Upgrade project NEAT′2016 at Helmholtz Zentrum Berlin – What can be done on the medium power neutron source

Russina, Margarita; Günther, Gerrit; Grzimek, Veronika; Gainov, Ramil R.; Schlegel, Moritz-Caspar; Drescher, Lars; Kaulich, Toralf; Graf, W.; Urban, B. W.; Daske, Annette; Grotjahn, Kerstin; Hellhammer, R.; Buchert, Guido; Kutz, Heinrich; Rossa, Lutz; Sauer, Olaf-Peter; Fromme, Michael; Wallacher, Dirk; Kiefer, K.; Klemke, Bastian; Grimm, N.P.; Gerischer, S.; Tsapatsaris, Nikolaos; Rolfs, Katharina

doi:10.1016/j.physb.2017.12.026

Cited by 26 publications

(20 citation statements)

References 7 publications

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“…QENS measurements for the hydrogen isotopes in MIL-53(Al) were carried out on the time-of-flight NEAT spectrometer at the neutron source in BER-II, Helmholtz-Zentrum Berlin. [33,34] The QENS spectra were recorded by the NEAT instrument using the incident neutron wavelengths of 2, 6, and 8 Å, affording the FWHM of 100 μeV energy resolution with the momentum transfer range varying from 0.375 to 2.025 Å −1 with a step size of 0.15 Å −1 . Before the QENS measurement, MIL-53(Al) was activated by heating to 400 K with a ramping rate of 1 K min −1 for 13 h to remove moisture and adsorbed gases.…”

Section: Methodsmentioning

confidence: 99%

Elucidation of Diffusivity of Hydrogen Isotopes in Flexible MOFs by Quasi‐Elastic Neutron Scattering

et al. 2021

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porous materials, the diffusion measurements can be used to obtain detailed microgeometric information about porous materials. [7] Therefore, fine control of homogeneously distributed pore size and morphology in porous media is required to understand the fundamental physical adsorption and diffusion processes.Among the various nanoporous materials available, metal-organic frameworks (MOFs) are a promising candidate for investigating the adsorption and diffusion characteristics of gas separation/purification application because of their crystallinity and tunability of the pore structure. To date, however, only a few MOFs have been utilized to investigate the application of diffusivity to gas separation either experimentally (e.g., pulsed-field-gradient (PFG) NMR and quasi-elastic neutron scattering (QENS)) or through molecular dynamic simulations. [8][9][10][11] Stallmach et al. used PFG NMR to study the diffusion of hydrocarbons, such as methane, ethane, n-hexane, and benzene, in MOF-5 and revealed for the first time the diffusivity correlation between the surface area and the pore size. [8] Similarly, Pusch et al. explored CO 2 and CH 4 self-diffusion in ZIF-8 at elevated pressure and found that the former diffuses slightly faster than the latter. They also used QENS to observe the microscopic molecular dynamics in porous frameworks. [9] Using QENS measurements, Rives et al. investigated the dynamics of xylene isomers (m-, o-, and p-xylene) in MIL-47(V) and found that the diffusion increases with the increase in temperature. [10] Russina et al. also reported the Kinetic-quantum-sieving-assisted H 2 :D 2 separation in flexible porous materials is more effective than the currently used energy-intensive cryogenic distillation and girdle-sulfide processes for isotope separation. It is believed that material flexibility results in a pore-breathing phenomenon under the influence of external stimuli, which helps in adjusting the pore size and gives rise to the optimum quantum-sieving phenomenon at each stage of gas separation. However, only a few studies have investigated kinetic-quantumsieving-assisted isotope separation using flexible porous materials. In addition, no reports are available on the microscopic observation of isotopic molecular transportation during the separation process under dynamic transition. Here, the experimental observation of a significantly faster diffusion of deuterium than hydrogen in a flexible pore structure, even at high temperatures, through quasi-elastic neutron scattering, is reported. Unlike rigid structures, the extracted diffusion dynamics of hydrogen isotopes within flexible frameworks show that the diffusion difference between the isotopes increases with an increase in temperature. Owing to this unique inverse trend, a new strategy is suggested for achieving higher operating temperatures for efficient isotope separation utilizing a flexible metal-organic framework system.Molecular diffusion in nanoporous materials for processes such as adsorption, separation, and catalysis is one ...

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Section: Methodsmentioning

confidence: 99%

Elucidation of Diffusivity of Hydrogen Isotopes in Flexible MOFs by Quasi‐Elastic Neutron Scattering

et al. 2021

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“…Elastic scans were performed at the spectrometer NEAT of the Helmholtz Zentrum Berlin, Germany. 21,22 Both IN6 and NEAT are time-of-ight spectrometers using cold neutrons and monochromatic incident beams.…”

Section: Instruments Neat and In6-sharpmentioning

confidence: 99%

Dynamics in hydrated inorganic nanotubes studied by neutron scattering: towards nanoreactors in water

et al. 2021

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“…Comparisons to current state of the art direct time-of-flight instruments at a steady state source, rep-rate multiplication (multiplexing) and inverted time-of-flight are reported in refs. [18], [25], [26], [27], [28], [29].…”

Section: Statistical Chopper and Correlation Spectroscopymentioning

confidence: 99%

Resolution-elastic neutron scattering by correlation techniques

Mezei

Caccamo

Migliardo

et al. 2019

Journal of Advanced Research

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Upgrade project NEAT′2016 at Helmholtz Zentrum Berlin – What can be done on the medium power neutron source

Cited by 26 publications

References 7 publications

Elucidation of Diffusivity of Hydrogen Isotopes in Flexible MOFs by Quasi‐Elastic Neutron Scattering

Elucidation of Diffusivity of Hydrogen Isotopes in Flexible MOFs by Quasi‐Elastic Neutron Scattering

Dynamics in hydrated inorganic nanotubes studied by neutron scattering: towards nanoreactors in water

Resolution-elastic neutron scattering by correlation techniques

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Upgrade project NEAT′2016 at Helmholtz Zentrum Berlin – What can be done on the medium power neutron source

Cited by 26 publications

References 7 publications

Elucidation of Diffusivity of Hydrogen Isotopes in Flexible MOFs by Quasi‐Elastic Neutron Scattering

Elucidation of Diffusivity of Hydrogen Isotopes in Flexible MOFs by Quasi‐Elastic Neutron Scattering

Dynamics in hydrated inorganic nanotubes studied by neutron scattering: towards nanoreactors in water

Resolution-elastic neutron scattering by correlation techniques

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Upgrade project NEAT′2016 at Helmholtz Zentrum Berlin – What can be done on the medium power neutron source