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Atomic force microscopy (AFM) phase images of the gels formed by: (a) compound 20c in water at 2.9 mg/mL; (b) compound 20j in DMSO/H2O (v/v 1:2) at 1.4 mg/mL; (c) compound 20l in DMSO/H2O (v/v 1:8) at 2.25 mg/mL with toluidine blue dye (0.031 mg/mL) entrapped. Reprinted with permission from [52]. Copyright 2020 American Chemical Society.
