pH-Responsive Mercaptoundecanoic Acid Functionalized Gold Nanoparticles and Applications in Catalysis

Nanomaterials
Siyam M AnsarChristopher L Kitchens

Abstract

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. The AuNP-MUA were investigated as a reusable catalyst in the catalytic reduction of 4-nitrophenol by borohydride-a model reaction for AuNPs. It was determined that 100% MUA surface coverage completely inhibits the catalytic activity of AuNPs. Decreasing the surface coverage was shown to increase catalytic activity, but this decrease also leads to decreased colloidal stability, recoverability, and reusability in subsequent reactions. At 60% MUA surface coverage, colloidal stability and catalytic activity were achieved, but the surface coverage was insufficient to enable redispersion fol...Continue Reading

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Citations

Jan 19, 2021·Journal of Pharmaceutical Sciences·Mehreen RehmanM Aslam Zia
Apr 21, 2021·Chemical Communications : Chem Comm·Samantha F DoumanRobert J Forster
Apr 10, 2020·Journal of the American Chemical Society·Elizabeth M Higbee-DempseyAndrew Tsourkas
Nov 11, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Nancy M CativaCristina E Hoppe
Jan 13, 2022·Physical Chemistry Chemical Physics : PCCP·Masaki ItataniHideki Nabika

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Methods Mentioned

BETA
surface plasmon resonance

Software Mentioned

ImageJ

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