Logo TU Ilmenau

Technische Physik II /

headerphoto Fachgebiet 
Technische Physik II /

Prof. Dr. Siegfried Stapf


Telefon 03677 69-3671

E-Mail senden

Ihre Position




(150) A. Lozovoi, L. Petrova, C. Mattea, S. Stapf, E. Rössler, N. Fatkullin, On the theory of the proton dipolar-correlation effect as a method for investigation of segmental displacement in polymer melts, J. Chem. Phys., 147, 074904/1-9 (2017).

(149) B. Gizatullin, O. Neudert, S. Stapf, C. Mattea, Dynamic nuclear polarization fast field cycling method for selective study of molecular dynamics in block copolymers, Chem. Phys. Chem., 18, 2347-2356 (2017).

(148)  A. Ordikhani-Seyedlar, J. P. de Almeida Martins, P. J. Sebastião, M.J. Jardim Beira, S. Stapf, F. Vaca Chavez, C. Mattea, Dynamics of binary mixtures of ionic liquids and ethanol by NMR,  Magn. Reson. Chem., in press

(147) O. Neudert, C. Mattea, S. Stapf, Application of CPMG acquisition in fast field-cycling relaxometry, Microporous  Mesoporous Mater, in press

 (146) A. Lozovoi, C. Mattea, M. Hofmann, K. Saalwächter, N. Fatkullin, S. Stapf, Segmental dynamics of polyethylene-alt-propylene studied by NMR spin echo techniques, J. Chem. Phys., 146, 224901 (2017).

(145) A. Ordikhani-Seyedlar, S. Stapf, C. Mattea, Cation dynamics in supercooled and solid alkyl methylimidazolium bromide ionic liquids, J. Phys. Chem. B, 121, 5363-5373 (2017).

(144) O.V. Petrov, E. Rössler, C. Mattea, M.T. Nieminen, P. Lehenkari, S. Karhula, S. Saarakkala, S. Stapf, Low-Field NMR Relaxation Times Distributions and Their Magnetic Field Dependence as a Possible Biomarker in Cartilage, IFMBE Proceedings, 65 (2017).

(143) O.V. Petrov, S. Stapf, Parameterization of NMR relaxation curves in terms of logarithmic moments of the relaxation time distribution, J. Magn. Reson. 279, 39-48 (2017).

(142) E. Rößler, C. Mattea, S. Saarakkala, P. Lehenkari, M. Finnilä, L. Rieppo, S. Karhula, M.T. Nieminen, S. Stapf, Correlations of low-field NMR and variable-field NMR parameters with osteoarthritis in human articular cartilage under load, NMR in Biomedicine, in press

(141) E. Rößler, C. Mattea, S. Stapf, S. Karhula, S. Saarakkala, M. T. Nieminen, Load-dependent NMR low-field profiling and relaxation dispersion study of osteoarthritic articular cartilage, Microporous Mesoporous Mater., (2017) DOI 10.1016/j.micromeso.2017.02.069.

(140) B. V. N. Phani Kumar, C. Mattea, S. Stapf & R. Dabrowski, Influence of underlying local organisations in typical nematic phase of 6CHBT and induced nematic phase of bicomponent liquid crystalline systems 4DBT–12CB – a Fast Field Cycling NMR investigation, Liquid Crystals, 44, 1494-1505 (2017)

(139) O. Neudert, C. Mattea, S. Stapf, Molecular dynamics-based selectivity for Fast-Field-Cycling relaxometry by Overhauser and solid effect dynamic nuclear polarization, J. Magn. Reson. 276, 113 (2017).

(138) C. Lenk, C. Mattea, S. Stapf, J. M. Köhler, Optimising sodium silica gel for Ferroin immobilization, J. Porous Mater., 24, 923 (2017)



(137) J. Sun, M. Chen, H. Wang, B. Jiang, C. Mattea, S. Stapf, J. Wang, Z. Liao, Y. Yang, PFG-NMR measurement of self-diffusion coefficients of long-chain alpha-olefins and their mixture in semicrystalline polyethylene, J. Appl. Polym. Sci. 133, 44143/1-8 (2016). DOI: 10.1002/app.44143

(136) O. Neudert, C. Mattea, S. Stapf, A compact X-Band resonator for DNP-enhanced Fast-Field-Cycling NMR. J Magn. Reson.  271, 7 (2016).

