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. Author manuscript; available in PMC: 2013 Dec 10.
Published in final edited form as: J Control Release. 2012 Oct 12;164(2):236–246. doi: 10.1016/j.jconrel.2012.10.007

Fig. 7.

Fig. 7

Ligand density on antigen-labeled Au nanoparticles with co-adsorbed PEG, characterized by an antibody-functionalized AFM probe tip (inset, upper left). As the PEG size increases, the number of measureable ligand–receptor interactions decreases (F ~180 pN), with a commensurate rise in nonspecific substrate–tip interactions (F ~20 pN).