Mixing Behavior in Binary Anionic Gemini Surfactant-Perfluorinated Fatty Acid Langmuir Monolayers
| Autor: | Wei Bu, David Sowah-Kuma, Amy L. Stevens, Jeveria Rehman, Matthew F. Paige |
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| Rok vydání: | 2017 |
| Předmět: |
Langmuir
Chemistry Ethylenediamine 02 engineering and technology Surfaces and Interfaces 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Mole fraction 01 natural sciences Miscibility 0104 chemical sciences Amorphous solid Crystallinity chemistry.chemical_compound Crystallography Pulmonary surfactant Monolayer Electrochemistry Organic chemistry General Materials Science 0210 nano-technology Spectroscopy |
| Zdroj: | Langmuir : the ACS journal of surfaces and colloids. 33(39) |
| ISSN: | 1520-5827 |
| Popis: | The miscibility and film structure of mixed Langmuir monolayer films composed of an anionic gemini N,N,N′,N′-dialkyl-N,N′-diacetate ethylenediamine surfactant (Ace(12)-2-Ace(12)) with perfluorotetradecanoic acid (C13F27COOH; PF) have been investigated using a variety of thermodynamic and structural characterization methods. The two film components were found to be miscible in monolayers at the air–water interface over a range of compositions and at all but the lowest surface pressures, with attractive interactions occurring between the two components. While pure PF monolayers formed crystalline lattices with hexagonal symmetry and with the surfactant tails oriented normal to the underlying water subphase, the pure gemini surfactant formed amorphous films with little tendency to orient at the subphase. In mixed films with mole ratios of PF:Ace(12)-2-Ace(12) < 2.5, the miscibility of the two components resulted in a nearly complete loss of crystallinity of the PF, though films at higher mole fractions of PF... |
| Databáze: | OpenAIRE |
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