Zobrazeno 1 - 10
of 224
pro vyhledávání: '"Siegfried Stapf"'
Publikováno v:
Magnetic Resonance Letters, Vol 3, Iss 3, Pp 220-231 (2023)
In reservoir rocks, the term “ageing” refers to extended exposition to crude oil; a typically water-wet sandstone will then gradually become oil-wet as a consequence of the deposition of insoluble fractions of oil onto the surface grains. Rocks h
Externí odkaz:
https://doaj.org/article/a2720d0dcc8d4e7990255f0c86b8ae20
Publikováno v:
Magnetic Resonance Letters, Vol 3, Iss 3, Pp 256-265 (2023)
Determining the dynamics of adsorbed liquids on nanoporous materials is crucial for a detailed understanding of interactions and processes on the solid-liquid interface in many materials and porous systems. Knowledge of the influence of the presence
Externí odkaz:
https://doaj.org/article/4105824156a14b5084665f496c99ddf4
Autor:
Siegfried Stapf, Niklas Siebert, Timo Spalek, Vincent Hartmann, Bulat Gizatullin, Carlos Mattea
Publikováno v:
Magnetic Resonance Letters, Vol 3, Iss 2, Pp 108-117 (2023)
Relaxation and diffusion measurements were carried out on single and binary liquids filling the pore space of controlled porous glass Vycor with an average pore size of about 4 nm. The dispersion of the longitudinal relaxation time T1 is discussed as
Externí odkaz:
https://doaj.org/article/253b56d307154e7a8f0a1f74b7669e2c
Publikováno v:
PLoS ONE, Vol 16, Iss 8, p e0256177 (2021)
Osteoarthritis (OA) as the main degenerative disease of articular cartilage in joints is accompanied by structural and compositional changes in the tissue. Degeneration is a consequence of a reduction of the amount of macromolecules, the so-called pr
Externí odkaz:
https://doaj.org/article/818ec6e728c34bd2bfa9056f55f7587e
Publikováno v:
Molecules, Vol 26, Iss 17, p 5218 (2021)
The distribution of NMR relaxation times and diffusion coefficients in crude oils results from the vast number of different chemical species. In addition, the presence of asphaltenes provides different relaxation environments for the maltenes, genera
Externí odkaz:
https://doaj.org/article/5d18cd83f66f47769b8ae0d32a8b95c1
Publikováno v:
Molecules, Vol 25, Iss 8, p 1762 (2020)
The present work systematically investigates the influence of silica fume and organosilane addition on the hydration dynamics and the capillary pore formation of a cement paste. The cement samples were prepared with two water-to-cement ratios with in
Externí odkaz:
https://doaj.org/article/c52a16e454c64c98a3ff3b09281eac0c
Publikováno v:
Molecules, Vol 25, Iss 5, p 1227 (2020)
The formation of a rigid porous biopolymer scaffold from aqueous samples of 1% w/v (suspension) and 5% w/v (gel) corn starch was studied using optical and nuclear magnetic resonance (NMR) techniques. The drying process of these systems was observed u
Externí odkaz:
https://doaj.org/article/8a42f2ae70af4cdcb41311e69f0fe730
Autor:
Jenna Poonoosamy, Sabina Haber-Pohlmeier, Hang Deng, Guido Deissmann, Martina Klinkenberg, Bulat Gizatullin, Siegfried Stapf, Felix Brandt, Dirk Bosbach, Andreas Pohlmeier
Publikováno v:
Minerals, Vol 10, Iss 3, p 226 (2020)
The understanding of the dissolution and precipitation of minerals and its impact on the transport of fluids in porous media is essential for various subsurface applications, including shale gas production using hydraulic fracturing (“fracking”),
Externí odkaz:
https://doaj.org/article/bc7091f9582e4eb898a343fb04ba8b32
Autor:
Simon Gravelle, Sabina Haber-Pohlmeier, Carlos Mattea, Siegfried Stapf, Christian Holm, Alexander Schlaich
Publikováno v:
Langmuir.
The evaporation of water from a bare soil is often accompanied by the formation of a layer of crystallized salt, a process that must be understood in order to address the issue of soil salinisation. Here, we use nuclear magnetic relaxation dispersion
Publikováno v:
Physical Chemistry Chemical Physics. 24:27004-27008
Dynamic nuclear polarization is a versatile approach to increasing the sensitivity of NMR measurements and is achieved by any of four different mechanisms which dominate for either liquids or solids, depending on temperature and radical density. In t