Figure 3From: Delivery of small interfering RNAs in human cervical cancer cells by polyethylenimine-functionalized carbon nanotubesSEM images of pristine and PEI-functionalized carbon nanotubes. The surface morphology of pristine SWNTs (A) and MWNTs (C) was compared with that of PEI-NH-SWNTs (B) and PEI-NH-MWNTs (D) by a JSM-6500F SEM. Bar 100 nm.Back to article page