The M205-C stereo microscope (Leica Microsystems, Heerbrugg, Switzerland) was used to analyze the morphology of the hydrogels and observe their surfaces in detail [77 (link)]. A magnification of 1.5 and 4 was used on EG-methanolic/NRC, EG-methanolic/MCC, EG-ethanolic/NRC, EG-ethanolic/MCC, WE/NRC, and WE/MCC for surface analysis. The three-dimensional structure of the cellulose hydrogel suffered swelling in the presence of an aqueous medium, and the ability to retain different volumes of water was evaluated.
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