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. 2022 Dec 30;9(1):35. doi: 10.3390/gels9010035

Figure 7.

Figure 7

The schematic representation with respect to the synthesis and structure of Cn nm gels. (a) The dissolution process of chitosan in alkaline solution; (c) The structure of gels with only 4r-PEG-CHO; (d) The structure of gels with 4r-PEG-CHO and 4r-PEG-NH2; (e) The molecular structure of the reactants. The SEM image on the right belongs to C2-N0 gel, the SEM images on the top left and bottom left belong to C2-N2 gel and C2-N4 gel, respectively, adopted from [36] with permission from Elsevier through copyright clearance center. PEG: Polyethyleneglycol.