Pilgrim Trust Lecture, Molecular layers
10.1098/rspa.1939.0017
Crossref journal-article
The Royal Society
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences (175)
Abstract

If fragments of camphor are placed upon a clean water surface they move about vigorously and may even be made to propel toy boats. The late Lord Rayleigh (1890 a, 1890 c) found that these movements stopped rather abruptly if the surface tension of the water was lowered by 21 dynes/cm. by oily contamination of the surface. The amount of olive oil needed for this purpose was surprisingly small, corresponding to a thickness of only 16 A (16 x 10 -8 cm.). Miss Pockels (1891) proved that any amount of olive oil less than enough to give a critical thickness of about 10 A had no effect whatever on the surface tension of water, but above this limit the surface tension decreased rapidly as the amount of oil was increased. Only 5 g. of olive oil would be needed to cover an acre of water surface with a film of this critical thickness. Miss Pockels also showed that accidental contamination of the surface, which had previously complicated nearly all observations of surface-tension phenomena, could be eliminated by using a trough filled to the brim with water, and sweeping impurities off the surface by the motion of barriers which rested on the edges of the trough. This use of movable barriers to confine films, to compress them or to remove them from the surface, laid the foundation for nearly all the modern work with films on water. The early theories of surface tension had been developed by physicists (Thomas Young 1805; Laplace, Gauss, etc.) who either treated liquids as continuous fluids between whose elements of volume forces acted, or considered only spherical molecules which exerted upon one another forces that varied as a function of the distance between molecular centres. Such theories naturally could not take into account the wealth of knowledge that had been accumulated by organic chemists regarding the structures of organic molecules.

Bibliography

Pilgrim Trust Lecture, Molecular layers. (1939). Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 170(940), 1–39.

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Dates
Type When
Created 18 years, 8 months ago (Dec. 15, 2006, 2:56 p.m.)
Deposited 4 years, 6 months ago (Feb. 20, 2021, 8:47 p.m.)
Indexed 1 year, 6 months ago (Feb. 7, 2024, 2:09 p.m.)
Issued 86 years, 5 months ago (March 16, 1939)
Published 86 years, 5 months ago (March 16, 1939)
Published Online 28 years, 7 months ago (Jan. 1, 1997)
Published Print 86 years, 5 months ago (March 16, 1939)
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@article{1939, Molecular layers_1939, volume={170}, ISSN={2053-9169}, url={http://dx.doi.org/10.1098/rspa.1939.0017}, DOI={10.1098/rspa.1939.0017}, number={940}, journal={Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences}, publisher={The Royal Society}, year={1939}, month=mar, pages={1–39} }