(135) E. Silletta, M. Velasco, C. Gomez, M. Strumia, S. Stapf, C. Mattea, G. Monti, R. Acosta. Enhanced surface interaction of water confined in hierarchical porous polymers induced by hydrogen bonding. Langmuir 32, 7427 (2016)

(134) A. Lozovoi, C. Mattea, A. Herrmann, E. Roßler, S. Stapf, N. Fatkullin. Proton NMR dipolar-correlation effect as a method for investigating segmental diffusion in polymer melts. J. Chem. Phys. (Communication) 144, 241101 (2016)

(133) A. Ordikhani-Seyedlar, O. Neudert, S. Stapf, C. Mattea, R. Kausik, D. E. Freed, Y.-Q. Song, M. D. Hürlimann. Evidence of aromaticity-specific maltene NMR relaxation enhancement promoted by semi-immobilised radicals. Energy & Fuels 30, 3886-3893 (2016)

(132) Y. Gossuin, T. Orlando, M. Basini, D. Henrard, A. Lascialfari, C. Mattea, S. Stapf, Q. Vuong
NMR relaxation induced by iron oxide particles: testing theoretical models
Nanotechnology 27, 155706/1-11 (2016)

(131) F. Bajd, C. Mattea, S. Stapf, I. Sersa
Diffussion tensor MR microscopy of tissues with low diffusional snisotropy
Radiology & Oncology, 50, 175 (2016)

(130) M. Velasco, E. Silletta, C. Gomez, M. Strumia, S. Stapf, G. Monti, C. Mattea, and R. Acosta
Spatially Resolved Monitoring of Drying of Hierarchical Porous Organic Networks
Langmuir 32, 2067-2074 (2016).



(129) M. Bukharov, V. Shtyrlin, G. Mamin, S. Stapf, C. Mattea, A. Mukhtarov, N. Serov, E. Gilyazetdinov, Structure and Dynamics of Solvation Shells of Copper(II) Complexes with N,O-Containing Ligands, Inorg. Chem., 54, 9777 (2015).

(128) Q. Zhang, J. Wang, B. Jiang, Y. Yang, Y. Zhou, S. Stapf, C. Mattea, Q. Gong, Particle motion in two- and three-phase fluidized bed reactors determined by PFG NMR, Chem. Eng. Technol. 38, 1269-1276 (2015).

(127) M. Chen, B. Jiang, J. Wang, Y. Yang, S. Stapf, C. Mattea, Q. Gong, Investigation of the extraction process in gel-spinning technology of UHMWPE fibers by low-field NMR, J. Appl. Poly. Sci., 132, 42018 (2015).

(126)  A. Ordikhani-Seyedlar, S. Stapf, C. Mattea, Dynamics of the Ionic Liquid 1-Butyl-3-Methylimidazolium Bis(Trifluoromethylsulphonyl)imide studied by Nuclear Magnetic Resonance Dispersion and Diffusion, Phys. Chem. Chem. Phys., 17, 1653 (2015).

(125) E. Rössler, C. Mattea, S. Stapf, Feasibility of high-resolution one-dimensional relaxation imaging at low magnetic field using a single-sided NMR scanner applied to articular cartilage, J. Magn. Reson., 251, 43 (2015).

(124) M. Contreras, C. Mattea, J. Rueda, S. Stapf, F. Bajd, Synthesis and Characterization of Block Copolymers from 2-Oxazolines, Designed Monomers and Polymers, 18, 170-179 (2015).

(123) S. Stapf, A. Ordikhani-Seyedlar, C. Mattea, R. Kausik, D. E. Freed, Y.-Q. Song, M. D. Hürlimann, Fluorine tracers for the identification of molecular interaction with porous asphaltene aggregates in crude oil, Microporous Mesoporous Mater., 205, 56-60 (2015).

(122) O. Neudert, C. Mattea, S. Stapf, M. Reh, H.W. Spieß, K. Münnemann, Fast-Field-Cycling Relaxometry enhanced by Dynamic Nuclear Polarization, Microporous Mesoporous Mater., 205, 70-74 (2015).

(121) E. Rössler, C. Mattea, S. Stapf, NMRD investigations of enzymatically degraded bovine articular cartilage. Magn. Reson. Medicine, 73, 2005-2014 (2015).



(120) S. Haber-Pohlmeier, S. Stapf, A. Pohlmeier, NMR fast field cycling relaxometry of unsaturated soils, Appl. Magn. Reson. 45, 1099-1115 (2014).

(119) C. Badea, A. Pop, C. Mattea, S. Stapf, I. Ardelean, The effect of curing temperature on early hydration of gray cement via fast field cycling-NMR relaxometry, Appl. Magn. Reson., 45, 1299 (2014).

(118) N. Fatkullin, S. Stapf, M. Hofmann, R. Meier, E.A. Rössler, Proton spin dynamics in polymer melts: new perspectives for experimental investigations of polymer dynamics, J. Non-Cryst. Solids, 407, 309 (2014).

