Morphological and Interaction Characteristics of Surface-Active Ionic Liquids and Palmitic Acid in Mixed Monolayers
| Autor: | Khaleel I. Assaf, Ghada G. Kayed, Abdussalam K. Qaroush, Matthew F. Paige, Ala'a F. Eftaiha, Abdel Rahman K. Abdel Rahman |
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| Rok vydání: | 2020 |
| Předmět: |
Langmuir
Range (particle radiation) Materials science Relaxation (NMR) Analytical chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Langmuir–Blodgett film Atomic and Molecular Physics and Optics 0104 chemical sciences Palmitic acid chemistry.chemical_compound chemistry Ionic liquid Monolayer Brewster angle microscope Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Chemphyschem : a European journal of chemical physics and physical chemistry. 21(16) |
| ISSN: | 1439-7641 |
| Popis: | A series of water soluble, surface-active ionic liquids (SAILs), namely, 1-alkyl-3-methyl imidazolium chlorides ([Cn -mim]Cl) and their mixtures with palmitic acid (PA) are investigated in Langmuir monolayers and Langmuir-Blodgett films. It is inferred from the surface pressure-area isotherms that C16 -mim-IL mixes non-ideally with PA and stabilizes the binary mixed films. In addition, the residence of mim-IL at the water surface is enhanced as a function of the increasing alkyl side chain length. Generally, the compressional moduli values decrease upon increasing the content of the mim-ILs over a wide range of compositions. Furthermore, film relaxation measurements indicate that the IL component is selectively excluded from the mixed films upon achieving a certain target pressure. Brewster angle microscope images demonstrate minimal changes on the PA domains in the presence of either C4 - and C8 -mim-ILs, whereas presence of the hexadecyl counterpart results in the formation of condensed sheets. Atomic force microscopy imaging of deposited films show the formation of propeller-like aggregates when C8 - or C16 -mim-IL is present in the mixed films. |
| Databáze: | OpenAIRE |
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