Abstract
IN three previous notes in NATURE1 it has been pointed out that the diamagnetism of graphite, antimony, and bismuth decreases with particle size. This was most striking in graphite and less in antimony and bismuth. In a later communication on the same subject2 I adopted two methods of colloidalisation of bismuth—Bredig's method and mechanical colloidalisation. In Bredig's method I obtained an abnormally low value, due to the powder containing a mixture of oxide and the metal, as was pointed out by me. In the case of bismuth, S. S. Bhatnagar3 contends that he obtains a large amount of oxide by mechanically colloidalising bismuth, and part of the decrease of diamagnetism that I obtained by that method is also due to oxidation.
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References
Sir C. V. Raman, NATURE, 123, 945; 1929. V. I. Vaidhianathan, NATURE, 124, 762; 1929, and 125, 672; 1930.
Ind. Jour. Phys. 5, 559; 1930.
Ind. Chem. Soc. Jour. 7, 975; 1930.
NATURE, 127, 556; 1931.
NATURE, 126, 990; 1930.
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VAIDHIANATHAN, V., SINGH, B. Magnetism of Colloidal Gold. Nature 128, 302–303 (1931). https://doi.org/10.1038/128302b0
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DOI: https://doi.org/10.1038/128302b0
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