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Researchers observed accelerated gold nanorod etching by oxygen nanobubbles. This solid-liquid-gas reaction is enhanced by van der Waals forces, offering insights for designing efficient chemical processes.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Solid-liquid-gas reactions are crucial in natural and industrial settings.
  • Understanding gas transport and interfacial reactions at the triple-phase boundary is key for optimizing these processes.

Purpose of the Study:

  • To investigate the real-time dynamics of gas transport and etching at the solid-liquid-gas interface.
  • To elucidate the mechanism behind accelerated etching of gold nanorods by oxygen nanobubbles.

Main Methods:

  • Real-time observation using liquid-cell transmission electron microscopy (LCTEM).
  • In situ etching experiments of gold nanorods in aqueous hydrobromic acid with oxygen nanobubbles.
  • Molecular dynamics (MD) simulations to analyze interfacial interactions.

Main Results:

  • Observed significant enhancement (over one order of magnitude) in the local etching rate of gold nanorods when oxygen nanobubbles are within ~1 nm.
  • MD simulations revealed that strong van der Waals interactions facilitate oxygen molecule transport to the gold surface through the thin liquid layer.

Conclusions:

  • Van der Waals forces play a critical role in accelerating solid-liquid-gas reactions by enhancing gas transport to the interface.
  • The findings provide fundamental insights for the rational design of solid-liquid-gas reaction systems to achieve enhanced activities.