n-Hexane induced swelling of thin PDMS films under non-equilibrium nanofiltration permeation conditions, resolved by spectroscopic ellipsometry

Wojciech Ogieglo, J.C.A. van der Werf, Kristianne Tempelman, Herbert Wormeester, Matthias Wessling, Arian Nijmeijer, Nieck Edwin Benes

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Abstract

A nondestructivetechniqueispresentedforin-situanalysisofsolventinducedmembraneswelling.The techniqueisbasedonspectroscopicellipsometry(SE)andallowssimultaneousmeasurementof membranefilmthicknessandsolventsorption.Theattainableexperimentalconditionsareonlylimited by thetestcell(r473.15 K, r20 MPa)andbyfarexceedthoseencounteredintypicalsolventresistant nanofiltration(SRNF)applications.Theinfluenceofcross-linkerconcentrationonswellingofthinfilms and bulksamplesofpoly(dimethylsiloxane)(PDMS)isresolvedandinteractionparametersaccording to Flory–HugginsandFlory–Rehnertheoriesarecalculated.Itisfoundthatduetoconfinementonthe supportforthethinsupportedfilmsacorrectionforelasticdeformationofthenetworkisnecessary.In the pressurizedswollenfilmthethicknessandrefractiveindexarefoundtobeindependentofpressure in therangeof0.1–10MPasuggestingthatthemolarvolumesofthepenetrantintheliquidandsorbed phasesarenotsignificantlydifferent.Whenapressuredifferenceoverthemembraneisappliedandthe solventisallowedtopermeate,aprogressingreductioninthicknessofthemembraneisobservedwith increasingupstreampressure.Thederivedconcentrationsofn-hexaneattheinterfacebetweenthin film andsupport,atthepermeateside,areinexcellentagreementwithvaluescalculatedusingthe solution–diffusionmodel.Thisimpliesthatin-situspectroscopicellipsometryallowsquantificationof the contributionofsolution–diffusiontomixedmodetransport,forinstanceoccurringsimultaneously with pore-flowandtransportthroughdefects,incompositemembranes.
Original languageEnglish
Pages (from-to)233-243
Number of pages11
JournalJournal of membrane science
Volume431
DOIs
Publication statusPublished - 2013

Keywords

  • METIS-296583
  • IR-86902

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