A through C show the change in swelling ratio over time for 50 wt% PEGDA nanoparticles with or without co-monomers: No co-monomer (), 10 mol% HDDMA (), 30 mol% HDDMA (), 10 mol% DSDMA (), and 30% DSDMA () in different solvents. (n = 2). Swelling ratio reported in (A) pH 5 condition, (B) pH 7.4 condition, and (C) pH 10 conditions. Error bars present on all points; where not visible, the standard deviation is smaller than the data symbol.