Measurement of forces due to structure in hydrocarbon liquids

Christenson, H. K., Horn, R. G. and Israelachvili, J. N. 1982, Measurement of forces due to structure in hydrocarbon liquids, Journal of colloid and interface science, vol. 88, no. 1, pp. 79-88, doi: 10.1016/0021-9797(82)90156-4.

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Title Measurement of forces due to structure in hydrocarbon liquids
Author(s) Christenson, H. K.
Horn, R. G.
Israelachvili, J. N.
Journal name Journal of colloid and interface science
Volume number 88
Issue number 1
Start page 79
End page 88
Total pages 10
Publisher Academic Press
Place of publication Maryland Heights, Mo.
Publication date 1982-07
ISSN 0021-9797
Keyword(s) hydrocarbon liquids
mica sheets
molecular diameter of cyclohexane
Summary Direct measurements of the force between two molecularly smooth mica sheets immersed in cyclohexane show not a monotonic van der Waals attraction, but an oscillatory function of distance, where the spacing between successive minima corresponds to the molecular diameter of cyclohexane. As surface separation increases the oscillations become less pronounced, and beyond 5 nm (typically seven or eight oscillations) they are no longer detected. These results accord with theoretical ideas on structural forces resulting from the inhomogeneous arrangement of molecules of the liquid near the solid surface. In n-octane the force law does not show the same pronounced oscillations, except at very small separations where repulsive barriers are found. These are attributed to the difficulty of removing the last layers of adsorbed molecules of the liquid from the mica surfaces, and they reduce the mice-mica adhesion significantly. Small amounts of water in the hydrocarbon liquids condense to form a bridge between the surfaces at small separations, causing a very strong adhesion between them. Some implications of these results for the stability of colloids in organic media are discussed.
Language eng
DOI 10.1016/0021-9797(82)90156-4
Field of Research 029999 Physical Sciences not elsewhere classified
Socio Economic Objective 970102 Expanding Knowledge in the Physical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©1982, Academic Press
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