Search Results - "Kärger, Jörg"

Transport Phenomena in Nanoporous Materials by Karger, Jörg

“…Diffusion, that is, the irregular movement of atoms and molecules, is a universal phenomenon of mass transfer occurring in all states of matter. It is of equal…”
Get full text

NMR Studies of the Dehydroxylation and Rehydroxylation (RHX) of Clays with Respect to the RHX Dating of Ceramic Materials by Avramovska, Marija, Freude, Dieter, Schwieger, Wilhelm, Song, Chen, Kärger, Jörg, Haase, Jürgen

“…Monitoring the recombination of OH groups in a ceramic sample after firing, also known as rehydroxylation (RHX), was proposed as a way to determine the time…”
Get full text

Structural analysis of hierarchically organized zeolites by Mitchell, Sharon, Pinar, Ana B., Kenvin, Jeffrey, Crivelli, Paolo, Kärger, Jörg, Pérez-Ramírez, Javier

“…Hierarchically organized zeolites are materials retaining the crystalline order and associated functionality of bulk zeolites while also integrating a…”
Get full text

Diffusion anomaly in nanopores as a rich field for theorists and a challenge for experimentalists by Brandani, Stefano, Hwang, Seungtaik, Kärger, Jörg, Mangano, Enzo

Get full text

Surface barriers and symmetry of adsorption and desorption processes by Sastre, German, Kärger, Jörg, Ruthven, Douglas M.

“…Adsorption and desorption of hydrocarbons in a realistic model (2496 atoms) of ZSM-5 zeolite (MFI), including an external surface and a reservoir for…”
Get full text

Molecular Dynamics Study of Diffusion and Surface Permeation of Benzene in Silicalite by Sastre, German, Kärger, Jörg, Ruthven, Douglas M

“…Molecular dynamics simulations have been carried out to determine the uptake and release rates for benzene in an idealized crystal of silicalite (the pure…”
Get full text

From computer design to gas separation by Caro, Jürgen, Kärger, Jörg

“…The presence of one-dimensional MEL intergrowths in two-dimensional MDI zeolite nanosheets, inferred from experimental and theoretical analysis, allows for…”
Get full text

The Nature of Surface Barriers on Nanoporous Solids Explored by Microimaging of Transient Guest Distributions by Hibbe, Florian, Chmelik, Christian, Heinke, Lars, Pramanik, Sanhita, Li, Jing, Ruthven, Douglas M, Tzoulaki, Despina, Kärger, Jörg

“…Nanoporous solids are attractive materials for energetically efficient and environmentally friendly catalytic and adsorption separation processes. Although the…”
Get full text

NMR Studies of the Rehydroxylation of Ceramic Materials with Respect to Rehydroxylation Dating by Avramovska, Marija, Freude, Dieter, Schwieger, Wilhelm, Fey, Tobias, Kärger, Jörg, Haase, Jürgen

“…Monitoring the rehydroxylation (RHX) in ceramic samples after firing was introduced in archeology as the RHX dating in order to determine the time elapsed…”
Get full text

Diffusion in nanopores: correlating experimental findings with “first-principles” predictions by Hwang, Seungtaik, Kärger, Jörg

“…Measurement of molecular diffusion in nanoporous host materials, which are typically inhomogeneous and anisotropic, often involves an intricate web of factors…”
Get full text

Microimaging of transient guest profiles to monitor mass transfer in nanoporous materials by Kärger, Jörg, Binder, Tomas, Chmelik, Christian, Hibbe, Florian, Krautscheid, Harald, Krishna, Rajamani, Weitkamp, Jens

“…Microimaging techniques, such as interference and infrared microscopy, can be used as a tool to directly monitor guest profiles within nanoporous materials…”
Get full text

Pulsed field gradient NMR diffusion measurement in nanoporous materials by Kärger, Jörg, Avramovska, Marija, Freude, Dieter, Haase, Jürgen, Hwang, Seungtaik, Valiullin, Rustem

“…Labeling in diffusion measurements by pulsed field gradient (PFG) NMR is based on the observation of the phase of nuclear spins acquired in a constant magnetic…”
Get full text

Diffusion Path Reversibility Confirms Symmetry of Surface Barriers by Sastre, German, Kärger, Jörg, Ruthven, Douglas M

“…The mass transfer resistance encountered by guest molecules entering or leaving a microporous host material (the “surface barrier”) is often comparable with or…”
Get full text

Diffusion in nanopores: inspecting the grounds by Kärger, Jörg, Ruthven, Douglas M., Valiullin, Rustem

“…This paper provides a general overview of the phenomenon of guest diffusion in nanoporous materials. It introduces the different types of diffusion measurement…”
Get full text

Single‐Molecule and Ensemble Diffusivities in Individual Nanopores with Spatially Dependent Mobility by Rybka, Julia, Kärger, Jörg, Tallarek, Ulrich

“…We investigated single‐molecule and ensemble diffusivities in a silica nanopore with a chemically modified surface by molecular dynamics simulations. Solutes…”
Get full text

Uncommon Synergy between Adsorption and Diffusion of Hexane Isomer Mixtures in MFI Zeolite Induced by Configurational Entropy Effects by Titze, Tobias, Chmelik, Christian, Kärger, Jörg, van Baten, Jasper M, Krishna, Rajamani

“…While n-hexane (nC6) can adsorb at any location within the MFI zeolite pore network, configurational considerations cause the branched isomer 2-methylpentane…”
Get full text

Martin Bülow: response by Ruthven, Douglas M., Kärger, Jörg, Brandani, Stefano, Mangano, Enzo

Get full text

Quantifying Diffusion‐limited Catalytic Reactions in Hierarchically Structured Porous Materials by Combining Kinetic Monte Carlo Simulations with the Two‐region Model of Diffusion by Hwang, Seungtaik, Schneider, Daniel, Haase, Jürgen, Miersemann, Erich, Kärger, Jörg

“…The use of hierarchically organized nanoporous materials has proven to be well suited for counteracting transport hindrance in micropores and the resulting…”
Get full text

Transport in Nanoporous Materials Including MOFs: The Applicability of Fick's Laws by Titze, Tobias, Lauerer, Alexander, Heinke, Lars, Chmelik, Christian, Zimmermann, Nils E. R., Keil, Frerich J., Ruthven, Douglas M., Kärger, Jörg

“…Diffusion in nanoporous host–guest systems is often considered to be too complicated to comply with such “simple” relationships as Fick’s first and second law…”
Get full text

Sorption kinetics: measurement of surface resistance by Ruthven, Douglas M., Kärger, Jörg, Brandani, Stefano, Mangano, Enzo

“…The problem of measuring sorption kinetics in microporous adsorbents and distinguishing experimentally between surface resistance and internal diffusion is…”
Get full text