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

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Hielo amorfo de densidad media

Alexander Rosu-Finsen¹, Michael B Davies^2,3, Alfred Amon¹

¹Department of Chemistry, University College London, London WC1H 0AJ, UK.

Science (New York, N.Y.)

|February 2, 2023

Resumen

Este resumen es generado por máquina.

Los investigadores descubrieron una nueva forma de hielo amorfo, el hielo amorfo de densidad media (MDA), a través de la molienda de bolas. Este hallazgo desafía la brecha de densidad establecida en el agua

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Área de la Ciencia:

Ciencias de los materiales
Cosmología
La geofísica

Sus antecedentes:

Los hielos amorfos juegan un papel en los procesos cosmológicos y explican las anomalías del agua líquida.
La comprensión actual del agua se basa en una brecha de densidad entre el hielo amorfo de baja densidad y de alta densidad.

Objetivo del estudio:

Investigar la existencia y las propiedades de las estructuras de hielo amorfo.
Desafiar el modelo de densidad establecida para el agua amorfa.

Principales métodos:

Moldeo en bolas de hielo ordinario I a bajas temperaturas.
Análisis estructural del hielo amorfo resultante.
Compresión del hielo amorfo de densidad media (MDA) sintetizado.

Principales resultados:

Descubrimiento de un hielo amorfo de densidad media (MDA) estructuralmente distinto dentro de la brecha de densidad previamente conocida.
MDA puede representar el verdadero estado vidrioso del agua líquida o un estado cristalino cortado.
La compresión de MDA aumenta significativamente su entalpía de recristalización.

Conclusiones:

La existencia de MDA desafía el modelo tradicional de dos estados de agua amorfa.
MDA podría ser el estado amorfo genuino del agua, impactando nuestra comprensión de sus anomalías.
El agua, en sus formas amorfas, puede funcionar como un material geofísico de alta energía.