Abstract

Interference microscopy has been used to measure contact angles in aqueous/organic/graphite systems. For contact angles < 15° this technique is of high precision. The solid substrate, highly oriented pyrolytic graphite (HOPG), was prepared for contact-angle measurements by cleaving under various media and by high-temperature outgassing. Differences in the measured contact angles depending on the surface pretreatment are reported. For the system n-heptane/water/HOPG in which the liquids were outgassed and the graphite cleaved under heptane the mean receding contact angle was 7.25 ± 1°. A similar result is obtained by high-temperature outgassing of the solid. Preliminary experiments show that n-decane and n-undecane show finite (though smaller) contact angles, while n-hexadecane, n-octanol, benzene and toluene displace water from the surface, which is then completely wetted by the organic phase.The overall mean receding contact angle for the heptane system is 7.25 ± 1.5°.

Keywords

Contact angleWettingGraphiteHeptaneHighly oriented pyrolytic graphiteDecaneOutgassingUndecaneHexadecaneTetradecaneTolueneAnalytical Chemistry (journal)Pyrolytic carbonMaterials scienceChemistryChromatographyComposite materialOrganic chemistryPyrolysis

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Publication Info

Year
1983
Type
article
Volume
79
Issue
11
Pages
2723-2723
Citations
11
Access
Closed

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I. C. Callaghan, D. H. Everett, Alistair Fletcher (1983). Liquid/liquid/solid contact angles measured by interference microscopy. Journal of the Chemical Society Faraday Transactions 1 Physical Chemistry in Condensed Phases , 79 (11) , 2723-2723. https://doi.org/10.1039/f19837902723

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DOI
10.1039/f19837902723