Fine tuning of the metal–organic framework Cu3(BTC)2 HKUST-1 crystal size in the 100 nm to 5 micron range

2012 ◽  
Vol 22 (27) ◽  
pp. 13742 ◽  
Author(s):  
Lik H. Wee ◽  
Martin R. Lohe ◽  
Nikki Janssens ◽  
Stefan Kaskel ◽  
Johan A. Martens
Keyword(s):  
Crystal Size ◽  
Metal Organic Framework ◽  
Fine Tuning ◽  
Metal Organic ◽  
Organic Framework

scholarly journals The impact of crystal size and temperature on the adsorption-induced flexibility of the Zr-based metal–organic framework DUT-98

2019 ◽  
Vol 10 ◽  
pp. 1737-1744 ◽  
Author(s):  
Simon Krause ◽  
Volodymyr Bon ◽  
Hongchu Du ◽  
Rafal E Dunin-Borkowski ◽  
Ulrich Stoeck ◽  
...  
Keyword(s):  
Crystal Size ◽  
Metal Organic Framework ◽  
Adsorption Behavior ◽  
Switching Behavior ◽  
Type I ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic ◽  
The Impact ◽  
Organic Framework

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/p 0 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.

Fine-Tuning a Robust Metal–Organic Framework toward Enhanced Clean Energy Gas Storage

2021 ◽  
Author(s):  
Zhijie Chen ◽  
Mohammad Rasel Mian ◽  
Seung-Joon Lee ◽  
Haoyuan Chen ◽  
Xuan Zhang ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Clean Energy ◽  
Gas Storage ◽  
Fine Tuning ◽  
Metal Organic ◽  
Organic Framework

Fine-tuning metal–organic framework performances by spatially-differentiated postsynthetic modification

2018 ◽  
Vol 6 (10) ◽  
pp. 4260-4265 ◽  
Author(s):  
Hai-Feng Zhang ◽  
Mian Li ◽  
Xue-Zhi Wang ◽  
Dong Luo ◽  
Yi-Fang Zhao ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Fine Tuning ◽  
Size Mismatch ◽  
Postsynthetic Modification ◽  
Selective Functionalization ◽  
Diffusion Controlled ◽  
Metal Organic ◽  
Organic Framework ◽  
Spatially Differentiated

In contrast to the regular postsynthetic modification (PSM) approach which is global and random in principle, a diffusion-controlled PSM strategy utilizing size mismatch between pores and reactants has been developed to target selective functionalization and fine-tuning of material performance.

Reversing C2H2–CO2 adsorption selectivity in an ultramicroporous metal–organic framework platform

2019 ◽  
Vol 55 (76) ◽  
pp. 11354-11357 ◽  
Author(s):  
Hui-Min Wen ◽  
Caijun Liao ◽  
Libo Li ◽  
Ling Yang ◽  
Jing Wang ◽  
...  
Keyword(s):  
Binding Sites ◽  
Co2 Adsorption ◽  
Metal Organic Framework ◽  
Fine Tuning ◽  
Adsorption Selectivity ◽  
Pore Sizes ◽  
Metal Organic ◽  
Co2 Adsorption Selectivity ◽  
At Will ◽  
Organic Framework

Fine-tuning the pore sizes, metrics, and binding sites within a MOF platform can reverse the adsorption selectivity between C2H2 and CO2 at will.

A nanosized metal–organic framework with small pores for kinetic xenon separation

2018 ◽  
Vol 6 (25) ◽  
pp. 11797-11803 ◽  
Author(s):  
Guangli Yu ◽  
Yueqiao Liu ◽  
Xiaoqin Zou ◽  
Nian Zhao ◽  
Huazhen Rong ◽  
...  
Keyword(s):  
Crystal Size ◽  
Metal Organic Framework ◽  
Prepared Material ◽  
Metal Organic ◽  
Organic Framework

The crystal size of CaSDB metal–organic framework has been engineered down to nanoscale by an additive-assisted method. The as-prepared material has exhibited superior xenon capture performance in terms of fast xenon uptake and good selectivity for xenon over krypton.

scholarly journals Hyperpolarized Xe NMR signal advancement by metal-organic framework entrapment in aqueous solution

2020 ◽  
Vol 117 (30) ◽  
pp. 17558-17563
Author(s):  
Qingbin Zeng ◽  
Binglin Bie ◽  
Qianni Guo ◽  
Yaping Yuan ◽  
Qi Han ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Crystal Size ◽  
Chemical Exchange ◽  
Metal Organic Framework ◽  
Chemical Exchange Saturation Transfer ◽  
Application Area ◽  
Saturation Transfer ◽  
Metal Organic ◽  
Organic Framework

We report hyperpolarized Xe signal advancement by metal-organic framework (MOF) entrapment (Hyper-SAME) in aqueous solution. The129Xe NMR signal is drastically promoted by entrapping the Xe into the pores of MOFs. The chemical shift of entrapped129Xe is clearly distinguishable from that of free129Xe in water, due to the surface and pore environment of MOFs. The influences from the crystal size of MOFs and their concentration in water are studied. A zinc imidazole MOF, zeolitic imidazole framework-8 (ZIF-8), with particle size of 110 nm at a concentration of 100 mg/mL, was used to give an NMR signal with intensity four times that of free129Xe in water. Additionally, Hyper-SAME is compatible with hyperpolarized129Xe chemical exchange saturation transfer. The129Xe NMR signal can be amplified further by combining the two techniques. More importantly, Hyper-SAME provides a way to make detection of hyperpolarized129Xe in aqueous solution convenient and broadens the application area of MOFs.

scholarly journals The impact of crystal size and temperature on the adsorption-induced flexibility of the Zr-based metal-organic framework DUT-98

2019 ◽  
Author(s):  
Simon Krause ◽  
Volodymyr Bon ◽  
Hongchu Du ◽  
Rafal E Dunin-Borkowski ◽  
Ulrich Stoeck ◽  
...  
Keyword(s):  
Crystal Size ◽  
Metal Organic Framework ◽  
Type I ◽  
Adsorption Behaviour ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Adsorption Of Nitrogen ◽  
Metal Organic ◽  
The Impact ◽  
Organic Framework

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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