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Functionalization and Dispersion of Carbon Nanomaterials Using an Environmentally Friendly Ultrasonicated Ozonolysis Process
Published on: May 30, 2017
Los tensioactivos iónicos de hidrocarburos oxigenados exhiben solubilidad en CO2.
Xin Fan1, Vijay K Potluri, M Chandler McLeod
1Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA.
Journal of the American Chemical Society
|August 18, 2005
Resumen
Los nuevos tensioactivos iónicos con colas de acetato de vinilo muestran una alta solubilidad en CO2, rivalizando con los tensioactivos fluorados. Estos tensioactivos crean ambientes polares en el CO2, lo que permite la solubilización de moléculas polares como la naranja metila.
Área de la Ciencia:
- Química supramolecular de las moléculas.
- Química verde es la química verde.
Sus antecedentes:
- El desarrollo de surfactantes solubles en CO2 es crucial para los procesos químicos sostenibles.
- Los tensioactivos fluorados ofrecen una alta solubilidad en CO2, pero plantean preocupaciones ambientales.
Objetivo del estudio:
- Para sintetizar y evaluar nuevos tensioactivos iónicos basados en hidrocarburos oxigenados para la solubilidad en CO2.
- Investigar la capacidad de estos tensioactivos para formar micelas inversas en CO2.
Principales métodos:
- Síntesis de tensioactivos iónicos con azúcares acetilados, polipropileno glicol y colas de acetato de vinilo.
- Medición de la solubilidad en CO2 de los tensioactivos a diferentes presiones y temperaturas.
- Análisis espectroscópico (UV-Vis) para sondear el microambiente dentro de soluciones ricas en CO2.
Principales resultados:
- Los tensioactivos a base de acetato de vinilo demostraron una solubilidad significativa en CO2, comparable a las contrapartes fluoradas.
- Un sulfato de sodio con colas oligoméricas de acetato de vinilo mostró una solubilidad del 7 por ciento de peso en CO2.
- Estos tensioactivos formaron con éxito micelas inversas en CO2, indicado por la solubilización metilo naranja y un microambiente polar similar al metanol.
Conclusiones:
- Los surfactantes oligo ((acetato de vinilo) poseen un equilibrio hidrófilo-lipofílico óptimo para aplicaciones CO2-fílicas.
- Estos tensioactivos no fluorados representan una alternativa prometedora para los sistemas de disolventes basados en CO2 y las iniciativas de química verde.
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