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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Crystallization

Background:

  • Heterogeneous nucleation is key to water freezing.
  • The influence of non-planar surface geometries on nucleation is not well understood.

Purpose of the Study:

  • Investigate the role of atomically sharp, concave wedge geometries in promoting ice nucleation.
  • Explore how specific wedge angles and lattice interactions affect nucleation enhancement.

Main Methods:

  • Molecular analysis of water freezing on wedge-shaped surfaces.
  • Simulations focusing on geometric effects and defect formation during nucleation.

Main Results:

  • Atomically sharp concave wedges can significantly promote ice nucleation.
  • A 45° wedge geometry was found to be particularly effective, enhancing nucleation through topological defect formation.
  • Enhanced nucleation occurred with and without a direct lattice match between the wedge and ice.

Conclusions:

  • Specific non-planar geometries, like wedges, actively promote ice nucleation.
  • Topological defects play a crucial role in catalyzing ice growth.
  • The concept of 'lattice match' should be expanded to include metastable, non-crystalline structural motifs for nucleation centers.