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Pillai, Pramod P.,Kowalczyk, Bartlomiej,Pudlo, Wojciech J.,Grzybowski, Bartosz A. American Chemical Society 2016 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.120 No.7
<P>A general-purpose procedure based on electrostatic titrations was developed to determine the compositions of mixed self-assembled monolayers (m-SAMs) of oppositely charged ligands on metal nanoparticles (NPs). In this procedure, nanoparticles of unknown m-SAM compositions and charges are titrated with the positively charged NP 'standards'. These compositions and the differences in the free energies of adsorption of the [+] and [-] are then determined from the points of precipitation at which the overall charge on all NPs is neutralized. The results of the titrations agree well with traditional core-etching/NMR studies. However, the titration-based approach is nondestructive and requires significantly less material than NMR.</P>