Journal article
Mixing of Partially Fluorinated Carboxylic Acids with Their Hydrocarbon Analogs at the Air–Water Interface
Journal of colloid and interface science, Vol.249(2), pp.381-387
05/15/2002
DOI: 10.1006/jcis.2002.8282
PMID: 16290612
Abstract
The mixing behavior of 1-(perfluorobutyl)undecanoic acid–pentadecanoic acid (C15), 1-(perfluorohexyl)undecanoic acid–heptadecanoic acid (C17), and 1-(perfluorooctyl) undecanoic acid–nonadecanoic acid (C19) mixtures was investigated at the air–water interface. The compression isotherms of the fluorocarbon acid–hydrocarbon acid mixtures were recorded at various compositions on hydrochloric acid (pH 1.9, 37±2°C) as a subphase. The phase transition, limiting molecular area, area at collapse pressure, and collapse pressure were determined for all π–A isotherms. 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) and the concentration dependence of the phase transition, where possible. All three acid mixtures show a negative deviation from ideal behavior at surface pressures between 5 and 20 mN/m, which is indicative of an attractive interaction of both compounds in the mixed monolayer at the air–water interface. The miscibility apparently decreases with increasing chain length of the carboxylic acids (C15>C17>C19).
Details
- Title: Subtitle
- Mixing of Partially Fluorinated Carboxylic Acids with Their Hydrocarbon Analogs at the Air–Water Interface
- Creators
- Hans-Joachim Lehmler - Graduate Center for Toxicology, University of Kentucky, Lexington, Kentucky, 40536Paul M Bummer - College of Pharmacy, University of Kentucky, Lexington, Kentucky, 40536
- Resource Type
- Journal article
- Publication Details
- Journal of colloid and interface science, Vol.249(2), pp.381-387
- DOI
- 10.1006/jcis.2002.8282
- PMID
- 16290612
- NLM abbreviation
- J Colloid Interface Sci
- ISSN
- 0021-9797
- eISSN
- 1095-7103
- Publisher
- Elsevier Inc
- Language
- English
- Date published
- 05/15/2002
- Academic Unit
- Occupational and Environmental Health; Iowa Neuroscience Institute
- Record Identifier
- 9984001081302771
Metrics
13 Record Views