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QCM-D study of the swelling–deswelling of PEGDA-co-AA hydrogel coating at different pH solutions. Arrows and labels indicate injections of HCl (pH 2.2) solution, PBS (pH 7.4), and the final HCl (pH 2.2) solution, respectively. (Reprinted with permission from [25], Whiley 2009 copyright n. 4710141377265).
