Jump to main content
US EPA
United States Environmental Protection Agency
Search
Search
Main menu
Environmental Topics
Laws & Regulations
About EPA
Health & Environmental Research Online (HERO)
Contact Us
Print
Feedback
Export to File
Search:
This record has one attached file:
Add More Files
Attach File(s):
Display Name for File*:
Save
Citation
Tags
HERO ID
3767041
Reference Type
Journal Article
Title
Mixed Langmuir monolayer of N-(1,1-dihydroperfluorododecyl)-N,N,N-trimethylammonium chloride with perfluorocarboxylic acids
Author(s)
Rusdi, M; Moroi, Y; Nakamura, S; Shibata, O; Abe, Y; Takahashi, T
Year
2001
Is Peer Reviewed?
Yes
Journal
Journal of Colloid and Interface Science
ISSN:
0021-9797
EISSN:
1095-7103
Publisher
Academic Press Inc.
Volume
243
Issue
2
Page Numbers
370-381
Language
English
DOI
10.1006/jcis.2001.7881
Web of Science Id
WOS:000172412200015
Abstract
Surface pressure (pi)-area (A), surface potential (DeltaV)-area (A), and dipole moment (mu (perpendicular to))-area (A) isotherms for N(1,1-dihydroperfluorododecyl)-N,N,N-trimethylammonium chloride (C12-TAC) and perfluorododecanoic acid (FC12) on the substrate of 0.01 M sodium chloride at pH 2.0 were investigated at the air-water interface by the Langmuir method and the ionizing electrode method. The temperature dependence of the transition pressure of each component was not larger than that of normal hydrogenated surfactant. The apparent molar entropy, enthalpy, and internal energy changes of phase transition from the disordered to the ordered state were calculated. Surface potentials (AV) were analyzed using the three-layer model proposed by R. J. Demchak and T. Fort (J. Colloid Interface Sci. 46, 191-202, 1974) for FC12 and Gouy-Chapman treatment for C12-TAC. The contributions of the omega -CF3 group and the head group of the vertical component to the dipole moment, mu (perpendicular to), were estimated. The new finding was that the pi -A curves are shifted to an area smaller than a molecular area of two pure components for the mole fraction (x) of perfluorododecanoic acid of x greater than or equal to0.3. The molecular areas negatively deviate from the additivity rule at discrete surface pressures. Assuming a regular surface mixture, the Joos equation (Joos, P, and R. A. Demel, Biochim. Biophys. Acta 183, 447, 1969) for analysis of the collapse pressure of mixed monolayer allowed estimation of the interaction parameter; xi = -4.20 at x less than or equal to0.5 and xi = -0.24 at x>0.5 between two fluorinated amphiphiles. (C) 2001 Academic Press.
Keywords
Langmuir monolayers; fluorinated surfactants; surface potentials; dipole moments; two-dimensional phase diagram; pi-A isotherm; Delta V-A isotherm
Tags
PFAS
•
Expanded PFAS SEM (formerly PFAS 430)
Perfluorododecanoic acid
•
^Per- and Polyfluoroalkyl Substances (PFAS)
PFDoA (307-55-1)
Literature Search
WOS
•
PFAS Universe
Data Source
Web of Science
Perfluorododecanoic acid
•
PFDA
Scopus: April 2021
Home
Learn about HERO
Using HERO
Search HERO
Projects in HERO
Risk Assessment
Transparency & Integrity