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SEM images of Fe0 nanoparticles immobilized in P(NIPAAm-AA) hydrogel, A-Fe0 nanoparticles immobilized in hydrogel by in situ synthesis; B-Fe0 nanoparticles immobilized in hydrogel by encapsulation. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.]
