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Scanning electron microscopy (SEM) images of the top view (a1–c1) and the cross section (a2–c2) of cotton fabric grafted with alginate-Ca2+/P(NIPAAm-co-EGMA360) hydrogels. The monomer ratios of NIPAAm to EGMA360 are (a1,a2) 20:0, (b1,b2) 19.5:0.5, and (c1,c2) 18.5:1.5.
