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El crecimiento anisotrópico de las nanopartículas de plata está controlado cinéticamente por la unión de
Zhifeng Chen1, Ji Woong Chang1,2, Choumini Balasanthiran1
1Department of Chemical Engineering , Pennsylvania State University , University Park , Pennsylvania 16802 , United States.
Journal of the American Chemical Society
|January 19, 2019
Resumen
La polivinilpirrolidona (PVP) influye en la forma de las nanopartículas de plata (Ag NP), pero el control termodinámico es poco probable. Este estudio muestra la adsorción de PVP en las facetas Ag100 y Ag111, lo que sugiere que el control cinético es más importante para la forma de AgNP.
Área de la Ciencia:
- Ciencias de los materiales
- Nanotecnología
- Química Física
Sus antecedentes:
- La polivinilpirrolidona (PVP) se usa comúnmente para sintetizar nanopartículas de plata (Ag NPs) con formas controladas, a menudo en cubos.
- El mecanismo exacto que rige este control de la forma no se entiende completamente.
- Se cree ampliamente que el PVP se une preferentemente a las facetas Ag100 sobre las facetas Ag111, lo que lleva al control termodinámico.
Objetivo del estudio:
- Investigar el mecanismo de control de la forma en la síntesis de Ag NP por PVP.
- Para determinar la termodinámica de la adsorción de PVP en diferentes facetas de plata (Ag100 y Ag111)
- Evaluar el papel del control termodinámico frente al cinético en la configuración de Ag NP mediada por PVP.
Principales métodos:
- Medición de las isotermas de adsorción de PVP en varias formas de Ag NP.
- Determinación de las constantes de adsorción de equilibrio para PVP en las facetas Ag{100} y Ag{111}.
- Aplicación de la construcción de Wulff para analizar las implicaciones termodinámicas de los datos de adsorción.
Principales resultados:
- Se encontró que la constante de adsorción de equilibrio de PVP era independiente del peso molecular de PVP.
- La adsorción mostró sólo una débil dependencia de la forma de NP y, por consiguiente, de la faceta Ag.
- La constante de adsorción para PVP en Ag11 (M−1) fue aproximadamente la mitad de la de Ag100 (M−1).
Conclusiones:
- La diferencia observada en la adsorción de PVP entre las facetas Ag100 y Ag111 es insuficiente para explicar la prevalencia de AgNP cúbicos a través del control termodinámico.
- Estos hallazgos sugieren fuertemente que el control cinético, en lugar del control termodinámico, juega un papel importante en la formación de nanopartículas de Ag utilizando PVP.
- El estudio destaca la importancia de considerar los factores cinéticos en la síntesis y el diseño de nanopartículas.
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