This title appears in the Scientific Report :
2020
Please use the identifier:
http://hdl.handle.net/2128/25453 in citations.
Please use the identifier: http://dx.doi.org/10.3762/bjnano.10.169 in citations.
The impact of crystal size and temperature on the adsorption-induced flexibility of the Zr-based metal–organic framework DUT-98
The impact of crystal size and temperature on the adsorption-induced flexibility of the Zr-based metal–organic framework DUT-98
In this contribution we analyze the influence of adsorption cycling, crystal size, and temperature on the switching behavior of the flexible Zr-based metal–organic framework DUT-98. We observe a shift in the gate-opening pressure upon cycling of adsorption experiments for micrometer-sized crystals a...
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Personal Name(s): | Krause, Simon |
---|---|
Bon, Volodymyr / Du, Hongchu / Dunin-Borkowski, Rafal E / Stoeck, Ulrich / Senkovska, Irena / Kaskel, Stefan (Corresponding author) | |
Contributing Institute: |
Materialwissenschaft u. Werkstofftechnik; ER-C-2 Physik Nanoskaliger Systeme; ER-C-1 |
Published in: | Beilstein journal of nanotechnology, 10 (2019) S. 1737 - 1744 |
Imprint: |
Frankfurt, M.
Beilstein-Institut zur Förderung der Chemischen Wissenschaften
2019
|
DOI: |
10.3762/bjnano.10.169 |
PubMed ID: |
31501745 |
Document Type: |
Journal Article |
Research Program: |
Grundlagen der Ionentransportprozesse in resistiv schaltenden Oxiden (B03) Controlling Configuration-Based Phenomena |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.3762/bjnano.10.169 in citations.
In this contribution we analyze the influence of adsorption cycling, crystal size, and temperature on the switching behavior of the flexible Zr-based metal–organic framework DUT-98. We observe a shift in the gate-opening pressure upon cycling of adsorption experiments for micrometer-sized crystals and assign this to a fragmentation of the crystals. In a series of samples, the average crystal size of DUT-98 crystals was varied from 120 µm to 50 nm and the obtained solids were characterized by X-ray diffraction, infrared spectroscopy, as well as scanning and transmission electron microscopy. We analyzed the adsorption behavior by nitrogen and water adsorption at 77 K and 298 K, respectively, and show that adsorption-induced flexibility is only observed for micrometer-sized crystals. Nanometer-sized crystals were found to exhibit reversible type I adsorption behavior upon adsorption of nitrogen and exhibit a crystal-size-dependent steep water uptake of up to 20 mmol g−1 at 0.5 p/p0 with potential for water harvesting and heat pump applications. We furthermore investigate the temperature-induced structural transition by in situ powder X-ray diffraction. At temperatures beyond 110 °C, the open-pore state of the nanometer-sized DUT-98 crystals is found to irreversibly transform to a closed-pore state. The connection of crystal fragmentation upon adsorption cycling and the crystal size dependence of the adsorption-induced flexibility is an important finding for evaluation of these materials in future adsorption-based applications. This work thus extends the limited amount of studies on crystal size effects in flexible MOFs and hopefully motivates further investigations in this field. |