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Science 7 May 1976:
Vol. 192. no. 4239, pp. 553 - 555
DOI: 10.1126/science.192.4239.553
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Articles

Fly Ash Collected from Electrostatic Precipitators: Microcrystalline Structures and the Mystery of the Spheres

G. L. FISHER 1, D. P. Y. CHANG 2, and MARGARET BRUMMER 3

1 Radiobiology Laboratory, University of California, Davis 95616
2 Department of Civil Engineering, University of California, Davis
3 California Primate Research Center, University of California, Davis

Scanning electron micrographs demonstrate the presence of microcrystalline structures on the surface of coal-derived fly ash samples taken from electrostatic precipitator hoppers. Cenospheres (hollow spheres) were found to be packed with smaller cenospheres, which were also packed with spheres. Microspheres, apparently formed by uneven heating, are encapsulated in the parent sphere. Chemical analyses provide a basis for the postulation of a mechanism of formation for plerospheres (hollow spheres packed with spheres) and microcrystals.

Submitted on October 20, 1975
Revised on December 16, 1975


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