(117) J. Stepisnik, A. Mohoric, C. Mattea, S. Stapf and I. Sersa, Velocity autocorrelation spectra in molten polymer measured by NMR modulated gradient spin-echo. E. Phys. Lett., 106, 27007 (2014).

(116) M. Bukharov, V. Shtyrlin, A.Mukhtarov, G. Mamin, S. Stapf, C. Mattea, A. Krutikov, A.N Il'in and N. Serov. Structural and dynamic characteristics of copper(II) amino acid complexes in solutions by combined EPR and NMR relaxation methods. Phys. Chem. Chem. Phys., 16, 9411 (2014).

(115) S. Stapf , A. Ordikhani-Seyedlar , N. Ryan , C. Mattea , R. Kausik , D. Freed , Y.-Q. Song and M. Hurlimann. Probing maltene-asphaltene interaction in crude oil by means of NMR relaxation. Energy & Fuels, 28, 2395–2401 (2014).

(114) O. Neudert, H.-P. Raich, C. Mattea, S. Stapf, K. Münnemann. An Alderman-Grant resonator for S-Band Dynamic Nuclear Polarization. J. Magn. Reson. 242, 79 (2014).

(113) S. Ghoshal, S. Stapf and C. Mattea. Protein renaturation in the gelatin film formation process. Appl. Magn. Reson., 45, 145 (2014).

(112) B. Jiang, Y. Yang, L. Du, C. Mattea, J. Wang, S. Stapf and Y. Yang. Solvent diffusion in silica/poly[styrene-co-(acrylic acid)] core-shell microspheres by pulsed field gradient NMR techniques, Journal of Applied Polymer Science, 131, 40160 (2014).



(111) N. Fatkullin, C. Mattea, S. Stapf. On the theory of Double Quantum NMR in polymer systems: the second cumulant approximation for many spin I=1/2 systems, J. Chem. Phys. 139, 194905 (2013).

(110) O. Neudert, C. Mattea, H. W. Spiess, S. Stapf, K. Münnemann. Comparative study of 1H and 19F Overhauser DNP in fluorinated benzenes, Physical Chemistry Chemical Physics,15,  20717 (2013).

(109) E. Rössler, S. Stapf, N. Fatkullin. Recent NMR investigations on molecular dynamics of polymer melts in bulk and in confinement, Current Opinion in Colloid & Interface Science, 18, 173 (2013).

(108) B. Jiang, Y. Yang, L.J. Du, J.D. Wang, Y.R. Yang, S. Stapf. Advanced catalyst technology for broad/bimodal polyethylene, achieved by polymer-coated particles supporting hybrid catalyst. Ind. Eng. Chem. Res., 52, 2501 (2013).

(107) M. Raue, A. Bernet, M. Küppers, S. Stapf, H.-W. Schmidt, B. Blümich, T. Mang, Sodium NMR relaxation – a versatile non-invasive tool for the monitoring of phase transitions and the estimation of effective pore sizes of supramolecular hydrogels. Prog. Colloid Polymer Sci., 140, 45 (2013).

(106) M. Raue, J. Martins, M. Küppers, T. Mang, B. Blümich, S. Stapf. Visualization of hydrogel shrinkage due to ion replacement by 27Al and 23Na magnetic resonance imaging. Prog. Colloid Polymer Sci., 140, 35 (2013).

(105) C. Mattea, S. Ghoshal, E. Pabianczyk and S. Stapf, Poly(vinyl alcohol)Film Formation Process Using Single-Sided Low-Field NMR Relaxometry: Effect of Initial Concentration, Microporous & Mesoporous Materials, 178, 27, (2013).

(104) S. Muncaci, C. Mattea, S. Stapf, and I. Ardelean, Frequency-dependent NMR relaxation of liquids confined inside porous media containing an increased amount of magnetic impurities, Magn. Reson. Chem. 51, 123 (2013).



(103) N. Fatkullin, A. Gubaidullin, C. Mattea, and S. Stapf, On the theory of the proton free induction decay and Hahn echo in polymer systems: The role of intermolecular magnetic dipole-dipole interactions and the modified Anderson–Weiss approximation, J. Chem. Phys. 137, 224097 (2012).

(102) S. Ghoshal, C. Mattea, L. Du, and S. Stapf, Concentration and Humidity Effect on Gelatin Films Studied by NMR, Z. Phys. Chem. 226, 1259 (2012), DOI 10.1524/zpch.2012.0310

(101) Q. Vuong, S. Van Doorslaer, J.-L. Bridot, C. Argante, G. Alejandro, R. Hermann, S. Disch, C. Mattea, S. Stapf, Y. Gossuin, Paramagnetic nanoparticles as potential MRI contrast agents: characterization, NMR relaxation, simulations and theory.Magn. Reson. Mater. Phys. Biol. Med. (MAGMA) , in Press (2012).

