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Insights into Free Volume Variations across Ion-Exchange Membranes upon Mixed Solvents Uptake by Small and Ultrasmall Angle Neutron Scattering
journal contribution
posted on 2017-03-15, 00:00 authored by Francois-Marie Jacques Allioux, C J Garvey, C Rehm, B L Tardy, R R Dagastine, Peter HodgsonPeter Hodgson, Lingxue KongLingxue Kong, Ludovic DumeeIon-exchange membranes are composite separation materials increasingly used in a variety of electro-membranes and electrochemical processes. Although promising for solvent reclamation, to date, their main applications are limited to aqueous environments due to physicochemical and microstructural changes of the materials upon exposure to nonaqueous and mixed solvents solutions, affecting long-term stability and separation performance. In the present work, the structural changes of commercial and novel hybrid ion-exchange membranes in mixed methanol/water and ethanol/water solutions are assessed for the first time using ultra- and small-angle neutron scattering techniques. The interface between the ion-exchange functional layer and the mechanical support of the membranes is evaluated in the ultralow-q region, while a broad solvent-dependent peak at the mid-q region was correlated to the microstructural properties which are related to the free volume across the ion-exchange domains and to the materials electrical and nanoscale mechanical properties. The results of this study may offer new opportunities toward the development of an efficient separation process using ion-exchange membranes for the purification of fermentation broths toward biofuel generation.
History
Journal
ACS Applied Materials and InterfacesVolume
9Issue
10Pagination
8704 - 8713Publisher DOI
ISSN
1944-8244eISSN
1944-8252Publication classification
C1 Refereed article in a scholarly journalCopyright notice
2017, American Chemical SocietyUsage metrics
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No categories selectedKeywords
Science & TechnologyTechnologyNanoscience & NanotechnologyMaterials Science, MultidisciplinaryScience & Technology - Other TopicsMaterials Sciencesmall-angle neutron scatteringelectrodialysision-exchange membranesionic clusters swellingliquid AFM nanoindentationMETHANOLNANOINDENTATIONMICROSTRUCTURECONDUCTIVITYINSTRUMENTIONOMERSDRY
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