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(a) DOX release from the filamentous ZIF-8 NTs. The inset shows the expanded plot for the release process from 0 to 6 h; SEM images of the filamentous ZIF-8 NTs immersed in (b) phosphate-buffered saline (pH = 7.4) for one week and acidic phosphate buffer (pH = 5.0) for (c) 0 min, (d) 8 min, (e) 1 h and (f) one week; (g) Cytotoxicity of ZIF-8 NTs; (h) Cytotoxicity of doxorubicin (black) and doxorubicin-loaded ZIF-8 NTs (red).
