Intermolecular forces at ice and water interfaces: Premelting, surface freezing, and regelation.

Area of Science:

• Physical Chemistry
• Surface Science
• Materials Science

Background:

• Understanding interfacial phenomena in ice-water systems is crucial for various applications.
• Van der Waals forces play a significant role at interfaces, influencing material properties.
• Premelting phenomena at the ice surface are complex and depend on environmental conditions.

Purpose of the Study:

• To quantitatively model the surface free energy of premelting ice films.
• To predict the behavior of quasi-liquid layer thickness based on ambient conditions.
• To investigate the role of intermolecular forces in subsurface freezing and ice regelation.

Main Methods:

• Application of Lifshitz theory to assess van der Waals forces at ice-water interfaces.
• Integration of computer simulations for structural forces and wetting theory.
• Development of a quantitative model for surface free energy and layer thickness prediction.

Main Results:

• Vapor pressure significantly influences premelting behavior, enabling complete surface melting above water saturation.
• Subsurface ice nucleation is favored only under water undersaturation.
• Ice regelation can be explained by capillary freezing, not bulk pressure melting.

Conclusions:

• The study provides a quantitative model for ice-water interfacial phenomena.
• Interfacial forces and ambient conditions dictate premelting and freezing behaviors.
• Results aid in refining empirical models for water interactions and dispersion forces.