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. 2016 May 4;7:11515. doi: 10.1038/ncomms11515

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(a) Freshly prepared CNC–PAAm composite hydrogel. (b) POM image of a fresh hydrogel section. (c) Dried gel. (d) POM image of a dried hydrogel section. Evaporation time and estimated CNC concentration for these images are 6 h and 4.4 wt%. Diameter of the Petri dishes in a and c is 60 mm. Scale bars, 200 μm (b and d).