Toward an Understanding of the Microstructure and Interfacial Properties of PIMs/ZIF-8 Mixed Matrix Membranes

Marvin Benzaqui, Rocio Semino, Nicolas Menguy, Florent Carn, Tanay Kundu, Jean-Michel Guigner, Neil B. McKeown, Kadhum J. Msayib, Mariolino Carta, Richard Malpass-Evans, Clement Le Gnillouzer, Guillaume Clet, Naseem A. Ramsahye, Christian Serre, Guillaume Maurin, Nathalie Steunou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A study integrating advanced experimental and modeling tools was undertaken to characterize the microstructural and interfacial properties of mixed matrix membranes (MMMs) composed of the zeolitic imidazolate framework ZIF-8 nanoparticles (NPs) and two polymers of intrinsic microporosity (PIM-1 and PIM-EA-TB). Analysis probed both the initial ZIF-8/PIM-1 colloidal suspensions and the final hybrid membranes. By combination of dynamic light scattering (DLS) and transmission electron microscopy (TEM) analytical and imaging techniques with small-angle X-ray scattering (SAXS), the colloidal suspensions were shown to consist mainly of two distinct kinds of particles, namely, polymer aggregates of about 200 nm in diameter and densely packed ZIF-8-NP aggregates of a few 100 nm in diameter with a 3 nm thick polymer top-layer. Such aggregates are likely to impart the granular texture of ZIF-8/PIMs MMMs as shown by SEM-XEDS analysis. At the molecular scale, modeling studies showed that the surface coverage of ZIF-8 NPs by both polymers appears not to be optimal with the presence of microvoids at the interfaces that indicates only a moderate compatibility between the polymer and ZIF-8. This study shows that the microstructure of MMMs results from a complex interplay between the ZIF-8/PIM compatibility, solvent, surface chemistry of the ZIF-8 NPs, and the physicochemical properties of the polymers such as molecular structure and rigidity.
Original languageEnglish
Pages (from-to)27311-27321
Number of pages11
JournalACS Applied Materials & Interfaces
Volume8
Issue number40
Early online date7 Sep 2016
DOIs
Publication statusE-pub ahead of print - 7 Sep 2016

Keywords

  • MOF/polymer interface
  • mixed matrix membrane
  • transmission electron microscopy
  • molecular modeling
  • polymer of intrinsic microporosity
  • ZIF-8
  • METAL-ORGANIC FRAMEWORKS
  • ZEOLITIC IMIDAZOLATE FRAMEWORK
  • GAS PERMEATION PARAMETERS
  • INTRINSIC MICROPOROSITY
  • CO2 CAPTURE
  • POLYMER
  • SEPARATION
  • TRANSPORT
  • COMPATIBILITY

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