(100) T. Shakirov, N. Fatkullin, S. Stapf, P. Khalatur, R. Kimmich, Computer simulation of polymer dynamics under confinement in straight cylindrical tubes: cooperativity and onset of the corset effect, Polym. Sci  A, in press.

(99) S. Ahola, V. Telkkia, S. Stapf, Velocity distributions in a micromixer measured by NMR imaging, Lab on a Chip (DOI: 10.1039/c2lc21214e).

(98) S. Ghoshal, P. Denner, S. Stapf, C. Mattea, Study of the Formation of Poly(vinyl alcohol) Films, Macromolecules 45, 1913 (2012).



(97) R. Nechifor, I. Ardelean, C. Mattea, S. Stapf, M. Bogdan, NMR relaxation dispersion of Miglyol molecules confined inside polymeric microcapsules, Magn. Reson. Chem.  49, 730 (2011).

(96) S. Ghoshal, P. Denner, S. Stapf, C. Mattea, Structural and dynamical heterogeneities in PVA films induced by evaporation during the formation process, Chem. Phys. Lett., 515, 231 (2011).

(95) E. Roessler, C. Mattea, A. Mollova, S. Stapf, Low-field one-dimensional and direction-dependent relaxation imaging of bovine articular cartilage J. Magn. Reson., 213, 112 (2011).

(94) L. Stingaciu, L. Weihermüller, A. Pohlmeier, S. Stapf, H. Vereecken, Determination of soil hydraulic properties using magnetic resonance techniques and classical soil physics measurements, AIP Conf. Proc. 1330, 77 (2011).

(93) L. Buljubasich, B. Blümich, S. Stapf, Monitoring mass transport in heterogeneously catalyzed reactions by field-gradient NMR for assessing reaction efficiency in a single pellet, J. Magn. Reson., 212, 47 (2011).

(92) N. Fatkullin, C. Mattea, S. Stapf, A simple scaling derivation of the shear thinning power law exponent in entangled polymer melts, Polymer, 52, 3522 (2011).

(91) O. Neudert, S. Stapf, C. Mattea, Molecular exchange of n-hexane in zeolite sieves studied by diffusion-diffusion and T1-diffusion NMR exchange spectroscopy, New J. of Physics, 13, 035018 (2011).

(90) X. Shi, J. Wang, B. Jiang, Y. Yang, C. Mattea, S. Stapf, Effects of thermo-oxidative aging on chain mobility, phase composition and mechanical behaviour of high density polyethylene, Polymer Engineering & Science51, 2171 (2011).

(89) A. Omrani, A. Mollova, C. Mattea, S. Stapf, Relaxation times and in situ kinetic analysis during network evolution of epoxy via a Nickel catalyst of Imidazole Polymer Testing, Thermochimica Acta, 516, 52 (2011).

(88) O. Neudert, S. Stapf, C. Mattea, Diffusion exchange NMR spectroscopy in inhomgeneous magnetic fields, J. Magn. Reson. 208, 256 (2011).



(87) S. Ghoshal, C. Mattea, P. Denner, S. Stapf, Heterogeneities in gelatin film formation using single-sided NMR, J. Phys. Chem. B, 114, 16356 (2010).

(86) L. Buljubasich, B. Blümich, S. Stapf, Quantification of H2O2 Concentrations in Aqueous Solutions by means of combined NMR and pH Measurements, Phys. Chem. Chem. Phys., 12, 13166 (2010).

(85) N. Fatkullin, A. Gubaidullin, S. Stapf, Features of polymer chain dynamics as revealed by intermolecular nuclear magnetic dipole-dipole interaction: model calculations and field-cycling NMR relaxometry, J. Chem. Phys. 132, 094903/1-17 (2010).

(84) S. Haber-Pohlmeier, S. Stapf, A. Pohlmeier, Water flow monitored by tracer transport in natural porous media using MRI, Vadose Zone J. 9, 835 (2010).

(83) S. Haber-Pohlmeier, S. Stapf, D. van Dusschoten, A. Pohlmeier, Relaxation in a natural soil: comparison of relaxometric imaging, T1-T2 correlation and fast-field cycling NMR, The Open Magn. Reson. J. 3, 57-62 (2010).

(82) S. Ghoshal, C. Mattea, S. Stapf, Inhomogeneity in the drying process of gelatine film formation. NMR microscopy and relaxation study, Chem. Phys. Lett. 485, 343-347 (2010).

(81) L. R. Stingaciu, L. Weihermüller, S. Haber-Pohlmeier, S. Stapf, H. Vereecken, A. Pohlmeier, Determination of pore size distribution and hydraulic properties from Nuclear Magnetic resonance (NMR) relaxometry: a comparison study of laboratory methods, Water Res. Res. 46, W 11510 (2010).

