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Related Experiment Video

Updated: Sep 22, 2025

Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity
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A theoretical study on spontaneous dipole orientation in ice structures.

S Rasoul Hashemi1, Martin R S McCoustra2, Helen J Fraser3

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Summary

Simulated porous amorphous solid water ice films exhibit spontaneous dipole orientation, generating a negative electric field at low temperatures. This field

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Science

Background:

  • Amorphous solid water (ASW) ice films are relevant in various astrophysical and atmospheric contexts.
  • Understanding dipole orientation in ice is crucial for explaining planetary atmospheres and interstellar ice.

Purpose of the Study:

  • To investigate spontaneous dipole orientation in simulated porous ASW ice films.
  • To determine the resulting electric field and surface potential as a function of temperature.

Main Methods:

  • Simulations of porous ASW ice films on a substrate.
  • Varying substrate temperatures from 10 K to 140 K.
  • Analysis of water dipole orientation and generated electric fields.

Main Results:

  • At low temperatures (10-140 K), water dipoles orient to produce a negative electric field (10^8-10^9 V m^-1).
  • The electric field magnitude increases with height above the substrate.
  • A strong temperature dependence of the surface potential was observed, decreasing with increasing temperature.

Conclusions:

  • Spontaneous dipole orientation in ASW ice films generates significant electric fields.
  • Surface potential approaches zero around 110 K, indicating a transition in dipole ordering.
  • The findings provide insights into the electrical properties of astrophysical ices.