• S N Changdar

      Articles written in Pramana – Journal of Physics

    • Application of a radioactive tracer method for diffusion study in some liquids

      H Chakraborti S N Changdar

      More Details Abstract Fulltext PDF

      In this paper a radioactive tracer technique based on sliding cell method developed in our laboratory for the study of diffusion in liquids is presented in detail. This method consists of radioactive and non-radioactive liquid columns of equal length and the radiation detector is placed in a vertical geometry over the diffusion column. Some liquid metals and aqueous electrolyte solutions were studied by this method. The data of liquid metals like mercury and gallium have been analyzed from the point of view of hard sphere model and those of electrolyte solutions from phenomenological theories. Onsager’s coefficientsL11,L12,L22 have been calculated from the experimental data and the variation of diffusion with solute concentration has been explained from ion-ion interaction.

    • Measurement of diffusion coefficients of thallium ion in H2O and D2O systems at different concentrations

      A Das S N Changdar

      More Details Abstract Fulltext PDF

      Sliding cell method, developed in our laboratory, has been used to measure the inter diffusion coefficient of thallium ion in thallous sulphate solution over a wide concentration range using both water and heavy water as solvent at 35°C. The results have been analysed from the point of view of both ion-ion and ion-solvent interactions. The comparison of the diffusivities of the same ion in D2O and H2O electrolyte solutions at the same temperature indicate that the addition of salt affects the two solvents differently.

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