图 2.
SEM observation
扫描电镜观察
a. CMC 凝胶（×35）；b. GO-CMC 凝胶（×35）；c. GO-CMC 凝胶孔壁附着的 GO（×2 000）
a. CMC hydrogel (×35); b. GO-CMC hydrogel (×35); c. GO attached to the wall of GO-CMC hydrogel (×2 000)
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