Journal article
Mixing of Partially Fluorinated Carboxylic Acids and Their Hydrocarbon Analogues with Dipalmitoylphosphatidylcholine at the Air−Water Interface
Langmuir, Vol.16(26), pp.10161-10166
12/26/2000
DOI: 10.1021/la991598v
Abstract
The interaction of partially fluorinated carboxylic acids with a biologically relevant surfactant, dipalmitoylphosphatidylcholine (DPPC), was investigated at the air−water interface. The compression isotherms of mixtures of three partially fluorinated carboxylic acids (1−3) and their hydrocarbon analogues (4 − 6) with DPPC were recorded at various compositions on hydrochloric acid (pH = 1.9, 32 ± 2 °C) as a subphase. The mixing behavior was assessed by analyzing the concentration dependence of the average molecular area at constant film pressure (area/mole fraction or A − X diagram). All six carboxylic acids (1 − 6) show a negative deviation from ideal behavior at surface pressures between 3 and 25 mN/m, which is indicative of an attractive interaction with DPPC in the mixed monolayer at the air−water interface. With the exception of nonafluorpentadecanoic acid (1), all carboxylic acids investigated show a concentration dependence of the breakpoint of the phase transition from the liquid-expanded to the liquid-condensed state, which supports the interpretation of the A − X diagrams.
Details
- Title: Subtitle
- Mixing of Partially Fluorinated Carboxylic Acids and Their Hydrocarbon Analogues with Dipalmitoylphosphatidylcholine at the Air−Water Interface
- Creators
- Hans-Joachim LehmlerMichael JayPaul M Bummer
- Resource Type
- Journal article
- Publication Details
- Langmuir, Vol.16(26), pp.10161-10166
- DOI
- 10.1021/la991598v
- ISSN
- 0743-7463
- eISSN
- 1520-5827
- Publisher
- American Chemical Society
- Language
- English
- Date published
- 12/26/2000
- Academic Unit
- Occupational and Environmental Health; Iowa Neuroscience Institute
- Record Identifier
- 9984001078202771
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