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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 0000-0001-9504-8514 |b 0 |e Corresponding author |
| 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 analyse the influence of adsorption cycling, crystal size, and temperature on the switching behaviour of the flexible Zr-based metal-organic framework DUT-98. We observe a shift in the gate opening pressure upon cycling of adsorption experiments of micro meter-sized crystals and assign this to a fragmentation of the crystals. In a series of modulated syntheses we downsize the average crystal size of DUT-98 crystals from 120 µm to 50 nm and characterize the obtained solids by X-ray diffraction, infrared spectroscopy, as well as scanning and transmission electron microscopy. We analyse the adsorption behaviour by nitrogen and water adsorption at 77 K and 298 K, respectively and show that adsorption-induced flexibility is only observed for micro meter-sized crystals. Nanometer-sized crystals were found to exhibit reversible type I adsorption behaviour upon adsorption of nitrogen and exhibit a crystal-size dependent steep water uptake of up to 20 mmol g -1 at 0.5 p / p 0 with potential for water harvesting and heat pump applications. We furthermore investigate the temperature-induced structural transition by in situ PXRD. At temperatures beyond 110 °C the open pore state of nano meter-sized DUT-98 crystals are found to irreversibly transform in 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 into this field. |
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| 700 | 1 | _ | |a Senkovska, Irena |0 0000-0001-7052-1029 |b 5 |
| 700 | 1 | _ | |a Kaskel, Stefan |0 P:(DE-HGF)0 |b 6 |e Corresponding author |
| 773 | _ | _ | |a 10.3762/bxiv.2019.52.v1 |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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