Fig. 3.

(A) Sulfide nanogels (simulating HS) to shield virus particles (rigid nanogel [R-NG] and flexible nanogel [F-NG]) [46]. (B) Schematic representation of flexible and rigid dPGS-based nanogels. Using linPG and dPG as cross-linkers, respectively, they were prepared by strain-promoted azide–alkyne ring addition reaction via reverse nanoprecipitation technique. The scheme shows the structure of dPG and the models of rigid and flexible nanogels [46]. (C) The terminal groups of the PAMAM dendrimers used were sodium carboxylate, primary amine, hydroxyl, and succinic acid. PAMAM, polyamidoamine [44].