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(a) Phase selective gelation (toluene/water) followed by absorption of dye from the aqueous layer; (b) UV-vis spectra of dye absorption over time; (c) Aqueous methyl violate solution (0.02 mM) (left) and the solution after the addition of a xerogel made in toluene (right); (d) Phase selective gelation of a diesel-water mixture. Reprinted with permission from [61]. Copyright 2017 John Wiley & Sons, Inc. (Hoboken, NJ, USA).
