scholarly journals Molecular Diffusion in a Flexible Mesoporous Metal–Organic Framework over the Course of Structural Contraction

2020 ◽  
Vol 11 (22) ◽  
pp. 9696-9701
Author(s):  
Francesco Walenszus ◽  
Volodymyr Bon ◽  
Jack D. Evans ◽  
Stefan Kaskel ◽  
Muslim Dvoyashkin
Keyword(s):  
Molecular Diffusion ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Mesoporous Metal ◽  
Organic Framework

scholarly journals Molecular Diffusion in a Flexible Mesoporous Metal-Organic Framework over the Course of Structural Contraction

2020 ◽  
Author(s):  
Francesco Walenszus ◽  
Volodymyr Bon ◽  
Jack D. Evans ◽  
Stefan Kaskel ◽  
Muslim Dvoyashkin
Keyword(s):  
Molecular Diffusion ◽  
Gas Adsorption ◽  
Metal Organic Framework ◽  
Self Diffusion ◽  
Metal Organic ◽  
Flexible Metal ◽  
Dynamics Simulations ◽  
Pfg Nmr ◽  
Mesoporous Metal ◽  
Organic Framework

In situ <sup>1</sup>H pulsed field gradient (PFG) NMR was used to investigate molecular diffusion of n-butane at 298 K during the negative gas adsorption (NGA) transition caused by contraction of the flexible metal-organic framework DUT-49(Cu). Supported by molecular dynamics simulations, it provided crucial insight to confined diffusion within a highly-flexible pore environment. The self-diffusion coefficients were derived from the experiment and compared with simulations, capturing the diffusion during n-butane adsorption and desorption. This complementary approach has yielded experimental characterization of molecular diffusion mechanisms during the unique process of NGA. <br>

scholarly journals Molecular Diffusion in a Flexible Mesoporous Metal-Organic Framework over the Course of Structural Contraction

2020 ◽  
Author(s):  
Francesco Walenszus ◽  
Volodymyr Bon ◽  
Jack D. Evans ◽  
Stefan Kaskel ◽  
Muslim Dvoyashkin
Keyword(s):  
Molecular Diffusion ◽  
Gas Adsorption ◽  
Metal Organic Framework ◽  
Self Diffusion ◽  
Metal Organic ◽  
Flexible Metal ◽  
Dynamics Simulations ◽  
Pfg Nmr ◽  
Mesoporous Metal ◽  
Organic Framework

In situ <sup>1</sup>H pulsed field gradient (PFG) NMR was used to investigate molecular diffusion of n-butane at 298 K during the negative gas adsorption (NGA) transition caused by contraction of the flexible metal-organic framework DUT-49(Cu). Supported by molecular dynamics simulations, it provided crucial insight to confined diffusion within a highly-flexible pore environment. The self-diffusion coefficients were derived from the experiment and compared with simulations, capturing the diffusion during n-butane adsorption and desorption. This complementary approach has yielded experimental characterization of molecular diffusion mechanisms during the unique process of NGA. <br>

Solvent-Free Powder Synthesis and MOF-CVD Thin Films of the Mesoporous Metal-Organic Framework MAF-6

2019 ◽  
Author(s):  
Timothée Stassin ◽  
Ivo Stassen ◽  
Joao Marreiros ◽  
Alexander John Cruz ◽  
Rhea Verbeke ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Metal Organic Framework ◽  
Chemical Vapor ◽  
Uptake Capacity ◽  
Powder Synthesis ◽  
Crystalline Films ◽  
Metal Organic ◽  
Mesoporous Metal ◽  
First Time ◽  
Organic Framework

A simple solvent- and catalyst-free method is presented for the synthesis of the mesoporous metal-organic framework (MOF) MAF-6 (RHO-Zn(eIm)2) based on the reaction of ZnO with 2-ethylimidazole vapor at temperatures ≤ 100 °C. By translating this method to a chemical vapor deposition (CVD) protocol, mesoporous crystalline films could be deposited for the first time entirely from the vapor phase. A combination of PALS and Kr physisorption measurements confirmed the porosity of these MOF-CVD films and the size of the MAF-6 supercages (diam. ~2 nm), in close agreement with powder data and calculations. MAF-6 powders and films were further characterized by XRD, TGA, SEM, FTIR, PDF and EXAFS. The exceptional uptake capacity of the mesoporous MAF-6 in comparison to the microporous ZIF-8 is demonstrated by vapor-phase loading of a molecule larger than the ZIF-8 windows.

scholarly journals Highly Efficient Adsorption of Aqueous Pb(II) with Mesoporous Metal-Organic Framework-5: An Equilibrium and Kinetic Study

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
José María Rivera ◽  
Susana Rincón ◽  
Cherif Ben Youssef ◽  
Alejandro Zepeda
Keyword(s):  
Kinetic Study ◽  
Photoelectron Spectroscopy ◽  
Metal Organic Framework ◽  
Isotherm Models ◽  
Ionic Exchange ◽  
Order Kinetic ◽  
X Ray ◽  
Metal Organic ◽  
Mesoporous Metal ◽  
Organic Framework

Mesoporous metal-organic framework-5 (MOF-5), with the composition Zn4O(BDC)3, showed a high capacity for the adsorptive removal of Pb(II) from 100% aqueous media. After the adsorption process, changes in both morphology and composition were detected using a scanning electron microscope (SEM) equipped with an energy dispersive X-ray (EDX) system, Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) analysis. The experimental evidence showed that Zn(II) liberation from MOF-5 structure was provoked by the water effect demonstrating that Pb(II) removal is not due to ionic exchange with Zn. A kinetic study showed that Pb(II) removal was carried out in 30 min with a behavior of pseudo-second-order kinetic model. The experimental data on Pb(II) adsorption were adequately fit by both the Langmuir and BET isotherm models with maximum adsorption capacities of 658.5 and 412.7 mg/g, respectively, at pH 5 and 45°C. The results of this work demonstrate that the use of MOF-5 has great potential for applications in environmental protection, especially regarding the removal of the lead present in industrial wastewaters and tap waters.

scholarly journals Buffered Coordination Modulation as a Means of Controlling Crystal Morphology and Molecular Diffusion in an Anisotropic Metal–Organic Framework

2021 ◽  
Vol 143 (13) ◽  
pp. 5044-5052
Author(s):  
Kristen A. Colwell ◽  
Megan N. Jackson ◽  
Rodolfo M. Torres-Gavosto ◽  
Sudi Jawahery ◽  
Bess Vlaisavljevich ◽  
...  
Keyword(s):  
Crystal Morphology ◽  
Molecular Diffusion ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Anisotropic Metal ◽  
Organic Framework

Mesoporous metal–organic framework MIL-100(Fe) as drug carrier

Adsorption ◽  
2021 ◽  
Author(s):  
Paulo G. M. Mileo ◽  
Diony N. Gomes ◽  
Daniel V. Gonçalves ◽  
Sebastião M. P. Lucena
Keyword(s):  
Metal Organic Framework ◽  
Drug Carrier ◽  
Metal Organic ◽  
Mesoporous Metal ◽  
Organic Framework

Stepwise adsorption in a mesoporous metal–organic framework: experimental and computational analysis

2012 ◽  
Vol 48 (27) ◽  
pp. 3297 ◽  
Author(s):  
Daqiang Yuan ◽  
Rachel B. Getman ◽  
Zhangwen Wei ◽  
Randall Q. Snurr ◽  
Hong-Cai Zhou
Keyword(s):  
Computational Analysis ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Mesoporous Metal ◽  
Organic Framework
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