- Title
- The effect of ionic liquid hydrophobicity and solvent miscibility on pluronic amphiphile self-assembly
- Creator
- Sharma, Suraj Chandra; Atkin, Rob; Warr, Gregory G.
- Relation
- Australian Research Council
- Relation
- The Journal of Physical Chemistry Part B Vol. 117, Issue 46, p. 14568-14575
- Publisher Link
- http://dx.doi.org/10.1021/jp4086443
- Publisher
- American Chemical Society
- Resource Type
- journal article
- Date
- 2013
- Description
- The phase behavior of the triblock copolymer, (EO)₂₀(PO)₇₀(EO)₂₀ (P123), in the water-immiscible (hydrophobic) ionic liquids (ILs), 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF₆), and tris(pentafluoroethyl)trifluorophosphate (bmimFAP), has been investigated, and its amphiphilic self-assembly examined using small-angle X-ray scattering. The results obtained are contrasted with those for P123 in water. Direct and water-swellable micellar, hexagonal, and lamellar phases of P123 are found in bmimPF₆, which behaves like a polar solvent despite being water immiscible, but bmimFAP behaves as a truly hydrophobic solvent, forming only a lamellar phase over a narrow composition range. The miscibility of bmimPF₆ and water is increased by P123 addition, and at sufficiently high P123 concentrations, a single lamellar phase forms in which bmimPF₆ and water are miscible in all proportions. In contrast, the preferential solubilization of bmimPF₆ by PEO chains and bmimFAP by PPO chains causes the nanosegregation of these miscible ILs in concentrated P123 solutions. This leads to the formation of a P123/bmimPF₆/bmimFAP microemulsion where bmimPF₆ is the polar solvent and bmimFAP is the non-polar solvent.
- Subject
- chemistry; triblock copolymer; X-ray scattering; pluronic amphiphile; ionic liquid hydrophobicity; solvent miscibility
- Identifier
- http://hdl.handle.net/1959.13/1340853
- Identifier
- uon:28594
- Identifier
- ISSN:1520-6106
- Language
- eng
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