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El transporte molecular electromodulado en membranas de nanotubos de oro
Sang Bok Lee1, Charles R Martin
1Department of Chemistry, Center for Research at the Bio/Nano Interface, University of Florida, Gainesville, FL 32611-7200, USA.
Journal of the American Chemical Society
|October 3, 2002
Resumen
Los investigadores crearon membranas sintéticas con nanotubos de oro para el transporte controlado de moléculas. La aplicación de potenciales eléctricos conmuta reversiblemente la membrana.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Nanotecnología La nanotecnología es la nanotecnología.
- La electroquímica es electroquímica.
Sus antecedentes:
- Las membranas sintéticas permiten el transporte controlado.
- Los nanotubos de oro ofrecen conductos a nanoescala.
- La electromodulación del transporte es un área emergente.
Objetivo del estudio:
- Desarrollar un método para electromodular el transporte de moléculas neutras a través de membranas sintéticas.
- Para utilizar los nanotubos de oro para el transporte molecular sintonizable.
- Para investigar el papel de los tensioactivos aniónicos en el control de las propiedades de la membrana.
Principales métodos:
- Fabricación de membranas sintéticas incrustadas con nanotubos de oro (Au) de monodispersión (diámetro interno <1 nm).
- Aplicación de potenciales eléctricos a la membrana del nanotubo Au.
- Utilizando un tensioactivo aniónico para alterar la hidrofobidad de los nanotubos.
- Monitoreo del transporte de moléculas hidrofóbicas neutras a través de la membrana.
Principales resultados:
- Los nanotubos de oro proporcionan conductos para el transporte de moléculas e iones.
- La adsorción de surfactante aniónico, inducida por el potencial positivo, hace que el interior de los nanotubos sea hidrofóbico.
- El transporte de moléculas hidrofóbicas se mejora cuando los nanotubos son hidrofóbicos.
- El potencial negativo expulsa el tensioactivo, restaurando un estado más hidrófilo y modulando el transporte.
Conclusiones:
- Se ha demostrado un nuevo método para la electromodulación reversible del transporte de moléculas neutras utilizando membranas de nanotubos Au.
- El sistema permite un control sintonizable sobre el paso de moléculas hidrofóbicas por medios eléctricos.
- Esta tecnología tiene potencial para aplicaciones en sistemas de separación, detección y liberación controlada.
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