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Scanning electron microscopy micrographs (SEM): (a) curcumin, (b) curcumin: 2-hydroxypropyl-β-cyclodextrin complex, (c) p(NiPMAm/NiPAm) hydrogel containing 2 mol% EGDM, (d) p(NiPMAm/NiPAm) hydrogel containing 2 mol% of crosslinker with incorporated curcumin: 2-hydroxypropyl-β-cyclodextrin complex.
