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Appearance of the G0/0.3 sample at different stages: (a,b) G0/0.3 xerogel observed in the dry state as obtained by bulk polymerization; (c,d) photographs of the equilibrium water- and DMSO-swollen G0/0.3 hydrogel, respectively, (e,f) cryo-SEM from the water-swollen sample and (g,h) high vacuum scanning electron microscopies (HVSEM) of the lyophilized sample.
