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A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization

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Published on: August 18, 2022

Entropy-driven liquid-liquid separation in supercooled water.

V Holten¹, M A Anisimov

¹Institute for Physical Science & Technology, University of Maryland, College Park, Maryland 20742, USA.

Scientific Reports

|October 12, 2012

Summary

This summary is machine-generated.

A new thermodynamic model explains supercooled water properties by proposing a critical point driving liquid-liquid separation. This entropy-driven model accurately describes experimental data for water

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Area of Science:

Thermodynamics
Physical Chemistry
Materials Science

Background:

Supercooled water exhibits anomalous properties not fully explained by existing models.
Poole et al. (2000s) hypothesized a liquid-liquid critical point for water's unique behavior.

Purpose of the Study:

To develop and validate a thermodynamic model for supercooled water based on the liquid-liquid separation hypothesis.
To provide a more accurate and parsimonious explanation for supercooled water's anomalous properties.

Main Methods:

Developed a thermodynamic model treating water as an "athermal solution" of two molecular structures.
The model incorporates entropy-driven phase separation and an equilibrium constant for critical temperature.

Main Results:

The proposed model accurately describes available experimental data for supercooled water.
Achieved higher quality and fewer adjustable parameters compared to existing models.
Predicts density maxima location based on a constant fraction of lower-density water structure.

Conclusions:

The liquid-liquid separation hypothesis provides a robust framework for understanding supercooled water.
The model offers a new perspective on water's behavior, driven by entropy rather than energy.
This work validates the critical point hypothesis and refines our understanding of water's phase transitions.