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Core-shell type MNP schematics and their coating components for assembling with virus particles. A PEI-Mag2 particle coating comprises 32 mass% PEIBr-25 kDa and 68 mass% Zonyl-FSA. B The silica-iron oxide MNPs SO-Mag6-11.5 are decorated with PEIBr-25 kDa in a PEI-to-Fe w/w ratio of 11.5 %. C Structural formulas of the 25 kD branched polyethyleneimine (PEIBr-25 kDa) and the fluorinated surfactant Zonyl FSA (n = 10, MW = 657.9 from XPS data), both used for nanoparticle coating.
