水凝胶SEM/EDS分析：交联密度对微观结构影响机制解析

2.2.5 Scanning Electron Microscopy and Energy Dispersive Spectroscopy Analysis SEM images revealed the regularity of the hydrogel microstructure as the degree of crosslinking changed: as the degree of crosslinking increased from 1.32 × 10^-4 to 2.63 × 10^-3, the porous structure evolved from loose large pores to a uniform network, ultimately becoming dense at high crosslinking degrees. When the crosslinking density is too high, it becomes difficult for the hydrogel to form a distinct porous structure, which may lead to a decrease in its mechanical properties (Figure 3c). Additionally, C, N, O, and Y were uniformly distributed at the microscopic level, with elemental mass percentages of 56.2 ± 0.45%, 19.15 ± 0.51%, 23.25 ± 0.29%, and 1.4 ± 0.29%, respectively; and atomic number percentages of 62.26%, 18.19%, 19.34%, and 0.21% (Figure 3e,f).