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Comportamiento de Fase de Invierno Urbano Contaminado y Limpio PM_2.5 de Observaciones Ópticas y Modelado de

Tien Van Do¹, Andreas Zuend², Na Rae Choi³

¹Department of Earth and Environment Sciences, Jeonbuk National University, Jeonju-si, Jeollabuk-do 54896, Republic of Korea.

Environmental science & technology

|February 9, 2026

Resumen

El estado de fase de las partículas finas (PM$_{2.5}$) impacta en la química atmosférica. Este estudio revela comportamientos de fase complejos y dependientes de la humedad en los aerosoles urbanos, que influyen en su reactividad.

Área de la Ciencia:

Química de la atmósfera La química de la atmósfera
Ciencias ambientales Ciencias ambientales.
Química Física es la química física.

Sus antecedentes:

El estado de fase de las partículas finas (PM$_{2.5}$) es crucial para comprender la química atmosférica.
Las restricciones del mundo real sobre el comportamiento de la fase PM$_{2.5}$ siguen siendo poco comprendidas.

Objetivo del estudio:

Para investigar el comportamiento de fase de las PM urbanas bajo condiciones ambientales.
Para determinar cómo la humedad y la composición afectan a las transiciones de fase PM$_{2.5}$.

Principales métodos:

Microscopía óptica combinada, experimentos de empuje y flujo y modelado termodinámico.
Analizó las PM$_{2.5}$ urbanas invernales recogidas en Ansan, Corea del Sur.

Principales resultados:

Se observaron transiciones de fase dependientes de la humedad y la composición, incluidos los estados líquido-líquido y líquido-líquido-sólido.
Los aerosoles ricos en nitrato mostraron un comportamiento similar al líquido cerca del equilibrio.
Los aerosoles ricos en orgánicos exhibieron una mayor viscosidad y desviaciones del equilibrio.

Conclusiones:

El ambiente PM$_{2.5}$ muestra una complejidad de fase significativa.
El estado de fase de las partículas influye críticamente en el comportamiento termodinámico y la reactividad atmosférica.
La humedad relativa y la composición son moduladores clave del comportamiento de la fase PM$_{2.5}$.

Palabras clave:

contenido de agua líquida en el aerosol.Composición química La composición química es la composición química de las sustancias.Modelado de equilibrio en el modelo de equilibrio.El estado de fase del estado de fase.PM2.5 urbano en las ciudades.

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