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- Author or Editor: B. Viswanathan x
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Abstract
The characteristics of uncatalyzed bromate oscillator are altered in presence of 
-irradiation. These alterations could not be accounted for in terms of substrates acting as scavengers for hydrogen atoms. The alteration of the effective activity of the 
key species
in presence of -irradiation can also account for the changes observed in the oscillation characteristics.
Abstract
The effect of60Co 
-radiation on La2CuO4 solid catalyst prepared by the ceramic method has been studied. Gamma irradiation of La2CuO4 samples has been found to increase the Cu+ content, electrical conductivities and decrease the magnetic susceptibilities of the catalyst. The results have been interpreted on the basis of the crystal field model of the structure of La2CuO4.
Abstract
The catalytic activity of La2CuO4 for the decomposition of H2O2 was studied in detail. La2CuO4 was prepared by the ceramic method in four different ways. Gamma irradiation of the La2CuO4 samples increased their catalytic activity irrespective of the method of preparation. The enhanced catalytic activity is attributed to irradiation generated Cu+ centres on the surface of the catalyst.
The thermal decomposition of hydrated iron(II) oxalate and manganese(II) oxalate under high vacuum conditions (∼10−5 mm Hg) has been studied by differential thermal analysis. The decomposition in vacuum of iron(II) oxalate is exothermic, while that of manganese(II) oxalate is endothermic. An explanation is offered for this behaviour.
Abstract
Hydrogenation of various nitroarenes by a polymer-supported palladium-imidazole complex at ambient conditions was investigated. The effect of various substituents upon the rate of hydrogenation of nitrobenzene was studied. The rate of para-substituted nitrobenzene hydrogenation was related to the corresponding Hammett substituent constant. The kinetics of hydrogenation and the reusability of the catalyst were also studied.
Abstract
The oscillatory characteristics of a catalyzed bromate system is altered by gammairradiation. The alterations observed are probably due to the activation of the reduced form of the metal ion catalyst under gamma-irradiation. However, these alterations could not be accounted for in terms of an effective concentration of bromate acting as a quenching agent under gamma-irradiation conditions as reported in the literature.
Abstract
High-Tc superconductor YBa2Cu3O7 was irradiated by thermal neutrons. Significant effects on the critical temperature were found. The changes were also investigated by X-ray diffraction technique.65Cu (n, 
)66Cu was the only reason for the degradation in superconducting properties. The existence of an isotope effect is argued.
