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Ph-Responsive Mercaptoundecanoic Acid Functionalized Gold Nanoparticles And Applications In Catalysis, Siyam M. Ansar, Saptarshi Chakraborty, Christopher L. Kitchens
Ph-Responsive Mercaptoundecanoic Acid Functionalized Gold Nanoparticles And Applications In Catalysis, Siyam M. Ansar, Saptarshi Chakraborty, Christopher L. Kitchens
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Mercaptoundecanoic acid (MUA) functionalized gold nanoparticles (AuNP-MUA) were synthesized and demonstrated to possess pH-triggered aggregation and re-dispersion, as well as the capability of phase transfer between aqueous and organic phases in response to changes in pH. The pH of aggregation for AuNP-MUA is consistent with the pKa of MUA (pH ~4) in solution, while AuNP-MUA phase transition between aqueous and organic phases occurs at pH ~9. The ion pair formation between the amine group in octadecylamine (ODA), the carboxylate group in MUA, and the hydrophobic alkyl chain of ODA facilitates the phase transfer of AuNP-MUA into an organic medium. …