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Modulación del transporte térmico a través de defectos de vacío interfacial en los heteronotubos de carbono/nitruro
Yun Dong1, Hao Cheng1, Yusong Ding2
1School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, China.
Langmuir : the ACS journal of surfaces and colloids
|August 21, 2025
Resumen
Los defectos de vacío en los heteronanotubos de carbono/nitruro de boro reducen significativamente la conductividad térmica interfacial (ITC). Las vacantes de nitrógeno tienen un efecto más fuerte, afectando el transporte de fonones y la localización para la gestión térmica.
Área de la Ciencia:
- Ciencias de los materiales
- Física de la materia condensada
- Nanotecnología
Sus antecedentes:
- La regulación de la transferencia térmica en las heteroestructuras unidimensionales es crítica.
- El impacto de los defectos de vacío en la conductividad térmica interfacial (ITC) no se comprende bien.
Objetivo del estudio:
- Investigar la influencia de los defectos de vacío en el ITC en los heteronanotubos de carbono/nitruro de boro (CBNNT).
- Para aclarar los mecanismos a escala atómica detrás de la modulación de transporte térmico inducida por el defecto.
Principales métodos:
- Los cálculos de los primeros principios para simular los defectos de vacante en CBNNT.
- Análisis espectral de corriente de calor para cuantificar el transporte de fonones.
- Descomposición resuelta por polarización para analizar las contribuciones del modo fonónico.
Principales resultados:
- Los defectos de vacantes reducen significativamente el ITC en CBNNT, con N vacantes que muestran una mayor reducción que las vacantes C.
- Las distorsiones de la red y la reducción de la densidad de los estados de superposición de fonones conducen a una mayor localización de los fonones.
- Los modos de fonones fuera del plano son cruciales para la conducción de calor interfacial y son sensibles a los defectos.
- El aumento de la temperatura mejora la CTI al aumentar la excitación fonónica y la dispersión inelástica.
Conclusiones:
- Los defectos de vacío perjudican críticamente el transporte térmico interfacial en CBNNT.
- La comprensión de las interacciones defecto-fonón es clave para el diseño de materiales avanzados de gestión térmica.
- La temperatura juega un papel vital en la modulación del transporte de calor a través de las interfaces defectuosas.
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