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Hydration forces between gold nanoparticles in water prevent direct contact until the hydration shells fully dehydrate. This reveals metastable nanoparticle dimers, impacting natural and industrial processes.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Solvation forces, particularly hydration forces in water, influence interactions between surfaces at the nanoscale.
  • The dynamic effects of hydration forces on transient interaction steps between nanoscale entities in solution remain poorly understood.

Purpose of the Study:

  • To investigate the role of hydration forces in the interaction dynamics of gold nanoparticles in water.
  • To elucidate the transient steps involved in nanoparticle interactions and dimer formation.

Main Methods:

  • Utilized in situ transmission electron microscopy (TEM) to observe gold nanoparticles in aqueous solution.
  • Analyzed nanoparticle interactions at distances within approximately two water molecules (∼5 Å).

Main Results:

  • Observed the formation of sterically stabilized transient nanoparticle dimers when gold nanoparticles approached within the combined thickness of their hydration shells.
  • Demonstrated that nanoparticle surface contact and subsequent coalescence occur only after complete dehydration of the interacting surfaces.
  • Identified the formation of metastable nanoparticle pairs mediated by the hydration layer.

Conclusions:

  • Hydration forces play a critical role in mediating transient nanoparticle interactions, leading to the formation of temporary, stabilized dimers.
  • The dehydration process is a prerequisite for nanoparticle coalescence, highlighting the influence of the hydration shell.
  • These findings have significant implications for understanding and controlling processes involving nanoparticle assembly in both natural and industrial settings.