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Single-Molecule Fluorescence Microscopy Reveals Local Diffusion Coefficients in the Pore Network of an Individual Catalyst Particle
journal contribution
posted on 2017-09-13, 18:43 authored by Frank
C. Hendriks, Florian Meirer, Alexey V. Kubarev, Zoran Ristanović, Maarten B. J. Roeffaers, Eelco T. C. Vogt, Pieter C. A. Bruijnincx, Bert M. WeckhuysenWe
used single-molecule fluorescence microscopy to study self-diffusion
of a feedstock-like probe molecule with nanometer accuracy in the
macropores of a micrometer-sized, real-life fluid catalytic cracking
(FCC) particle. Movies of single fluorescent molecules allowed their
movement through the pore network to be reconstructed. The observed
tracks were classified into three different states by machine learning
and all found to be distributed homogeneously over the particle. Most
probe molecules (88%) were immobile, with the molecule most likely
being physisorbed or trapped; the remainder was either mobile (8%),
with the molecule moving inside the macropores, or showed hybrid behavior
(4%). Mobile tracks had an average diffusion coefficient of D = 8 × 10–14 ± 1 × 10–13 m2 s–1, with the standard
deviation thought to be related to the large range of pore sizes found
in FCC particles. The developed methodology can be used to evaluate,
quantify and map heterogeneities in diffusional properties within
complex hierarchically porous materials.
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study self-diffusiondiffusional propertiesmacroporepore sizesPore Networkmap heterogeneitiesSingle-Molecule Fluorescence MicroscopyFCC particlesLocal Diffusion Coefficientspore networkfeedstock-like probe moleculeIndividual Catalyst Particlenanometer accuracysingle-molecule fluorescence microscopydiffusion coefficient
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