Fig. 4. Co-encapsulation of nanoparticles of different types/sizes into supraparticle co-assemblies. (a) Different types of nanoparticles (SPIONs and QDs here) can be co-encapsulated to achieve multifunctionality (superparamagnetism and fluorescence here). (b) The number ratio of different colors (sizes) of QDs co-encapsulated into a supraparticle co-assembly can be controlled by the feed ratio of the assembly ‘reaction’. gQD: green QD; rQD: red QD.