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Ice Nucleation Regulation by Nanoscale Surface Topography.

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This study provides the first experimental evidence that surface curvature bidirectionally regulates ice nucleation. Nanoscale convex surfaces suppress ice formation, while concave surfaces promote it, aligning with classical nucleation theory predictions.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Climate Science

Background:

  • Heterogeneous ice nucleation is crucial for climate, biology, and technology.
  • Classical nucleation theory (CNT) predicts surface curvature influences nucleation, but experimental evidence is conflicting.
  • Previous studies lacked explicit experimental validation of CNT's predictions on surface topography's role in ice nucleation.

Purpose of the Study:

  • To experimentally resolve the controversy surrounding surface curvature's effect on ice nucleation.
  • To provide the first evidence of bidirectional regulation of ice nucleation by engineered surfaces.
  • To bridge theoretical predictions of CNT with practical ice-control applications.

Main Methods:

  • Precisely engineered nanoscale convex (nanosphere) and concave (nanopore) surfaces were utilized.
  • Systematic experiments were conducted to observe ice nucleation from both liquid and vapor phases.
  • Ice nucleation temperatures and rates were measured across varying curvature radii.

Main Results:

  • Observed size-dependent trends in ice nucleation, confirming bidirectional regulation.
  • Ice nucleation temperatures and rates decreased on convex surfaces as radii decreased.
  • Ice nucleation temperatures and rates increased on concave surfaces as radii decreased, aligning with CNT.

Conclusions:

  • Experimental results validate CNT predictions regarding surface curvature's role in ice nucleation.
  • This work demonstrates precise control over ice nucleation via engineered surface topographies.
  • Findings have implications for advancing ice-control engineering and understanding climate processes.