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Swelling behaviors of the porous PNIPA hydrogel. a) The temperature dependence of the swelling ratio (d/d 0) of the porous PNIPA hydrogel, prepared by a colloidal amorphous array composed of fine silica particles (341 nm diameter) in water. d is the observed diameter of the porous PNIPA hydrogel. b) The progression of swelling in the bulk and porous disk‐shaped PNIPA hydrogels in water in response to rapid temperature change. The lower curve shows the change in temperature.
