THE BEHAVIOR OF MONOLAYERS OF PROGRESSIVELY FLUORINATED FATTY ACIDS ADSORBED ON WATER
Abstract
A study was made on the force-area, surface potential-area, and surface moment-area relations of monolayers of two series of progressively fluorinated fatty acids spread on water at various pH values. The series were n-heptadecanoic acids with substitutions in the 17-position of perfluoromethyl, perfluoropropyl, perfluoropentyl, and perfluoroheptyl groups, and n-undecanoic acids with substitutions in the 11-position of per fluoroheptyl, perfluorooctyl, and perfluorodecyl groups. In both series the stability of the monolayers at all pH values falls off rapidly with progressively shorter perfluoro segments. THE COMPRESSED FILMS OF ALL STABLE ACIDS ARE IN THE LIQUID-CONDENSED STATE, INDICATING LIMITING AREAS PER MOLECULE OF #> TO #* SQUARE ANGSTROMS. The change in surface potentials of all films is larger than those of any aliphatic acid and shows that the dipole is oriented in the opposite direction.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 21, 1963
- Accession Number
- AD0407266
Entities
People
- Marianne K. Bernett
- William A. Zisman
Organizations
- United States Naval Research Laboratory