Letter | Published:

Ice Nucleation by Metaldehyde

Naturevolume 199pages475476 (1963) | Download Citation



DURING recent years ice-nucleation by some organic substances has been investigated with increasing interest in fundamental, as well as in practical, fields. Some steroids can nucleate ice crystals at temperatures as high as − 1° C when prepared by thermal recrystallization1,2. One of the amino-acids3 is reported to nucleate ice at − 4.5° C. Although many of them have complicated molecular and crystal structures and are not common, they may be useful in understanding heterogeneous ice-nucleation. For application to cloud-seeding, phloro-glucinol4, α-phenazine5 and a few others have been found among the common organic compounds to overcome the faults of silver iodide as a practical seeding material, such as photolytic inactivation and high price. The wide variety of organic compounds gives some hope of finding improved cloud-seeding materials.

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    Head, R. B., Nature, 191, 1058 (1961).

  2. 2

    Fukuta, N., and Mason, B. J., J. Phys. Chem. Solids (in the press).

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    Power, B. A., and Power, R. F., Nature, 194, 1170 (1962).

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    Bashikirov, G. M., and Krasikov, P. N., Trudy Glavnoi Geofiz. Obs., 72, 118 (1957).

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    Head, R. B., Nature, 196, 736 (1962).

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    Mason, B. J., and Maybank, J., Quart. J. Roy. Met. Soc., 84, 235 (1958).

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    Pauling, L., and Carpenter, D. C., J. Amer. Chem. Soc., 58, 1274 (1936).

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  1. Radiophysics Laboratory, Commonwealth Scientific and Industrial Research Organization, Sydney

    • N. FUKUTA


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