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Organización selectiva del tamaño de los nanocristales entálpicos compatibilizados en mezclas ternaras de
Michael R Bockstaller1, Yonit Lapetnikov, Shlomo Margel
1Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
Journal of the American Chemical Society
|May 2, 2003
Resumen
El tamaño de las partículas dicta la disposición de las nanopartículas en las mezclas de copolímero de bloque. Los sistemas ternales con dos tamaños de nanocristales permiten la organización selectiva de tamaño en matrices y hojas.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- La ciencia de los polímeros es la ciencia de los polímeros.
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- Los copolímeros de bloque se autoensamblan en nanoestructuras ordenadas.
- Las nanopartículas se pueden incorporar en matrices de copolímero de bloque.
- El control de la organización de las nanopartículas es crucial para las propiedades avanzadas de los materiales.
Objetivo del estudio:
- Para investigar la influencia del tamaño del núcleo de partículas en la topología de las nanopartículas en mezclas de bloques de copolímero/nanocristal.
- Explorar el comportamiento de autoensamblaje de sistemas ternaros que contienen copolímeros de bloque y dos tamaños de nanocristales distintos.
- Para determinar si se puede lograr la separación selectiva por tamaño y la organización de los nanocristales.
Principales métodos:
- Síntesis de mezclas de bloque de copolímero y nanocristal.
- Caracterización de la morfología de la mezcla utilizando técnicas como la microscopía electrónica de transmisión (TEM).
- Análisis de la localización y distribución de nanopartículas dentro de la matriz de copolímero de bloque.
Principales resultados:
- Se identificaron dos topologías de nanopartículas distintas basadas en el tamaño relativo del núcleo de partículas: localización en la superficie divisoria intermaterial o dentro del centro del dominio del polímero.
- En sistemas ternales con dos especies de nanocristales de diferentes tamaños, estos distintos tipos morfológicos fueron conservados.
- Se logró la separación autónoma de tamaño selectivo y la organización de nanocristales en matrices y láminas alternas.
Conclusiones:
- El tamaño del núcleo de partículas es un parámetro crítico que controla la disposición de las nanopartículas en las mezclas de copolímero de bloque.
- Los sistemas de copolímero / nanocristal de bloque ternario ofrecen una vía para la organización precisa y selectiva del tamaño de múltiples especies de nanopartículas.
- Esta organización controlada permite la creación de nanoestructuras complejas con aplicaciones potenciales en materiales avanzados.
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