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. Author manuscript; available in PMC: 2014 Nov 7.
Published in final edited form as: Nanoscale. 2013 Sep 9;5(21):10.1039/c3nr03442a. doi: 10.1039/c3nr03442a

Fig. 4.

Fig. 4

TEM images of particles without surface modifications (4A) and with both nanomachine and PEI-PEG co-polymer modifications (4B). The scale bar is 50 nm for the inset TEM images. The images show similar particle morphology and dispersibility. 4C shows the release profiles of the SPEIPEG group. The nanomachines in SPEIPEG-1 and SPEIPEG-3 were maintained closed under neutral pH and were opened upon pH change, releasing the cargos. For SPEIPEG-3, the release was complete at 6 hours. The release amount is the weight percentage of the released cargos over the nanoparticles.