(80) L. Buljubasich, B. Blümich, S. Stapf, Reaction Monitoring of Hydrogen Peroxide decomposition by NMR Relaxometry, Chem. Eng. Sci. 65, 1394-1399 (2010).



(79) S. Ayalur-Karunakaran, B. Blümich, S. Stapf, Chain dynamics of a weakly adsorbing polymer in thin films, Langmuir 25, 12208-12216 (2009).

(78) L. Buljubasich, B. Blümich, S. Stapf, Investigation of the heterogeneous catalytic decomposition of H2O2, AIP Conf. Proc. 1081, 67-70 (2008).

(77) L. R. Stingaciu, A. Pohlmeier, D. van Dusschoten, L. Weihermüller, P. Blümler, S. Stapf, H. Vereecken, Investigation of unsaturated porous media by high-field and low-field NMR relaxometry, Water Res. Res. 45, W08412 (2009).

(76) A. Pohlmeier, S. Haber-Pohlmeier, S. Stapf, A Fast field cycling NMR relaxometry study of natural soils, Vadose Zone J. 8, 735-742 (2009).



(75) S. Ayalur-Karunakaran, B. Blümich, S. Stapf, NMR investigations of polymer dynamics in a partially filled porous matrix, Eur. Phys. J. E 26, 43-54 (2008).

(74) X.W. Yan, X.H. Ren, S. Stapf, J.D. Wang, Y.R. Yang, Self-diffusion coefficients of organic solvents in linear and branched high density polyethylene particles measured by PFG NMR, Chin. Chem. Lett. 19, 110-114 (2008).

(73) D. Papadopoulos, M.A. Voda, S. Stapf, F. Casanova, M. Behr, B. Blümich, Magnetic field simulations in support of interdiffusion quantification with NMR, Chem. Eng. Sci. 63, 4694-4703 (2008).



(72) X.W. Yan, J.D. Wang, X.H.Ren, Y.R. Yang, B.B. Jiang, M.A. Voda, M. Bertmer, S. Stapf, Phase structures of nascent polyethylene powderstudied by wideline proton NMR,  Chin. J. Chem. 25, 863-868 (2007).

(71) B. Blümich, L. B. Datsevich, A. Jess, T. Oehmichen, X. Ren, S. Stapf, Chaos in catalyst pores – can we use it for process development?  Chem. Eng. J. 134, 35-44 (2007).



(70) S. Ahola, J. Perlo, F. Casanova, S. Stapf, B. Blümich, Multiecho sequence for velocity-imaging in inhomogeneous rf fields, J. Magn. Reson. 182, 143-151 (2006).

(69) J. Zhou, Y.R. Yang, X.H. Ren, S. Stapf, Investigation of reinforcement of the modified carbon black from wasted tires by nuclear magnetic resonance, J. Zhejiang Univ Science A 7, 1440-1446 (2006).

(68) S. Ahola, F. Casanova, J. Perlo, K. Münnemann, B. Blümich, S. Stapf, Monitoring of fluid motion in a micromixer by dynamic NMR microscopy, Lab on a Chip 6, 90-95 (2006).

(67) S. Harms, S. Stapf, B. Blümich, Application of k-space and q-space encoding NMR techniques on granular media in a 3D model fluidised bed reactor, J. Magn. Reson. 178, 308-317 (2006). 

(66) E. Groß-Hardt, A. Amar, S. Stapf, A. Pfennig, B. Blümich: Flow Dynamics Inside a Single Levitated Droplet, Ind. Eng. Chem. Res. 45, 416-423 (2006).   

(65) T. Merzliak, I. Bartusseck, S. Stapf, M. A. Voda, B. Blümich, A. Pfennig: Description of Intra-Diffusion in Liquid Mixtures, Fluid Phase Equilibria 245, 158-167 (2006).



(64) S. Stapf, S. Kariyo, Dependence of order and dynamics in polymers and elastomers under deformation revealed by NMR techniques, Acta Phys. Pol. A 108, 247-259 (2005).

(63) A. Amar, E. Groß-Hardt, A. A. Khrapitchev, S. Stapf, A. Pfennig, B. Blümich, Visualizing Flow Vortices Inside a Single Levitated Drop, J. Magn. Reson. 177, 74-85 (2005).

(62) A. Amar, S. Stapf, B. Blümich, Internal fluid dynamics in levitated drops by fast Magnetic Resonance Velocimetry, Phys. Rev.E 72, 030201 (2005).

(61) X. Ren, S. Stapf, B. Blümich, Magnetic resonance visualisation of flow and pore structure in packed beds with low aspect ratio, Chem. Eng. Technol. 28, 219-225 (2005).

