The spatial distribution of metallic nanoparticles in the microgels was analyzed by small angle X-ray scattering (SAXS) and the results indicated that metal nanoparticles were mainly located in the inner layer of microgels. 
SAXS
Preparation and characterization of Ag-Pd bimetallic nano-catalysts in thermosensitive microgel nano-reactor.Thermosensitive microgels consisting of a solid core of polystyrene and a shell of cross-linked poly(N-isopropylacrylamide) (PNIPA) were synthesized as nano-reactors, in which Ag-Pd bimetallic nanoparticles were prepared through simultaneous in situ reduction reaction.  The data demonstrated that Ag-Pd bimetallic nanoparticles showed enhanced catalytic activity compared to each monometallic nanoparticle alone and their catalytic activity was controllable by temperature due to the volume transition of PNIPA microgels.
PNIPA