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| Home > Publications database > The impact of crystal size and temperature on the adsorption-induced flexibility of the Zr-based metal–organic framework DUT-98 > print |
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| 100 | 1 | _ | |a Krause, Simon |0 P:(DE-HGF)0 |b 0 |
| 245 | _ | _ | |a The impact of crystal size and temperature on the adsorption-induced flexibility of the Zr-based metal–organic framework DUT-98 |
| 260 | _ | _ | |a Frankfurt, M. |c 2019 |b Beilstein-Institut zur Förderung der Chemischen Wissenschaften |
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| 520 | _ | _ | |a 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. |
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| 536 | _ | _ | |a DFG project 167917811 - SFB 917: Resistiv schaltende Chalkogenide für zukünftige Elektronikanwendungen: Struktur, Kinetik und Bauelementskalierung "Nanoswitches" (167917811) |0 G:(GEPRIS)167917811 |c 167917811 |x 1 |
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| 700 | 1 | _ | |a Kaskel, Stefan |0 P:(DE-HGF)0 |b 6 |e Corresponding author |
| 773 | _ | _ | |a 10.3762/bjnano.10.169 |g Vol. 10, p. 1737 - 1744 |0 PERI:(DE-600)2583584-1 |p 1737 - 1744 |t Beilstein journal of nanotechnology |v 10 |y 2019 |x 2190-4286 |
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