Accession Number:

AD0261016

Title:

THE ADSORPTION OF OIL-SOLUBLE SULFONATES AT THE METAL/OIL INTERFACE

Descriptive Note:

Interim rept.

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

Report Date:

1961-07-14

Pagination or Media Count:

12.0

Abstract:

IT HAS BEEN FOUND POSSIBLE TO ISOLATE ADSORBED FILMS OF THE SALTS OF DINONYLNAPHTHALENE SULFONIC ACID ON STAINLESS STEEL SURFACES BY RETRACTION FROM AROMATIC HYDROCARBON SOLUTION. The wetting behavior of various series of liquids on the resulting film-coated surfaces suggests that the molecules adsorb to give monomolecular films by attachment of the polar sulfonate heads to the metal oxide surface with the hydrocarbon tails outward. The molecules are sufficiently close packed to yield a surface having properties similar to those of polyethylene. A study of the wettability of the soap monolayers by a series of alkylnaphthalene liquid indicates that adsorption from water-saturated solution is independent of the soap cation and is the result of dipole interactions between the hydrated sulfonate ion pair with the metal oxide surface. Adsorption from anhydrous solution does depend upon the c oice of cation. Here dipole interactions between the unhydrated ion pair and the metal oxide surface appear to be supplemented by coordination of the cation with the oxygen of the oxide film. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE