Mean particle size (A) and size distribution (B) of PNIPA/AA nanohydrogels.

<p>Nanohydrogels with 3% (○) and 5% (•) of the cross-linking (CL) degree were previously swelled and measured in distilled water (pH 5.5) at 25°C. The table with the polydispersity index (PDI) values indicates the nanoparticles size dispersion.