Figure 1.
(a) Schematic illustration of hydrogel formation. Scanning electron microscope (SEM) image of as-obtained PVA/PAA-CD/PAA-Azo hydrogels: (b) Gel-A, (c) Gel-B, (d) Gel-C, and (e) Gel-D. Photograph courtesy of “Nan Hou.” Copyright 2020.
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