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Experimental setup and fabrication of Alg-CA granular hydrogel. (a): (i) Illustration of the experimental setup; (ii) Chemical structure and illustration of the granular hydrogel. (b–d) Size distribution and fluorescence images of AC fabricated with different voltages; 5 kV (b), 10 kV (c), and 15 kV (d). Size and aspect ratio were measured from fluorescence images.
