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Matheswaran, Manickam,Balaji, Subramanian,Chung, Sang-Joon,Moon, Il-Shik Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.8
The electrochemical oxidation of cerium(III) was carried out using divided and undivided electrochemical cells in nitric acid medium. It was found that divided cell with Nafion 324 as the separator gave good conversion yield with high current efficiency compared to the undivided cell. The efficiency of the divided electrochemical cell was further optimized in terms of cell voltage, temperature, flow rate of solution recirculation, concentrations of Ce(III) and nitric acid. The better conditions for 1 M Ce(III) in 3 M nitric acid were found to be 2.5 V, 363 K and 100 mL/min recirculation flow rate based on the current efficiency under the experimental conditions investigated. The Ce(IV) oxidant produced was used as a mediator for the mineralization of phenol. The mineralization efficiency of the cerium mediated electrochemical oxidation was found rapid and higher compared to the direct electrochemical oxidation based on CO2 evolution under the same conditions.
Evidence for Phase Change Memory Behavior in In2(SexTe1-x)3 Thin Films
P. Matheswaran,R. Sathyamoorthy,K. Asokan 대한금속·재료학회 2012 ELECTRONIC MATERIALS LETTERS Vol.8 No.4
Crystalline In2(Se0.5Te0.5)3 thin films are prepared by thermal evaporation and subsequently annealed at 300°C in Ar atmosphere. SEM image of the crystalline sample shows spherical nature of constituents, distributed uniformly throughout the surface. Island structure of the surface is clearly visible after switching. Elemental composition of the sample remains unchanged even after switching. Temperature dependent I-V analysis shows stoichiometric phase change at 80°C [from In2(Se0.5Te0.5)3 to In2Te3 and In2Se3 phase], where current switches three orders of magnitude higher than that in lower temperature. Further rise in temperature results increase in current only after switching, where threshold voltage remains constant.
Manickam Matheswaran,Subramanian Balaji,Sang Joon Chung,문일식 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.8
The electrochemical oxidation of cerium(III) was carried out using divided and undivided electrochemical cells in nitric acid medium. It was found that divided cell with Nafion 324 as the separator gave good conversion yield with high current efficiency compared to the undivided cell. The efficiency of the divided electrochemical cell was further optimized in terms of cell voltage, temperature, flow rate of solution recirculation, concentrations of Ce(III) and nitric acid. The better conditions for 1 M Ce(III) in 3 M nitric acid were found to be 2.5 V, 363 K and 100 mL/min recirculation flow rate based on the current efficiency under the experimental conditions investigated. The Ce(IV) oxidant produced was used as a mediator for the mineralization of phenol. The mineralization efficiency of the cerium mediated electrochemical oxidation was found rapid and higher compared to the direct electrochemical oxidation based on CO2 evolution under the same conditions.
Schottky Nature of InSe/Cu Thin Film Diode Prepared by Sequential Thermal Evaporation
P. Matheswaran,R. Sathyamoorthy,K. Asokan 대한금속·재료학회 2012 ELECTRONIC MATERIALS LETTERS Vol.8 No.6
Highly oriented indium selenide (InSe) thin films were prepared by sequential thermal evaporation on tungsten (W) substrate and subsequently annealed at 300°C for 30 min in argon (Ar) atmosphere. The films were characterized by Glancing Incidence x-ray diffraction (GI-XRD), scanning electron microscopy (SEM), Energy dispersive x-ray analysis (EDX), Diffused reflectance spectroscopy (DRS) and current-voltage (I-V) measurements. Highly crystalline InSe thin film was obtained after annealing and confirmed by XRD analysis. Band gap energy of the InSe system is deduced from the DRS measurements and found to be 1.3 eV. SEM analysis revealed that selenium (Se) content plays an important role in determining the surface morphology of the film. InSe thin film diode structure was fabricated as W/InSe/Cu system. The estimated values of barrier height for the film of thickness 3000 Å and 7000 Å are 0.65 eV and 0.61 eV respectively. Thickness dependent schottky nature of the InSe/Cu thin film diode is discussed in detail.
Manickam Matheswaran,문일식 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.3
The ozonation of phenol wastewater treatment system has been investigated with effective mass transfer between gas and liquid phase in a bubble column reactor. The designed bubble column reactor was investigated for increasing the rate of mass transfer of ozone, the rate of oxidation of phenol in the solution, the solubility and decomposition rate of ozone in the distilled water were also studied at different flow rates. The decomposition rate constants were calculated based on pseudo first order kinetics. The oxidation of phenol was investigated in order to provide the overall reaction rate constant for the reaction between ozone and phenol at 25℃. The influence of the operating parameters like initial phenol concentration, ozone flow rate and pH for the destruction of phenol by ozonation were studied. The pseudo first order rate constant was depending on the initial concentration of phenol solution. A comparison of TOC removal percentage between bubble column reactor and bubble diffuser using ozonation were reported.
문일식,Manickam Matheswaran,Subramanian Balaji,Vasily V. Kokovkin,Sang Joon Chung 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.5
operation units for the successful working mediated electrochemical oxidation (MEO) proces. In this study, elec-trochemical cells with DSA electrodes of two types, single stack and double stack connected in series, were used. Theperformances towards the electrochemical generation of Ce(IV) in nitric acid media at 80oC were studied. The cur-rent-voltage curves and cerium electrolysis kinetics showed the dependence on number of cell stacks needed to be con-nected in series for the destruction of a given quantity of organic pollutant. The presence of an optimum region forCe(III) oxidation with a contribution of oxygen evolution, especially at low Ce(III) concentration (high conversiontor processes were fited in a simple model proposed and used to calculate the curent needed in terms of Ce(III) oxi-dation rate and the number of cel stacks required for maintaining Ce(IV)/Ce(III) ratio at the same level during the organicdestruction. This consideration was based on the kinetic model previously developed by us for the organic destructionin the MEO proces.