Single-Molecule Fluorescence Microscopy Reveals Local Diffusion Coefficients in the Pore Network of an Individual Catalyst Particle
| Autor: | Hendriks, Frank, Meirer, Florian, Kubarev, Alexey V., Ristanovic, Zoran, Roeffaers, Maarten B J, Vogt, Eelco T. C., Bruijnincx, Pieter C. A., Weckhuysen, Bert M., Sub Inorganic Chemistry and Catalysis, Inorganic Chemistry and Catalysis |
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| Přispěvatelé: | Sub Inorganic Chemistry and Catalysis, Inorganic Chemistry and Catalysis |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Macropore
Chemistry Communication Analytical chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Single-molecule experiment 01 natural sciences Biochemistry Fluorescence Catalysis 0104 chemical sciences Colloid and Surface Chemistry Chemical physics Microscopy Molecule Particle Nanometre Diffusion (business) 0210 nano-technology |
| Zdroj: | Journal of the American Chemical Society, 139. American Chemical Society Journal of the American Chemical Society |
| ISSN: | 0002-7863 |
| DOI: | 10.1021/jacs.7b07139 |
| Popis: | We 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. ispartof: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY vol:139 issue:39 pages:13632-13635 ispartof: location:United States status: published |
| Databáze: | OpenAIRE |
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