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Flow effects on silicate dissolution and ion transport at an aqueous interface.

Cheng Lian1, Xian Kong, Honglai Liu

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Flowing water dramatically alters silica surface reactions and structure, impacting dissolution rates and surface charge. This study models these complex fluid-surface interactions for better technological applications.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Fluid Dynamics

Background:

  • Understanding molecular-level flow effects on solid-liquid interfaces is crucial for many technologies.
  • Current knowledge of these phenomena, particularly at the nanoscale, is limited.

Purpose of the Study:

  • To investigate the molecular mechanisms of flow effects on solid-liquid interface chemistry.
  • To model the interplay between laminar flow and surface reactions.

Main Methods:

  • Classical density functional theory for ion distributions.
  • Kinetics modeling.
  • Navier-Stokes equation for fluid dynamics.

Main Results:

  • Laminar flow significantly alters silica dissolution rates and surface properties.
  • Observed changes in surface charge density and interfacial structure.
  • Predicted a nonlinear streaming current due to flow-induced reaction disturbances.

Conclusions:

  • The coupling of laminar flow and surface chemistry can be accurately modeled.
  • Flow significantly impacts solid-liquid interfacial processes, with implications for material science and nanotechnology.
  • The findings align with and explain recent experimental observations.