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CO(2) in Lyotropic Liquid Crystals: Phase Equilibria Behavior and Rheology

The CO(2) absorption of liquid crystalline phases of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (Pluronic L92, (EO)(8)(PO)(47)(EO)(8)), monoethanolamine (MEA), and water, with a composition of 60% L92/10% MEA/30% water has been investigated to assess potential use in carbon capt...

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Detalles Bibliográficos
Autores principales: Rodríguez-Fabià, Sandra, Norrman, Jens, Knuutila, Hanna K., Sjöblom, Johan, Paso, Kristofer
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6419203/
https://www.ncbi.nlm.nih.gov/pubmed/30960293
http://dx.doi.org/10.3390/polym11020309
Descripción
Sumario:The CO(2) absorption of liquid crystalline phases of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (Pluronic L92, (EO)(8)(PO)(47)(EO)(8)), monoethanolamine (MEA), and water, with a composition of 60% L92/10% MEA/30% water has been investigated to assess potential use in carbon capture and storage applications. Vapor–liquid equilibrium data of the liquid crystalline system with CO(2) was recorded up to a CO(2) partial pressure of 6 bar, where a loading of 38.6 g CO(2)/kg sample was obtained. Moreover, the phase transitions occurring during the loading process were investigated by small angle X-ray scattering (SAXS), presenting a transition from lamellar + hexagonal phase to hexagonal (at 25 °C). In addition, the rheology of samples with varying loadings was also studied, showing that the viscosity increases with increasing CO(2)-loading until the phase transition to hexagonal phase is completed. Finally, thermal stability experiments were performed, and revealed that L92 does not contribute to MEA degradation.