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Equator of PAAc–PAAm spheres swelling in hydrogel forming (A and B) or nonhydrogel forming (C and D) solutions: (A) Pluronic F127 aqueous solution (10 wt%), (B) PVA aqueous solution (10 wt%), (C) PVP aqueous solution (10 wt%), and (D) PEG aqueous solution (10 wt%). (Immersion time, 20 min.)
