The Lifshitz-van der Waals acid-base theory assisted fabrication of MFI-containing mixed matrix membranes for gas separations

Sunghwan Park, Eunhee Jang, Heseong An, Wansuk Choi, Jeong Hoon Kim, Jung-hyun Lee, Jungkyu Choi, Jong Suk Lee

Research output: Contribution to journalArticle

Abstract

A zeolite-containing mixed matrix membrane (MMM) is an attractive option to overcome the performance limits of polymeric membranes for large-scale gas separations. The poor interfacial adhesion between zeolites and polymers, however, should be addressed to realize the excellent separation performance of zeolites on large industrial scale. Herein, the interfacial void-free MMMs with incorporation of intact MFI type zeolite particles were successfully prepared by applying the Lifshitz-van der Waals acid-base theory for the selection of the appropriate polymer matrix. Our simple, but systematic approach was based on the adhesion force between MFI particles and a surrounding polymer matrix. The relatively high Lewis basicity of cellulose acetate (CA) leads to highest adhesion force with MFI particles among the tested polymer matrices, suppressing interfacial void formation. In addition, a careful analysis revealed that any residual surfactants on the surface of MFI particles are detrimental to fabricate interfacial void-free MMMs. Single gas (i.e. N2 and NF3) transport in the CA/MFI MMMs were characterized by changing the concentration of MFI particles up to 30 wt%. N2 permeability of CA/MFI MMMs was improved by as much as 304% compared to that of bare CA membranes with maintaining N2/NF3 permselectivity. Furthermore, gas transports in CA/MFI MMMs by varying the size of MFI particles from 0.2 through 0.6 up to 1.5 μm were analyzed by using the Lewis-Nielsen model. Our systematic theory-based guidance can be utilized to offer the appropriate polymer candidates for the zeolite-containing MMMs for high performance gas separations.

Original languageEnglish
Pages (from-to)60-69
Number of pages10
JournalMicroporous and Mesoporous Materials
Volume264
DOIs
Publication statusPublished - 2018 Jul 1

Fingerprint

Zeolites
Cellulose
cellulose
Gases
membranes
Membranes
Fabrication
acids
fabrication
Acids
Polymer matrix
acetates
matrices
gases
Adhesion
polymers
voids
adhesion
Polymers
zeolites

Keywords

  • Gas separations
  • Interfacial void
  • MFI zeolite
  • Mixed matrix membranes
  • The lifshitz-van der waals acid-base theory

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

Cite this

The Lifshitz-van der Waals acid-base theory assisted fabrication of MFI-containing mixed matrix membranes for gas separations. / Park, Sunghwan; Jang, Eunhee; An, Heseong; Choi, Wansuk; Kim, Jeong Hoon; Lee, Jung-hyun; Choi, Jungkyu; Lee, Jong Suk.

In: Microporous and Mesoporous Materials, Vol. 264, 01.07.2018, p. 60-69.

Research output: Contribution to journalArticle

Park, Sunghwan ; Jang, Eunhee ; An, Heseong ; Choi, Wansuk ; Kim, Jeong Hoon ; Lee, Jung-hyun ; Choi, Jungkyu ; Lee, Jong Suk. / The Lifshitz-van der Waals acid-base theory assisted fabrication of MFI-containing mixed matrix membranes for gas separations. In: Microporous and Mesoporous Materials. 2018 ; Vol. 264. pp. 60-69.
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AB - A zeolite-containing mixed matrix membrane (MMM) is an attractive option to overcome the performance limits of polymeric membranes for large-scale gas separations. The poor interfacial adhesion between zeolites and polymers, however, should be addressed to realize the excellent separation performance of zeolites on large industrial scale. Herein, the interfacial void-free MMMs with incorporation of intact MFI type zeolite particles were successfully prepared by applying the Lifshitz-van der Waals acid-base theory for the selection of the appropriate polymer matrix. Our simple, but systematic approach was based on the adhesion force between MFI particles and a surrounding polymer matrix. The relatively high Lewis basicity of cellulose acetate (CA) leads to highest adhesion force with MFI particles among the tested polymer matrices, suppressing interfacial void formation. In addition, a careful analysis revealed that any residual surfactants on the surface of MFI particles are detrimental to fabricate interfacial void-free MMMs. Single gas (i.e. N2 and NF3) transport in the CA/MFI MMMs were characterized by changing the concentration of MFI particles up to 30 wt%. N2 permeability of CA/MFI MMMs was improved by as much as 304% compared to that of bare CA membranes with maintaining N2/NF3 permselectivity. Furthermore, gas transports in CA/MFI MMMs by varying the size of MFI particles from 0.2 through 0.6 up to 1.5 μm were analyzed by using the Lewis-Nielsen model. Our systematic theory-based guidance can be utilized to offer the appropriate polymer candidates for the zeolite-containing MMMs for high performance gas separations.

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