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141.
Sanjiv Kumar J. V. Ramana V. S. Raju J. Arunachalam S. Gangadharan 《Fresenius' Journal of Analytical Chemistry》1992,343(12):879-880
Summary The stoichiometry of cadmium telluride has been determined by the non-destructive technique of XPS. The determination has been based on differential photoionisation cross-sections, electron mean free paths and areas due to M5 electrons of Cd and Te. The stoichiometry of Cd and Te determined by XPS has been found to be in good agreement with that obtained by analysing Cd and Te independently by chemical methods. 相似文献
142.
143.
Primary flow of a dusty, viscous, incompressible fluid due to the torsional vibrations of a circular disc is considered. Integral solutions for the velocity fields of the fluid and dust particles are given and the expression for the torque found. The effect of the presence of dust particles is discussed and limiting cases deduced. 相似文献
144.
Kinetics and mechanism of (salen)MnIII–catalysed hydrogen peroxide oxidation of alkyl aryl sulphides
Arunachalam Chellamani Nainamohamed Ismail Alhaji Seenivasan Rajagopal 《Journal of Physical Organic Chemistry》2007,20(4):255-263
The kinetics of (salen)MnIII complexes catalysed oxidation of aryl methyl and alkyl phenyl sulphides with hydrogen peroxide have been investigated at 25°C in 80% acetonitrile – 20% water spectrophotometrically. The reaction follows first‐order kinetics in (salen)MnIII complex and zero‐order kinetics in hydrogen peroxide. The order of the reaction with respect to sulphide is fractional and saturation in reaction rate occurs at higher sulphide concentrations. The pseudo first‐order rate constants have been analysed as per Michaelis–Menten kinetics to obtain the values of k2, the oxidant‐substrate complex decomposition rate constant, and K, the oxidant‐substrate complex formation constant. The effects of nitrogenous bases, free radical inhibitor and changes in solvent composition have also been studied. A suitable mechanism, supported by electronic‐oxidant and electronic‐substrate effect studies, involving a manganese(III)‐hydroperoxide complex as reactive species has been proposed. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
145.
N. Arunachalam A. John Peter Chang Woo Lee 《Physica E: Low-dimensional Systems and Nanostructures》2011,44(1):222-228
Pressure induced binding energy of a hydrogenic impurity in an InAs/GaAs quantum wire is investigated. Calculations are performed using Bessel functions as an orthonormal basis within a single band effective mass approximation using variational method. Photoionization cross-section of the hydrogenic impurity in the influence of pressure is studied. The total optical absorption and the refractive index changes as a function of normalized photon energy between the ground and the first excited state in the presence of pressure are analyzed. The optical absorption coefficients and the refractive index changes strongly depend on the incident optical intensity and pressure. The occurred blue shift of the resonant peak due to the pressure gives the information about the variation of two energy levels in the quantum well wire. The optical absorption coefficients and the refractive index changes are strongly dependent on the incident optical intensity and the pressure. 相似文献
146.
A surfactant–cobalt(III) complex, cis-[Co(en)2(4AMP)(DA)](ClO4)3, (en = ethylenediamine, 4AMP = 4-aminopyridine, DA = dodecylamine), was synthesized and characterized by physicochemical and spectroscopic methods. The critical micelle concentration (CMC) value of this surfactant–cobalt(III) complex in aqueous solution was obtained from conductance measurements. Conductivity data were used for evaluation of the temperature-dependent CMC and the thermodynamics of micellization ( $ \Updelta {\text{G}}_{\text{m}}^{ 0} $ Δ G m 0 , $ \Updelta {\text{H}}_{\text{m}}^{0} $ Δ H m 0 , and $ \Updelta {\text{S}}_{\text{m}}^{0} $ Δ S m 0 ). The kinetics of reduction of this surfactant–cobalt(III) complex by ion(II) in micelles, β-cyclodextrin (β-CD), and ionic liquid (IL) were studied. The reaction was found to be second order, and the electron transfer is postulated as outer sphere. The second-order rate constant for the electron transfer reaction was found to increase with increasing concentration of IL, but inclusion of the long aliphatic chain of the surfactant complex into β-CD decreases the rate of the reaction. The results have been interpreted in terms of the amphiphilicity of the surfactant complex. 相似文献
147.