Adsorption of Pluronic Surfactants in Alkylene Carbonates on Silica
Adsorption of triblock Pluronic surfactants bearing poly(ethylene oxide) (PEO) chains of different lengths, L-62 (5 EO groups on each end), L-64 (13 EO groups on each end), and F-68 (79 EO groups on each end), on silica has been characterized using atomic force microscopy (AFM). The solvent used her...
| Veröffentlicht in: | Langmuir : the ACS journal of surfaces and colloids. - 1985. - 34(2018), 47 vom: 27. Nov., Seite 14180-14185 |
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| Weitere Verfasser: | , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2018
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| Zugriff auf das übergeordnete Werk: | Langmuir : the ACS journal of surfaces and colloids |
| Schlagworte: | Journal Article |
| Zusammenfassung: | Adsorption of triblock Pluronic surfactants bearing poly(ethylene oxide) (PEO) chains of different lengths, L-62 (5 EO groups on each end), L-64 (13 EO groups on each end), and F-68 (79 EO groups on each end), on silica has been characterized using atomic force microscopy (AFM). The solvent used herein was a mixture of ethylene carbonate (EC) and propylene carbonate (PC). The three Pluronic surfactants were dissolved in the mixed solvent, with the PEO chain acting as a solvophilic group and the poly(propylene oxide) (PPO) chain acting as a solvophobic group. The approaching force curve measurements for the three Pluronics (at 10 mmol dm-3) revealed repulsive forces from an apparent separation of 20-30 nm. The most solvophilic Pluronic surfactant with the longest PEO chain (F-68) showed continuously increasing repulsive interaction with decreasing separation. The Milner-Witten-Cates (MWC) theory described the repulsive force curve data of F-68, suggesting that F-68 forms a polymer brush on the silica surface. The retracting force curve measurements detected stretching forces for the three Pluronic systems. These stretching forces were observed more frequently for the L-62 system than for the F-68 system, but the pull-off distance was shorter for L-62 than for F-68 |
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| Beschreibung: | Date Completed 28.01.2019 Date Revised 28.01.2019 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1520-5827 |
| DOI: | 10.1021/acs.langmuir.8b02543 |