(60) S. Kariyo, S. Stapf, B. Blümich, Restricted molecular dynamics of polymer chains by means of NMR field cycling relaxometry, Macromol. Chem. Phys. 206, 1300-1310 (2005).

(59) S. Kariyo, S. Stapf, Site-specific proton and deuteron NMR relaxation dispersion in selectively deuterated polyisoprene, Macromol. Chem. Phys. 206, 1292-1299 (2005).

(58) S. Stapf, X. Ren, E. Talnishnikh, B. Blümich, Spatial distribution of coke residues in porous catalyst pellets analyzed by field-cycling relaxometry and parameter imaging, Magn. Reson. Imaging, 23, 383-386 (2005).

(57) S. Kariyo, M. Küppers, M. Badiger, A. Prabhakar, B. Jagadeesh, S. Stapf, B. Blümich, Morphology and chain dynamics during collapse transition of PNIPAM gels studied by combined imaging, relaxometry, and 129Xe spectroscopy techniques, Magn. Reson. Imaging, 23, 249-253 (2005).



(56) D. Tang, A. Jess, X. Ren, B. Blümich, S. Stapf, Axial dispersion and wall effects in narrow fixed bed reactors – a comparative study based on RTD- and NMR-measurements, Chem. Eng.Technol. 27, 866-873 (2004).

(55) Z. Fojud, E. Szczesniak, S. Jurga, S. Stapf, R. Kimmich, Molecular dynamics of n-dodecylammonium chloride in aqueous solutions investigated by 2H NMR and 1H NMR relaxometry, Solid State Nucl. Magn. Reson. 25, 200-206 (2004).

(54) S. Kariyo, S. Stapf, NMR relaxation dispersion of vulcanized natural rubber, Solid State Nucl. Magn. Reson. 25, 64-71 (2004).

(53) B. Doumèche, M. Küppers, S. Stapf, B. Blümich, W. Hartmeier, M. B. Ansorge-Schumacher, New approaches to the visualisation, quantification and explanation of acid-induced water loss from Ca-alginate hydrogel beads, J. Microencapsulation 21, 565-573 (2004).

(52) X.-H. Ren, S. Stapf, B. Blümich, Nuclear magnetic resonance velocity imaging and velocity distribution measurements for flow in model fixed-bed reactors of low tube-to-particle diameter ratio,  AIChE J. 51, 392-405 (2005). 


(51) S. Kariyo, S. Stapf, Influence of cross-link density and deformation on the NMR relaxation dispersion of natural rubber, Macromolecules 35, 9253-9255 (2002).

(50) X.-H. Ren, S. Stapf, H. Kühn, D. E. Demco, B. Blümich, Molecular mobility in fixed-bed reactors investigated by multiscale NMR techniques,  Magn. Reson. Imaging 21, 261-268 (2003).

(49) A. A. Khrapitchev, S. Han, S. Stapf, B. Blümich, Spectrally Resolved Velocity Exchange Spectroscopy of Two-Phase Flow,  J. Magn. Reson. 159, 36-45 (2002).

(48) A. A. Khrapitchev, S. Stapf, P. T. Callaghan, NMR visualisation of displacement correlations for flow in porous media,  Phys. Rev. E 66, 051203/1-16 (2002).

(47) S. Stapf, NMR investigations of correlations between longitudinal and transverse displacements in flow through random structured media, Chem. Phys. 284, 369-388 (2002).

(46) M. Küppers, C. Heine, S. Han, S. Stapf, B. Blümich, In-situ observation of diffusion and reaction dynamics in gel microreactors by chemically resolved NMR microscopy, Appl. Magn. Reson. 22, 235-246 (2002).

(45) C. Heine, S. Stapf, B. Blümich, Two- and three-dimensional waves in falling-film flow in the non-laminar flow regime – an NMR study, Appl. Magn. Reson. 22, 223-233 (2002).

(44) S. Stapf, S. Han, C. Heine, B. Blümich, Spatio-temporal correlations in transport processes determined by multi-PFG experiments, Concepts Magn. Reson. 14, 172-211 (2002).

(43) R. Savelsberg, D. E. Demco, B. Blümich, S. Stapf, Particle motion in gas-fluidized granular systems by pulsed-field gradient nuclear magnetic resonance,  Phys. Rev. E 65, 020301(R)/1-4 (2002).

(42) X.-H. Ren, M. Bertmer, S. Stapf, D. E. Demco, B. Blümich, C. Kern, A. Jess,  Deactivation and regeneration of a naphtha reforming catalyst, Applied Catalysis A 228, 39-52 (2002).

(41) A. A. Khrapitchev, S. Stapf, P. T. Callaghan, Dispersion in porous bead packs studied by velocity exchange spectroscopy, NATO Science Series II: Mathematics, Physics and Chemistry, Vol. 76, 553-558 (2002).

