A chitosan-graft-polyethyleneimine copolymer (CS-g-PEI) was prepared by an N,N′-carbonyl diimidazole (CDI) coupling method as a drug carrier for PolyI:C and simulated antigen ovalbumin (OVA). Nanoparticles of CS-g-PEI-PolyI:C/OVA with good solution stability, coating effect, immune characteristics and suitable size were prepared through electrostatic self-assembly. CS-g-PEI protected PolyI:C from nuclease degradation and is a reliable drug carrier for the delivery of PolyI:C.

Oil-in-water-in-oil (O/W/O) double Pickering emulsions were prepared using purified and modified attapulgite (ATP) and modified nano-Fe₃O₄ as stable particles and then used as templates to form ATP/P(MMA-BMA-St)/Fe₃O₄ composite porous resins. The experiment provides a simple, economic and environmentally friendly method for the preparation of inorganic–organic composite porous materials, which are expected to have great application potential in the field of oil treatment.