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La nucleación de hielo hexagonal (Ih) en agua líquida
Ravi Radhakrishnan1, Bernhardt L Trout
1Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
Journal of the American Chemical Society
|June 19, 2003
Resumen
Los investigadores observaron el elusivo proceso de nucleación de la congelación del agua en hielo (Ih). Utilizando avanzadas simulaciones de Monte Carlo, detallaron la transición de los estados líquidos a los sólidos cristalinos.
Área de la Ciencia:
- Química Física es la química física.
- Ciencia de los materiales Ciencia de los materiales.
- Física computacional es la física computacional.
Sus antecedentes:
- La nucleación, la formación de sólidos cristalinos estables a partir de fluidos súper enfriados, es difícil de estudiar de manera experimental y computacional.
- La naturaleza estadística y la existencia transitoria de núcleos críticos conducen a incertidumbres significativas en los datos existentes y en los resultados de las simulaciones.
Objetivo del estudio:
- Proporcionar una observación detallada y cuantitativamente precisa del proceso de nucleación durante la congelación del agua líquida en condiciones ambientales.
- Caracterizar los estados intermedios entre el agua líquida y el hielo (Ih) durante la transición de fase.
Principales métodos:
- Utilizó un método de muestreo no Boltzmann con el enfoque Monte Carlo.
- Se empleó un conjunto de parámetros de orden para caracterizar estadísticamente la cristalinidad del sistema.
- Los estados intermedios analizados durante la transición del agua líquida al hielo (Ih).
Principales resultados:
- Se logró una descripción estadísticamente promedio de las propiedades del sistema durante la congelación.
- Caracterizó el orden del sistema en estados intermedios entre el agua líquida y el hielo (Ih).
- Proporcionó una observación cuantitativa del proceso de nucleación del agua.
Conclusiones:
- El estudio describió con éxito el proceso de nucleación de la congelación del agua en hielo (Ih).
- La metodología empleada ofrece una nueva forma de estudiar las transiciones de fase evasivas.
- Este trabajo mejora la comprensión de la cristalización en sistemas de materia condensada.
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