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Abstract | Cited by

This work reveals, for the first time, that polymer–ionic-liquid-based aqueous biphasic systems (ABS) exhibit a much wider hydrophilic–hydrophobic range than conventional systems reported to date. Three probe dyes were used to demonstrate that either the polymer-rich or the ionic-liquid-rich layer can serve as the most hydrophobic phase. It was found that the phase polarities can be easily tuned by the choice of an appropriate ionic liquid.

Graphical abstract: Combining ionic liquids and polyethylene glycols to boost the hydrophobic–hydrophilic range of aqueous biphasic systems

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