Accession Number:

AD0265220

Title:

THE EFFECT OF POLAR-NONPOLAR SOLUTES ON THE WATER WETTABILITY OF SOLID SURFACES SUBMERGED IN OIL

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

Report Date:

1961-09-01

Pagination or Media Count:

15.0

Abstract:

A study has been made of the effect of polarnonpolar solutes on the contact angles exhibited by water drops on polytetrafluoroethylene, polyethylene, and stainless steel surfaces submerged in decane, isopropylbiphenyl, and bis2ethylhexyl sebacate. The solutes investigated included the oil-soluble metal salts of dinonylnaphthalene sulfonate and a water-soluble amphipath, sodium dodecylsulfate. A parabolic relation was found between the cosine of the contact angle, and the oilwater interfacial tension, and this was shown to be consistent with the Young-Dupre equation which gives the relation between the angle and the three interfacial energies that act at the oilwatersolid line of intersection. The experimental data also provide a measure of the work required to displace water from the submerged surfaces. It was found that the work required to displace water from the surface of polytetrafluoroethylene was generally greater than the work necessary to displace water from the surface of polyethylene. This was a result of the polytetrafluoroethylene having a greater interfacial energy against the oils than does polyethylene. An analytic treatment of the data was developed which gave a numerical indication of the various oilpolymer interfacial energies. This treatment also suggested that the polar-nonpolar solutes were adsorbed at both the waterpolymer and oilwater interfaces. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE