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Tunability of Interactions between the Core and Shell in Rattle-Type Particles Studied with Liquid-Cell Electron

Tom A J Welling1, Kanako Watanabe2, Albert Grau-Carbonell1

  • 1Soft Condensed Matter, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands.

ACS Nano
|June 16, 2021
PubMed
Summary
This summary is machine-generated.

Core-shell nanoparticle interactions are tunable. Adding salt to dilute solutions confines the core, while deionized water reduces stability. These findings aid in designing stable nanorattles for applications.

Keywords:
electrical double layerelectrostatic interactionsliquid-cell electron microscopynanoparticlesrattle particlesyolk−shell

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Yolk-shell (rattle-type) particles feature a mobile core within a thin shell.
  • Stable, accessible core surfaces are crucial for catalysis and sensing.
  • Core-shell stability, especially with charged components, is not well understood.

Purpose of the Study:

  • To investigate the tunable interactions between charged nanoparticle cores and shells.
  • To explore the stability of nanorattles under varying salt concentrations.
  • To utilize liquid-cell transmission electron microscopy for high-resolution in-situ analysis.

Main Methods:

  • Theoretical calculations and experimental validation.
  • Liquid-cell (scanning) transmission electron microscopy (LC-STEM).
  • Systematic variation of salt concentration in aqueous solutions.

Main Results:

  • Monovalent salt addition in dilute solutions enhances core confinement.
  • In deionized water, reduced core-shell interaction impacts nanorattle stability.
  • At 0.5–250 mM salt, repulsion is long-ranged due to shell geometry.
  • High salt concentrations (100–250 mM) lead to core localization near the shell wall.

Conclusions:

  • Nanoparticle core-shell interactions are highly tunable via salt concentration.
  • LC-STEM provides high-resolution insights into dynamic nanoparticle behavior.
  • Understanding these interactions is key for designing advanced nanostructures for various applications.