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. Author manuscript; available in PMC: 2014 Oct 30.
Published in final edited form as: J Am Chem Soc. 2013 Oct 16;135(43):16030–16033. doi: 10.1021/ja4082414

Figure 2.

Figure 2

(a, b) TEM and optical images of RITC labeled PEG-PEI (a) and PEG-NMe3+(b) MSNPs following removal of surfactant, scale bar = 25 nm. (c, d) Hydrodynamic diameters of PEG-PEI (c) and PEG-NMe3+ (d) MSNP vs aging time in various solutions.