(40) X. H. Ren, M. Bertmer, H. Kühn, S. Stapf, D. E. Demco, B. Blümich, C. Kern, A. Jess, 1H, 13C and 129Xe NMR study of changing pore size and tortuosity during deactivation and decoking of a naphtha reforming catalyst, NATO Science Series II: Mathematics, Physics and Chemistry, Vol. 76, 603-608 (2002).

(39) S. Han, S. Stapf, B. Blümich, Catching a falling drop by NMR: correlation of position and velocity, NATO Science Series II: Mathematics, Physics and Chemistry, Vol. 76, 327-336 (2002).

(38) B. Blümich, S. Han, C. Heine, R. Eymael, M. Bertmer, S. Stapf, Analysis of slow motion by multidimensional NMR, NATO Science Series II: Mathematics, Physics and Chemistry, Vol. 76, 3-14 (2002).

(37) S. Stapf, C. Heine, S. Han, B. Blümich, Spatio-temporal correlations in gravity-driven and pressure-driven fluid transport processes, NATO Science Series II: Mathematics, Physics and Chemistry, Vol. 76, 423-432 (2002).

(36) C. Heine, K. Kupferschläger, S. Stapf, B. Blümich, NMR velocimetry of falling liquid films,  J. Magn. Reson. 154, 311-316 (2002).


(35) S. Han, S. Stapf, B. Blümich, NMR imaging of falling water drops,  Phys. Rev. Lett. 87, 144501/1-4 (2001).

(34) B. Blümich, P. T. Callaghan, R. A. Damion, S. Han, A. A. Khrapitchev, K. J. Packer, S. Stapf,  Two-dimensional NMR of velocity exchange: VEXSY and SERPENT,  J. Magn. Reson. 152, 162-167 (2001).

(33) S. Stapf, Determination of velocity autocorrelation functions by multiple data acquisition in NMR pulsed-field gradient experiments, J. Magn. Reson. 152, 308-312 (2001).

(32) S. Stapf, B. Blümich, Multi-gradient pulse investigations of fluid transport in porous media,  Magn. Reson. Imaging 19, 385-389 (2001).


(31) B. Blümich, D. E. Demco, S. Stapf, U. Görke, C. Chwatinski, L. Gasper, R. Giesen, R. Haken, S. Han,  Functional NMR imaging of materials,  Polymeric Materials Science and Engineering  82, 148 (2000).

(30) S. Han, S. Stapf, B. Blümich, Two-dimensional PFG NMR for encoding correlations of position, velocity and acceleration in fluid transport,  J. Magn. Reson. 146, 169-180 (2000).

(29) M. I. Menzel, S. Han, S. Stapf, B. Blümich,  NMR characterization of the pore structure and anisotropic self-diffusion in salt water ice,  J. Magn. Reson. 143, 376-381 (2000).

(28) S. Stapf, K. J. Packer, S. Békri, P. M. Adler, Two-dimensional NMR measurements and numerical simulations of fluid transport in porous rocks,  Phys. Fluids 12, 566-580 (2000).


(27) S. Stapf, K. J. Packer, Two-dimensional propagators and spatio-temporal correlations for flow in porous solids: a comparative study,  Appl.Magn. Reson. 15, 303-322 (1998).

(26) S. Stapf, R. A. Damion, K. J. Packer, Time correlations in fluid transport obtained by sequential rephasing gradient pulses,  J. Magn. Reson. 137, 316-323 (1999).


(25) S. Stapf, K. J. Packer, R. G. Graham, J.-F. Thovert, P. M. Adler, Spatial correlations and dispersion for fluid transport through packed glass beads,  Phys. Rev. E  58, 6206-6221 (1998).

(24) I. Ardelean, R. Kimmich, S. Stapf, D. E. Demco, The nonlinear stimulated echo in the presence of inequivalent spins,  J. Magn. Reson. 132, 138-143 (1998).

(23) K. J. Packer, S. Stapf, J. J. Tessier, R. A. Damion, The characterisation of fluid transport in porous solids by means of pulsed magnetic field gradient NMR,  Magn. Reson. Imaging 16, 463-469 (1998).

(22) F. Grinberg, R. Kimmich, S. Stapf, Molecular dynamics and order of microconfined liquid crystals,  Magn. Reson. Imaging 16, 635-637 (1998).

(21) T. Zavada, S. Stapf, R. Kimmich, Diffusion and relaxation in interface layers of crystals in nanoporous materials,  Magn. Reson. Imaging 16, 695-697 (1998).

(20) T. Zavada, S. Stapf, U. Beginn, R. Kimmich,  Field-cycling proton NMR relaxometry of molecules undergoing Lévy walks at the surface of fine particles and porous glass,  Magn. Reson. Imaging  16, 711-713 (1998). 


