Combining simultaneous reflectance and fluorescence imaging with SEM for conclusive identification of polycrystalline features of MFI membranes

M. A. Snyder, Zhiping Lai, M. Tsapatsis, D. G. Vlachos*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Optical reflectance imaging of dye-saturated, c-oriented MFI membranes is employed for the first time as an in situ technique to conclusively identify the fluorescing features imaged simultaneously through fluorescence confocal optical microscopy (FCOM). For relatively thick (10-25 μm), well-oriented membranes, the reflectance image reveals the crystalline grains at the membrane surface. It provides low-resolution insight reminiscent of SEM, and augments FCOM techniques enabling direct correlation of the fluorescing regions of the membrane with the peripheries of the crystal grains (i.e., grain boundaries). Direct comparison of reflectance, fluorescence, and SEM images of an identical region of the membrane, rather than qualitative comparison of images from different membranes, conclusively confirms that molecular probes (dyes) of maximum diameter greater than the MFI pore dimensions access grain boundaries within the polycrystalline MFI membranes.

Original languageEnglish (US)
Pages (from-to)29-33
Number of pages5
JournalMicroporous and Mesoporous Materials
Volume76
Issue number1-3
DOIs
StatePublished - Dec 1 2004

Keywords

  • Confocal microscopy
  • Grain boundaries
  • Polycrystallinity
  • Reflectance imaging
  • Zeolite membranes

ASJC Scopus subject areas

  • Catalysis
  • Materials Science(all)

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