Van der Waals Forces between Quartz and n-Heptane

1 June 1964

journal article
research article
Published by AIP Publishing in The Journal of Chemical Physics

Vol. 40 (11) , 3394-3396
https://doi.org/10.1063/1.1725012

Abstract

The room temperature adsorption isotherm of n‐heptane on an AT‐cut quartz crystal has been measured in the region of very high coverages (six to 15 monolayers). The isotherm in this region may be represented by the equation lnP=C+Δψ/kTd³, where Δψ/d³, is interpreted as the difference between the potential energy of a heptane molecule at a distance d from a quartz surface and that of a heptane molecule at the same distance from a liquid heptane surface. A value of Δψ/kT of 725 Å³ is obtained.

Keywords

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