(19) S. Stapf, R. Kimmich, Translational mobility in surface induced liquid layers investigated by NMR diffusometry,  Chem. Phys. Lett. 275,261-268 (1997).

(18) S. Stapf, R. Kimmich, Translational versus rotational molecular dynamics in plastic crystals studied by NMR relaxometry and diffusometry,  Molec. Phys. 92, 1051-1060 (1997).

(17) I. Ardelean, R. Kimmich, S. Stapf, D. E. Demco, Multiple nonlinear stimulated echoes, J. Magn. Reson. 127, 217-224 (1997).

(16) R. Kimmich, T. Zavada, S. Stapf, NMR Experiments on molecular dynamics in nanoporous media: evidence for Lévy walk statistics, Mat. Res. Soc. Symp. Proc. 464, 313-324 (1997).

(15) I. Ardelean, S. Stapf, D. E. Demco, R. Kimmich,  The nonlinear stimulated echo,  J. Magn. Reson. 124, 506-508 (1997).

(14) S. Stapf, R. Kimmich, T. Zavada, Dynamics of plastic and liquid cyclohexane in bulk and in porous glasses studied by NMR methods, Appl. Magn. Reson. 12, 199-212 (1997).

(13) R. R. Valiullin, V. D. Skirda, S. Stapf, R. Kimmich,  Molecular exchange processes in partially filled porous glass as seen with NMR diffusometry,  Phys. Rev. E 55, 2664-2671 (1997).


(12) S. Stapf, R. Kimmich, R.-O. Seitter, A. I. Maklakov, V. D. Skirda,  Proton and deuteron field-cycling NMR relaxometry of liquids confined in porous glasses, Colloids Surfaces A: Physicochem. Eng. Aspects 115, 107-114 (1996).

(11) F. Grinberg, R. Kimmich, S. Stapf,  Investigation of molecular order and dynamics in liquid crystals confined in porous media using the dipolar-correlation effect of the stimulated echo, Magn. Reson. Imaging 14, 883-885 (1996).

(10) S. Stapf, R. Kimmich, R.-O. Seitter, Field-cycling NMR relaxometry of liquids confined in porous glass:evidence for Lévy-walks,  Magn. Reson. Imaging 14, 841-846 (1996).

(9)     R. Kimmich, S. Stapf, A, I. Maklakov, V. D. Skirda, E. V. Khozina, Self-diffusion in fluids in porous glass: confinement by pores and liquid adsorption layers,  Magn. Reson. Imaging 14, 793-797 (1996).

(8)     S. Stapf, R. Kimmich, Field-cycling NMR relaxometry and field-gradient NMR diffusometry of polymers confined in porous glasses: evidence for a restricted-geometry effect,  Macromolecules  29, 1638-1641 (1996).


(7)     S. Stapf, R. Kimmich, Molecular dynamics in confined monomolecular layers. A field-cycling nuclear magnetic resonance relaxometry study of liquids in porous glass,  J. Chem. Phys. 103, 2247-2250 (1995).

(6)      S. Stapf, R. Kimmich, R.-O. Seitter, Proton and deuteron field-cycling NMR relaxometry of liquids in porous glasses: evidence for Lévy-walk statistics,  Phys. Rev. Lett. 75, 2855-2858 (1995).

(5)     R. Kimmich, S. Stapf, R.-O. Seitter, P. T. Callaghan, E. V. Khozina, Molecular dynamics of monomer, oligomer, and polymer liquids in porous media: a field-cycling NMR relaxometry and NMR field-gradient diffusometry study, Mat. Res. Soc. Symp. Proc. 366, 189-200 (1995).


(4)     R. Kimmich, N. F. Fatkullin, H. W. Weber, S. Stapf,  Nuclear spin-lattice relaxation and theories of polymer dynamics, J. Non-Cryst. Solids 172-174, 689-697 (1994).

(3)     R. Kimmich, S. Stapf, M. Möller, R. Out, R.-O. Seitter, Field-cycling NMR relaxation spectroscopy of poly(di-n-alkylsiloxanes) in solid, mesomorphic liquid, and isotropic liquid phases,  Macromolecules 27, 1505-1508 (1994).

(2)     R. Kimmich, S. Stapf, P. T. Callaghan, A. Coy, Microstructure of porous media probed by NMR techniques in sub-micrometer length scales, Magn. Reson. Imaging 12, 339-343 (1994).

(1)     S. Stapf, R. Kimmich, J. Niess, Microstructure of porous media and field-cycling nuclear magnetic resonance relaxation spectroscopy, J. Appl. Phys. 75, 529-537 (1994).