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(A) Exemplary SEM image of a ZnO tetrapod, which serves as basic constituent of sacrificial templates for the production of microchannel-containing hydrogels. The SEM images allow the determination of the tetrapod size by image analysis. A histogram of the tetrapod diameter, measured at the base of the tetrapod arms is shown in B. The distribution ranges from 1.5 to 8.75 μm and peaks at 3 μm.
