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Area of Science:

  • Materials Science
  • Surface Science
  • Crystallography

Background:

  • Silver iodide (AgI) is a highly effective ice-nucleating agent.
  • Its efficiency is linked to lattice matching with hexagonal ice.
  • The atomic-level mechanism and surface structure of AgI's ice nucleation are not fully understood.

Purpose of the Study:

  • To elucidate the atomic-level mechanism of ice nucleation by AgI.
  • To determine the atomic structure of basal AgI surfaces.
  • To understand how surface structure influences ice nucleation efficiency.

Main Methods:

  • Noncontact atomic force microscopy (nc-AFM) in ultrahigh vacuum.
  • Advanced computational modeling (e.g., density functional theory).
  • Analysis of surface reconstructions on AgI basal planes.

Main Results:

  • The Ag-terminated (0001) AgI surface reconstructs to a (2 × 2) structure with ordered Ag vacancies.
  • This Ag-terminated surface preserves a hexagonal arrangement of atoms, facilitating epitaxial ice growth.
  • The I-terminated (000[Formula: see text]) AgI surface shows a rectangular reconstruction, hindering continuous ice layer formation.

Conclusions:

  • Surface atomic structure critically determines ice nucleation efficiency on AgI.
  • The Ag-terminated basal plane, with its specific reconstruction, is primarily responsible for efficient ice nucleation.
  • Understanding these surface structures is key to designing better ice-nucleating agents.