Letter | Published:

Magnetism of Colloidal Gold

Nature volume 128, pages 302303 (22 August 1931) | Download Citation

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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

  1. 1.

    , NATURE, 123, 945; 1929. , NATURE, 124, 762; 1929, and 125, 672; 1930.

  2. 2.

    Ind. Jour. Phys. 5, 559; 1930.

  3. 3.

    Ind. Chem. Soc. Jour. 7, 975; 1930.

  4. 4.

    NATURE, 127, 556; 1931.

  5. 5.

    NATURE, 126, 990; 1930.

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Author information

Affiliations

  1. Dept. of Physics, F.C. College, Lahore, June 29.

    • V. I. VAIDHIANATHAN
    •  & BALWANT SINGH

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DOI

https://doi.org/10.1038/128302b0

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