared by using a vacuum evaporation technique and were applied to <i>n</i>-type organic field-effect transistors (OFETs) as active channel layers combined with a spin-coated polycarbonate thin-film gate insulator. The output characteristics of the resulting <i>n</i>-type OFET devices with bottom-gate/bottom-contact structures were investigated to evaluate the performances such as the field effect mobility (<i>μ<sub>FE</sub></i>), the on/off current ratio (<i>I<sub>on/off</sub></i>), and the threshold voltage (<i>V<sub>th</sub></i>). A relatively high field effect mobility of 6.0 × 10<sup>−3</sup> cm<sup>2</sup>/Vs was obtained for the n-type semiconductor under atmospheric conditions with an on/off current ratio of 1 × 10<sup>4</sup> and a threshold voltage of 5 V. The electron mobility of the n-type semiconductor was found to depend strongly on the growth temperature of the F<sub>16</sub>CuPc thin films. X-ray diffraction profiles showed that the crystallinity and the orientation of the F<sub>16</sub>CuPc on a polycarbonate thin film were enhanced with increasing growth temperature. Atomic force microscopy studies revealed various surface morphologies of the active layer. The field effect mobility of the F<sub>16</sub>CuPc-OFET was closely related to the crystallinity and the orientation of the F<sub>16</sub>CuPc thin film.
The characterization of pseudo-shock wave in various ducts with constant area
PETHA SETHURAMAN Vignesh Ram,Heuy-DongKim 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10
In a supersonic intake, the flow decelerates from supersonic to subsonic speed occurs inside the isolator by a series of bifurcated compression waves and followed by an adverse pressure gradient region. This wave phenomenon is referred to as pseudo-shock wave (PSW). The length of the PSW is one of the main consents in designing the Isolator. The flow characteristic of PSW is depending on the several parameters which makes the difficulties in designing the Isolator for each particular engine. Also, the pseudo shock wave strongly affects the performance of the flow device. In the present work, the characterization of the pseudoshock wave is analyzed using computational fluid dynamics method in a constant area duct. The effect of back pressure on the shock structure and the influence of geometrical crosssectional area are studied. The results show the nature of pseudo-shock wave is strongly influenced by the blockage ratio. The large aspect ratio duct shows relatively less total pressure loss. An improved correlation is obtained between the pressure ratio and the length of shock train region in terms of boundary layer blockage ratio. The estimated length of the shock train is compared with present numerical and reference experimental results. The results show a good agreement on predicting the length of shock train.
Generation of graceful trees from arbitrary trees
G. Sethuraman,P. Ragukumar 장전수학회 2014 Advanced Studies in Contemporary Mathematics Vol.24 No.3
A function f is called graceful labeling of a graph G with m edges if f is an injective funtions from V(G) to (formula) such that when every edge ub is assigned the edge label (formula), then the resulting edge labels are distinct. A graph which admits graceful labeling is called a graceful graph. The popular graceful tree conjecture states that every tree is graceful. In spite of many significant results on graceful tree conjecture, it remains open over four decades. In this paper, we introduce a new method of consturcting graceful trees by an algorithm that will generate a graceful tree every given arbitrary tree