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Titolo:
Behavior of partially fluorinated carboxylic acids at the air-water interface
Autore:
Lehmler, HJ; Oyewumi, MO; Jay, M; Bummer, PM;
Indirizzi:
Univ Kentucky, Med Ctr, Grad Ctr Toxicol, Lexington, KY 40536 USA Univ Kentucky Lexington KY USA 40536 Ctr Toxicol, Lexington, KY 40536 USA Univ Kentucky, Coll Pharm, Lexington, KY 40536 USA Univ Kentucky Lexington KY USA 40536 Coll Pharm, Lexington, KY 40536 USA
Titolo Testata:
JOURNAL OF FLUORINE CHEMISTRY
fascicolo: 1, volume: 107, anno: 2001,
pagine: 141 - 146
SICI:
0022-1139(200101)107:1<141:BOPFCA>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
SURFACTANTS; FLUOROCARBON; MONOLAYERS; AMPHIPHILE; LIPOSOMES; CLUSTERS;
Keywords:
Langmuir isotherms; DSC; fluorinated; perfluorinated; carboxylic acid;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Lehmler, HJ Univ Kentucky, Med Ctr, Grad Ctr Toxicol, 3-6 HSRB, Lexington,KY 40536 USA Univ Kentucky 3-6 HSRB Lexington KY USA 40536 on, KY 40536 USA
Citazione:
H.J. Lehmler et al., "Behavior of partially fluorinated carboxylic acids at the air-water interface", J FLUORINE, 107(1), 2001, pp. 141-146

Abstract

Langmuir isotherms were recorded for 1-(perfluorobutyl)undecanoic acid (F3C(CF2)(3)(CH2)(10)CO2H), 1-(perfluorohexyl)undecanoic acid (F3C(CF2)(5)(CH2)(10)CO2H) and 1-(perfluorooctyl)undecanoic acid (F3C(CF2)(7)(CH2)(10)CO2H). their hydrocarbon analog, perfluorododecanoic and perfluorotetradecanoic acid after spreading onto hydrochloric acid (pH = 1.9-2.0) at 32 degreesC. All acids formed stable monolayers at the air-water interface, 1-(Perfluorobutyl)undecanoic acid shows some similarity to the compression isotherm of tetradecanoic acid while lacking the phase transition of pentadecanoic acid. The isotherm for 1-(perfluorohexyl)undecanoic acid shows a temperature -dependent phase transition similar to the liquid expanded-liquid condensed transition of pentadecanoic acid. The pi -A isotherm of 1-(perfluorooctyl)undecanoic acid resembles the highly condensed monolayers of hepta- and nonadecanoic acid. Thus, the partially fluorinated acids seem to exhibit isotherm characteristics similar to hydrocarbon acids with shorter chain lengths. The three partially fluorinated acids have a higher limiting area compared to hydrocarbon and perfluorocarbon acids, which may be atributed to the strong dipole moment of the -CF2-CH2- linkage. Within this series of partiallyfluorinated carboxylic acids. the limiting area decreases with chain lengthening and a higher degree of fluorination. The collapse pressures of the fluorinated acids are smaller compared to their respective hydrocarbon analog. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 06:50:52