• S R Rajagopalan

      Articles written in Bulletin of Materials Science

    • Electrochemical experiments in space

      S R Rajagopalan

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      The probable effects of rarefied atmosphere and near-zero gravity conditions that prevail in space, in relation to electrochemical experiments, are briefly discussed. The various space electrophoresis experiments are reviewed and discussed. Some possible additional electrochemical experiments are suggested.

    • Chemical amplification — A novel approach to ultratrace analysis

      S R Rajagopalan

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      The lowest concentration that can be estimated with 100% error in chemical analysis by instrumental technique is referred to as detection limit. It is equal to the ratio of twice the background signal to the magnitude of analytical signal corresponding to a concentration of unity. Detection limit (dl) could be improved if the analytical signal alone could be selectively amplified without affecting the background. It is shown that this could be achieved by chemical amplification. Atomic amplification of two or three orders of magnitude could be obtained by combining two chemical amplifications in series. It is demonstrated that by using heteropoly acid formation as the first amplification reaction and determining molybdenum in the heteropoly acid by catalyticdc polarographic wave, a detection limit for the hetero atom of less than a ppb can be obtained. It is pointed out that the approach of selectively amplifying analytical signals by tandem chemical amplification reactions makes it possible to perform ultratrace analysis (ppb level) with classical instrumental analytical techniques which havedl at ppm level.

    • Materials research at national aeronautical laboratory (contributions of S Ramaseshan)

      S R Valluri S R Rajagopalan

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      Materials research programmes of the National Aeronautical Laboratory and Prof. Ramaseshan’s contributions to these are presented in this article.

    • Electrochemical preparation of potassium gold cyanide

      Indira Rajagopal S R Rajagopalan

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      The essential requirements for the industrial preparation of potassium gold cyanide (pgc) are: (a) high rate of dissolution and (b) smooth and uniform dissolution. Employing galvanostatic and potentiostatic polarisation data and observations on the surface topography of anodes dissolved by both the techniques, it is shown that potentiostatic dissolution of gold in potassium cyanide at +0·345 V satisfies the above requirements.

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