Figure 7From: Delivery of small interfering RNAs in human cervical cancer cells by polyethylenimine-functionalized carbon nanotubesZeta potential of pristine and PEI-functionalized carbon nanotubes. The zeta potential of 1 mg/ml pristine or PEI-grafted carbon nanotubes at 25°C and neutral pH was determined by dynamic light scattering. Error bars represent standard deviations (n ≥ 3). **p < 0.01 compared to PEI-NH-SWNTs.Back to article page