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Related Concept Videos

Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...

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Compact Peptoid Molecular Brushes for Nanoparticle Stabilization.

Shih-Ting Wang1, Honghu Zhang1, Sunting Xuan2

  • 1Center for Functional Nanomaterials, Brookhaven National Laboratory, Brookhaven Avenue, Upton, New York 11973, United States.

Journal of the American Chemical Society
|April 22, 2022
PubMed
Summary
This summary is machine-generated.

Sequence-defined peptoids offer a flexible strategy for stabilizing various nanoparticles, including gold nanoparticles (AuNPs). A specific peptoid (PE5) provides superior stability and forms a compact shell, enabling self-assembly and plasmonic coupling in nanoparticle films.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Controlling nanoparticle interfaces is vital for applications in nanomaterials, optics, catalysis, and nanomedicine.
  • Existing methods for nanoparticle functionalization require more flexible approaches to tailor interfacial molecule chemistry and structure for diverse environments.
  • There is a need for stabilizing molecules that maintain a small size for the nanoparticle molecular shell.

Purpose of the Study:

  • To demonstrate a flexible strategy for stabilizing nanoparticles using low-molecular-weight, bifunctional peptoids.
  • To investigate the impact of peptoid design, specifically the arrangement of binding and solvation domains, on nanoparticle stability.
  • To explore the versatility of peptoid functionalization across different types of nanoparticles.

Main Methods:

  • Synthesis of sequence-defined, comb-shaped peptoids with varied arrangements of nanoparticle-binding and oligo-ethylene glycol (EG) solvation domains.
  • Functionalization of gold nanoparticles (AuNPs) and other noble metal and oxide nanoparticles (silver, platinum, iron oxide) with designed peptoids.
  • Characterization of nanoparticle stability in diverse aqueous and organic solutions using experimental techniques.
  • Molecular dynamics simulations to elucidate the stabilization mechanisms.
  • Investigation of self-assembly behavior at the vapor-aqueous interface and properties of resulting nanoparticle films.

Main Results:

  • Low-molecular-weight, bifunctional peptoids effectively stabilize gold nanoparticles (AuNPs).
  • The strategy is general, enabling the coating of silver, platinum, and iron oxide nanoparticles.
  • A specific diblock peptoid (PE5) demonstrated superior colloidal stability in aqueous solutions with a compact shell (∼1.5 nm).
  • PE5-coated AuNPs (PE5/AuNPs) exhibited stability in organic solvents due to strong amine-gold binding and oligo-EG solubility.
  • PE5/AuNPs self-assembled into ordered 2D lattices at the vapor-aqueous interface, forming films with strong near-field plasmonic coupling.

Conclusions:

  • Sequence-defined peptoids provide a robust and flexible platform for nanoparticle stabilization and functionalization.
  • The PE5 peptoid offers excellent colloidal stability and controlled shell formation for gold nanoparticles.
  • Peptoid-functionalized nanoparticles exhibit promising self-assembly properties and potential for plasmonic applications.