Interfacial Properties of Fluorocarbon and Hydrocarbon Phosphate Surfactants at the Water−CO2 Interface
| Autor: | Keith P. Johnston, Peter J. Rossky, Bin Xu, Vibha Srinivasan, Charles S. Johnson, Varun V. Dhanuka, Matthew T. Stone, P. Griffin Smith, Jasper L. Dickson, Jason S. Keiper, Joseph M. DeSimone, Jacqueline Behles |
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| Rok vydání: | 2005 |
| Předmět: |
chemistry.chemical_classification
Chemistry General Chemical Engineering Ionic bonding General Chemistry Branching (polymer chemistry) Industrial and Manufacturing Engineering Surface tension symbols.namesake Gibbs isotherm Adsorption Hydrocarbon Pulmonary surfactant Chemical engineering symbols Organic chemistry Fluorocarbon |
| Zdroj: | Industrial & Engineering Chemistry Research. 44:1370-1380 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie048999c |
| Popis: | With high-pressure pendant-drop tensiometry, the interfacial tension (γ) and surface excess (Γ∞) for a family of ionic surfactants with identical phosphate headgroups and varying fluorocarbon and hydrocarbon tail structures were examined at the water−CO2 interface. To compensate for the unusually weak CO2−surfactant tail interactions, we designed hydrocarbon tails with weak tail−tail interactions to achieve a more favorable hydrophilic−CO2-philic balance. Branching of hydrocarbon surfactant tails is shown to lead to more favorable adsorption at the interface, closer to that of fluorocarbon surfactants. γ for a double-tail hydrocarbon phosphate surfactant with a relatively high degree of tail branching was lowered from the water−CO2 binary interface value of about 20 mN/m at 25 °C and 340 bar to 3.7 mN/m. This reduction in γ is attributed to both a decrease in the free volume between tails at the interface and reduced tail−tail interactions. In addition to tail structure, the effects of surfactant counteri... |
| Databáze: | OpenAIRE |
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