Synthesis and characterization of polymer-protected rhodium and palladium sols in mixed media

► Rh and Pd sols were generated in mixtures of water and an organic solvent. ► Particle size was inversely proportional to cosolvent concentration. ► Sol stability depended nonlinearly on cosolvent concentration. ► Protecting agents used ordinarily in 100% aqueous dispersion media were shown to be mostly effective in the mixed media. ► Adsorption of CO decreased as cosolvent concentration was increased.