Abstract
GILLE1 has described the formation of a thick gel by saturating ethylene glycol with gypsum, CaSO4.2H2O, at 19° C., filtering carefully, and heating the solution to 40° C., at which temperature, owing to its decreased solubility, the calcium sulphate precipitates, but in the form of a gel. Gypsum has a structure2 in which layers of water molecules alternate with CaSO4 layers, and Gille suggests that the last-mentioned layers are preserved in the gel, but with ethylene glycol substituted for the water, and causing an indefinite expansion.
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References
Gille, F., Koll.-Z., 126, 154 (1952).
Wooster, W. A., Z. Krist., A, 94, 375 (1936).
MacEwan, D. M. C., Bull. 169, Calif. Div. of Mines, p. 78.
“X-Ray Diffraction by Polycrystalline Materials”, Chap. 5, p. 145 (Inst. Phys., London, 1955).
Beevers, C. A., and Raistrick, B., Nature, 173, 542 (1954).
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RUÍ;Z, J., MACEWAN, D. Nature of Calcium Sulphate Gels in Ethylene Glycol. Nature 176, 1169 (1955). https://doi.org/10.1038/1761169a0
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DOI: https://doi.org/10.1038/1761169a0
