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Nanoparticle Ligand Exchange via Phase Transfer Using Sterically Encumbered m-Terphenyl Isocyanides.

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Ligand exchange via phase transfer (LEPT) enables nanoparticle functionalization. This study reveals solvent, concentration, and pH influence LEPT kinetics for gold nanospheres, improving extraction and separation methods.

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Area of Science:

  • Colloidal chemistry
  • Nanotechnology
  • Surface science

Background:

  • Ligand exchange via phase transfer (LEPT) is crucial for nanoparticle (NP) surface functionalization.
  • LEPT enhances NP dispersibility, stability, and biocompatibility, facilitating NP extraction using immiscible solvents.
  • Selective NP surface ligation via LEPT remains a challenge despite its common use in postsynthetic processing.

Purpose of the Study:

  • Investigate the LEPT mechanism and parameters affecting NP functionalization with m-terphenyl isocyanide ligands.
  • Examine the extraction efficiency of gold nanospheres (AuNSs) from water to organic solvents using LEPT.
  • Understand how various factors influence LEPT kinetics for tailored NP separation.

Main Methods:

  • Detailed examination of gold nanosphere (AuNS) extraction from water to organic solvents.
  • Systematic variation of solvent choice, AuNS and ligand concentration, and pH.
  • Kinetic analysis of LEPT to compare with theoretical predictions.

Main Results:

  • LEPT kinetics for AuNSs are influenced by solvent choice, AuNS and ligand concentration, and pH.
  • Observed LEPT kinetics deviate from predictions based solely on ligand binding energies and molecular solubilities.
  • Demonstrated control over NP functionalization and extraction efficiency through parameter tuning.

Conclusions:

  • Provides a comprehensive understanding of LEPT with m-terphenyl isocyanides.
  • Highlights the importance of experimental parameters beyond binding energies and solubility.
  • Offers pathways for developing tailored NP extraction and separation methods for improved NP utility.