T N Misra
Articles written in Journal of Chemical Sciences
Volume 88 Issue 1 February 1979 pp 25-32 Physical and Theoritical
The change in semiconductive properties of vitamin A (alcohol and acetate) after adsorption of various vapours on its crystallite surface has been studied at a constant sample temperature. A rapid enhancement in the semi-conductivity has been observed. The rise in conductivity has been found to be exponential with increasing vapour pressure of the adsorbed gas. It has been suggested that charge transfer (CT) interaction may be responsible for such conductivity change. The adsorption process being efficiently reversible this CT complex is weakly bound.
The biological implication of these observations is discussed.
Volume 90 Issue 1 January 1981 pp 27-33 Physical and Theoretical
Adsorption and desorption of
Volume 90 Issue 2 April 1981 pp 105-116 Physical and Theoretical
On adsorption of various vapours, the electrical conductivity of nitroaromatic semiconductors 9-nitroanthracene, 1,4-dinitronaphthalene and 1,3,5-trinitrobenzene changes appreciably. This phenomenon has been used as a probe to study the adsorption and desorption processes in these nitroaromatic polycrystals. The adsorption and desorption kinetics have been found to follow the modified Roginsky-Zeldovich relation. Two adsorption processes have been identified. One, a two-stage process, the first of which gives a Lennard-Jones potential energy curve and is followed by a rate-determining transition over a potential energy barrier to the second stage of adsorption forming weakly bound complexes between the vapour molecules and the nitroaromatic crystallites. In the second process, in addition to the two stages of the first process, a third stage with a comparatively deep potential energy surface is reached by activation over a second potential barrier and strongly bound complexes are finally formed.
Volume 93 Issue 2 March 1984 pp 99-104 Physical and Theoretical
The semiconductive properties of a series of pyrenyl polyenes of the type R-(CH=CH)n-R, are studied as a function of the adsorption of different amount of a vapour. With regard to the compensation temperature (
Volume 96 Issue 1-2 January 1986 pp 85-89 Physical and Theoretical
Dark and photoconductivities in methylbixin have been studied as a function of applied field and temperature. The results suggest that a single discrete trapping level is involved in charge carrier generation and the dominant trapping level is different for dark and photoconduction. Space charge limited current theory has been used to evaluate various transport parameters. The effective drift mobility is shown to be field dependent.
Volume 100 Issue 4 August 1988 pp 337-344 Physical and Theoretical
The solid state photodimerization reaction of
Volume 100 Issue 5 October 1988 pp 433-439 Physical and Theoretical
Using electrical conductivity as a probe, the effect of crystal temperature on the process of adsorption and desorption of some chemical vapours on retinoic acid semiconductor has been investigated. It has been observed that a three-stage adsorption process in a sample at low temperature changes over to a two-stage process at higher temperature. Measures of activation energies of adsorption and desorption at different stages have been estimated from kinetic data analysis by using a modified Roginsky-Zeldovich equation.
Volume 101 Issue 4 August 1989 pp 343-349 Physical and Theoretical
The semiconduction activation energies of the nucleic acid bases adenine, guanine, thymine and uracil complexes with proflavine dye at various dye concentrations are measured in both the ohmic and the space-charge-limited (SCL) regions. The complexes are found to be nonextrinsic at high dye concentration but approach the extrinsic situation as the dye concentration decreases. From the SCL data analysis various transport parameters are evaluated.
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