Transport of dilute organics through dense membranes: Assessing impact on membrane-solute interactions

Sofia C. Fraga; Anna Kujawska; Wojciech Kujawski; Carla Brazinha; João G. Crespo

doi:10.1016/j.memsci.2016.10.013

Transport of dilute organics through dense membranes: Assessing impact on membrane-solute interactions

Sofia C. Fraga, Anna Kujawska, Wojciech Kujawski, Carla Brazinha, João G. Crespo

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Abstract

Polydimethylsiloxane (PDMS) membranes were synthesised by varying the degree of crosslinking and were characterised in a pervaporation system coupled to a mass spectrometry (MS) for on-line monitoring and collecting data points with an interval of 2 s. This monitoring approach allows obtaining very precise information about the impact of solutes’ solubilisation within the membrane and their influence on solvent permeation. Using dilute aqueous solutions of ethyl acetate and hexyl acetate, it is shown how solutes with diverse nature and diverse partitioning into the membrane, determine the transport of solvent and solute by progressively modifying the membrane transport properties. From the evolvement of the time-dependent diffusion coefficients of the selected solutes during transient transport, it is possible to infer about solute-membrane molecular interactions and their impact in terms of membrane rearrangement and fluidification.

Original language	English
Pages (from-to)	346-354
Number of pages	9
Journal	Journal of Membrane Science
Volume	523
DOIs	https://doi.org/10.1016/j.memsci.2016.10.013
Publication status	Published - 1 Feb 2017

Keywords

Mass spectrometry
On-line monitoring
Pervaporation
Solute solubilisation
Time-dependent diffusion coefficients

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10.1016/j.memsci.2016.10.013

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title = "Transport of dilute organics through dense membranes: Assessing impact on membrane-solute interactions",

abstract = "Polydimethylsiloxane (PDMS) membranes were synthesised by varying the degree of crosslinking and were characterised in a pervaporation system coupled to a mass spectrometry (MS) for on-line monitoring and collecting data points with an interval of 2 s. This monitoring approach allows obtaining very precise information about the impact of solutes{\textquoteright} solubilisation within the membrane and their influence on solvent permeation. Using dilute aqueous solutions of ethyl acetate and hexyl acetate, it is shown how solutes with diverse nature and diverse partitioning into the membrane, determine the transport of solvent and solute by progressively modifying the membrane transport properties. From the evolvement of the time-dependent diffusion coefficients of the selected solutes during transient transport, it is possible to infer about solute-membrane molecular interactions and their impact in terms of membrane rearrangement and fluidification.",

keywords = "Mass spectrometry, On-line monitoring, Pervaporation, Solute solubilisation, Time-dependent diffusion coefficients",

author = "Fraga, {Sofia C.} and Anna Kujawska and Wojciech Kujawski and Carla Brazinha and Crespo, {Jo{\~a}o G.}",

note = "The authors would like to acknowledge the Fundacao para a Ciencia e Tecologia, Portugal for the Ph.D grant of Sofia Fraga (SFR/BD/81814/2011) and the Post-Doctoral Fellow Grant of Carla Brazinha (SFR/BD/79533/2011). This work was supported by the grant N N209 761240, funded by National Science Centre Poland. Erasmus LLP mobility grant, which enabled research internship of Anna Kujawska (Rozicka) at the Universidade Nova de Lisboa in Lisbon, Portugal, is also acknowledged.",

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AU - Kujawska, Anna

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AU - Brazinha, Carla

AU - Crespo, João G.

N1 - The authors would like to acknowledge the Fundacao para a Ciencia e Tecologia, Portugal for the Ph.D grant of Sofia Fraga (SFR/BD/81814/2011) and the Post-Doctoral Fellow Grant of Carla Brazinha (SFR/BD/79533/2011). This work was supported by the grant N N209 761240, funded by National Science Centre Poland. Erasmus LLP mobility grant, which enabled research internship of Anna Kujawska (Rozicka) at the Universidade Nova de Lisboa in Lisbon, Portugal, is also acknowledged.

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N2 - Polydimethylsiloxane (PDMS) membranes were synthesised by varying the degree of crosslinking and were characterised in a pervaporation system coupled to a mass spectrometry (MS) for on-line monitoring and collecting data points with an interval of 2 s. This monitoring approach allows obtaining very precise information about the impact of solutes’ solubilisation within the membrane and their influence on solvent permeation. Using dilute aqueous solutions of ethyl acetate and hexyl acetate, it is shown how solutes with diverse nature and diverse partitioning into the membrane, determine the transport of solvent and solute by progressively modifying the membrane transport properties. From the evolvement of the time-dependent diffusion coefficients of the selected solutes during transient transport, it is possible to infer about solute-membrane molecular interactions and their impact in terms of membrane rearrangement and fluidification.

AB - Polydimethylsiloxane (PDMS) membranes were synthesised by varying the degree of crosslinking and were characterised in a pervaporation system coupled to a mass spectrometry (MS) for on-line monitoring and collecting data points with an interval of 2 s. This monitoring approach allows obtaining very precise information about the impact of solutes’ solubilisation within the membrane and their influence on solvent permeation. Using dilute aqueous solutions of ethyl acetate and hexyl acetate, it is shown how solutes with diverse nature and diverse partitioning into the membrane, determine the transport of solvent and solute by progressively modifying the membrane transport properties. From the evolvement of the time-dependent diffusion coefficients of the selected solutes during transient transport, it is possible to infer about solute-membrane molecular interactions and their impact in terms of membrane rearrangement and fluidification.

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KW - Time-dependent diffusion coefficients

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ER -

Transport of dilute organics through dense membranes: Assessing impact on membrane-solute interactions

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