Abstract
IN the course of a search for a suitable form in which particles of silver iodide can serve as nucleating agents of a supercooled cloud, Vonnegut tested1 an aqueous solution of silver iodide (200 gm. of silver iodide and 100 gm. of ammonium iodide in a mixture of 750 c.c. of acetone and 250 c.c. of water). It is reported by him that “solutions can be diluted any desired amount with acetone; dilution with water causes precipitation of AgI”. On the other hand, it was known2 that in experiments on artificially induced rain from supercooled clouds in Algeria, a colloidal aqueous suspension (1 1,000, 1/10,000 by weight) of silver iodide was used with success. Since no particulars of this colloidal aqueous suspension were available, it was decided to try to produce a colloidal suspension (a) as stable as possible, (b) one that can be diluted to any proportion with water.
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References
Project Cirrus, Gen. Electric (1948), p. 88.
Ducellier, G., Agria, 17, 223.
Project Cirrus, Gen. Electric (1948), p. 27 and p. 82.
Chem. Rev., 44, 291 (1949).
Nature, 163, 727 (1949).
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KATCHALSKY, E., NEUMANN, H. Preparation of Colloidal Silver-Iodide Water-Suspensions for Nucleation of Supercooled Clouds. Nature 165, 244–245 (1950). https://doi.org/10.1038/165244b0
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DOI: https://doi.org/10.1038/165244b0
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