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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Mesophase Formation Stabilizes High-Purity Magic-Sized Clusters.

Douglas R Nevers1, Curtis B Williamson1, Benjamin H Savitzky2

  • 1Robert F. Smith School of Chemical and Biomolecular Engineering , Cornell University , Ithaca , New York 14850 , United States.

Journal of the American Chemical Society
|January 30, 2018
PubMed
Summary
This summary is machine-generated.

High concentration synthesis yields highly pure magic-sized clusters (MSCs) by forming a stabilizing organic-inorganic mesophase. This mesophase prevents nanoparticle growth, offering a new understanding of MSC stabilization beyond atomic packing.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Synthesis

Background:

  • Magic-sized clusters (MSCs) exhibit unique stability and uniform size, inhibiting conventional nanoparticle growth.
  • Understanding the nucleation and stabilization pathways of MSCs remains a critical research challenge.

Purpose of the Study:

  • To investigate the influence of high concentration synthesis on MSC formation and stability.
  • To elucidate the role of accompanying phases in MSC stabilization.

Main Methods:

  • High concentration (1000 mM) synthesis of MSCs.
  • In situ X-ray scattering analysis to study reaction pathways and phase formation.
  • Investigation of MSC behavior at varying concentrations (500 mM, <200 mM).

Main Results:

  • High concentration synthesis (>99.9% purity) produces highly stable MSCs resistant to growth and dissolution.
  • A large, hexagonal organic-inorganic mesophase formed at high concentrations arrests MSC growth and prevents nanoparticle formation.
  • Intermediate and low concentrations lead to unstable mesophases and dominant nanoparticle formation.

Conclusions:

  • MSC stability can be attributed to self-forming fibrous mesophase assemblies, not solely closed-shell atomic packing.
  • High concentration synthesis reveals concentration-dependent surfactant phase behavior crucial for MSC stabilization.
  • This work provides a robust method for synthesizing and stabilizing MSCs, highlighting surfactant-cluster interactions.